{"id":59423,"date":"2026-01-13T20:49:03","date_gmt":"2026-01-13T12:49:03","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/59423.html"},"modified":"2026-01-13T20:49:03","modified_gmt":"2026-01-13T12:49:03","slug":"leetcode-473-%e7%81%ab%e6%9f%b4%e6%8b%bc%e6%ad%a3%e6%96%b9%e5%bd%a2-swift-%e9%a2%98%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/59423.html","title":{"rendered":"LeetCode 473 \u706b\u67f4\u62fc\u6b63\u65b9\u5f62 - Swift \u9898\u89e3"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260113124901-69663f3d006d6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260113124901-69663f3d58e3f.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u6458\u8981<\/li>\n<li>\u63cf\u8ff0<\/li>\n<li>\u9898\u89e3\u7b54\u6848<\/li>\n<li>\u9898\u89e3\u4ee3\u7801\u5206\u6790<\/li>\n<li>\n<ul>\n<li>1. \u57fa\u7840\u5224\u65ad\u548c\u9884\u5904\u7406<\/li>\n<li>2. \u56de\u6eaf\u7b97\u6cd5\u7684\u6838\u5fc3\u903b\u8f91<\/li>\n<li>3. \u4e3a\u4ec0\u4e48\u8fd9\u4e2a\u7b97\u6cd5\u80fd\u5de5\u4f5c&#xff1f;<\/li>\n<li>4. \u4f18\u5316\u6280\u5de7<\/li>\n<\/ul>\n<\/li>\n<li>\u793a\u4f8b\u6d4b\u8bd5\u53ca\u7ed3\u679c<\/li>\n<li>\n<ul>\n<li>\u793a\u4f8b 1&#xff1a;matchsticks &#061; [1,1,2,2,2]<\/li>\n<li>\u793a\u4f8b 2&#xff1a;matchsticks &#061; [3,3,3,3,4]<\/li>\n<li>\u793a\u4f8b 3&#xff1a;matchsticks &#061; [5,5,5,5,4,4,4,4,3,3,3,3]<\/li>\n<\/ul>\n<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6<\/li>\n<li>\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/li>\n<li>\n<ul>\n<li>1. \u8d44\u6e90\u5206\u914d\u95ee\u9898<\/li>\n<li>2. \u5bb9\u5668\u88c5\u7bb1\u95ee\u9898<\/li>\n<li>3. \u4efb\u52a1\u8c03\u5ea6\u95ee\u9898<\/li>\n<li>4. \u6e38\u620f\u5f00\u53d1\u4e2d\u7684\u5e94\u7528<\/li>\n<\/ul>\n<\/li>\n<li>\u603b\u7ed3<\/li>\n<li>\u5b8c\u6574\u53ef\u8fd0\u884c Demo \u4ee3\u7801<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u6458\u8981<\/h3>\n<p>\u8fd9\u9053\u9898\u5176\u5b9e\u633a\u6709\u610f\u601d\u7684&#xff0c;\u5b83\u8ba9\u6211\u4eec\u7528\u4e00\u5806\u957f\u5ea6\u4e0d\u540c\u7684\u706b\u67f4\u68d2&#xff0c;\u770b\u770b\u80fd\u4e0d\u80fd\u62fc\u6210\u4e00\u4e2a\u5b8c\u6574\u7684\u6b63\u65b9\u5f62\u3002\u542c\u8d77\u6765\u7b80\u5355&#xff0c;\u4f46\u5b9e\u9645\u505a\u8d77\u6765\u8fd8\u662f\u9700\u8981\u4e00\u4e9b\u6280\u5de7\u7684\u3002\u6211\u4eec\u9700\u8981\u7528\u56de\u6eaf\u7b97\u6cd5&#xff0c;\u5c1d\u8bd5\u628a\u6bcf\u6839\u706b\u67f4\u653e\u5230\u6b63\u65b9\u5f62\u7684\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761&#xff0c;\u770b\u770b\u80fd\u4e0d\u80fd\u6b63\u597d\u586b\u6ee1\u3002\u4eca\u5929\u6211\u4eec\u5c31\u7528 Swift \u6765\u641e\u5b9a\u8fd9\u9053\u9898&#xff0c;\u987a\u4fbf\u804a\u804a\u5b83\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u80fd\u7528\u5230\u54ea\u4e9b\u573a\u666f\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260113124901-69663f3d7b81b.png\" alt=\"\" \/><\/p>\n<h3>\u63cf\u8ff0<\/h3>\n<p>\u9898\u76ee\u8981\u6c42\u5f88\u7b80\u5355&#xff1a;\u7ed9\u4f60\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 matchsticks&#xff0c;\u5176\u4e2d matchsticks[i] \u662f\u7b2c i \u4e2a\u706b\u67f4\u68d2\u7684\u957f\u5ea6\u3002\u4f60\u8981\u7528\u6240\u6709\u7684\u706b\u67f4\u68cd\u62fc\u6210\u4e00\u4e2a\u6b63\u65b9\u5f62\u3002\u4f60\u4e0d\u80fd\u6298\u65ad\u4efb\u4f55\u4e00\u6839\u706b\u67f4\u68d2&#xff0c;\u4f46\u4f60\u53ef\u4ee5\u628a\u5b83\u4eec\u8fde\u5728\u4e00\u8d77&#xff0c;\u800c\u4e14\u6bcf\u6839\u706b\u67f4\u68d2\u5fc5\u987b\u4f7f\u7528\u4e00\u6b21\u3002<\/p>\n<p>\u5982\u679c\u4f60\u80fd\u4f7f\u8fd9\u4e2a\u6b63\u65b9\u5f62&#xff0c;\u5219\u8fd4\u56de true&#xff0c;\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n<p>\u793a\u4f8b 1&#xff1a;<\/p>\n<p>\u8f93\u5165: matchsticks &#061; [1,1,2,2,2]<br \/>\n\u8f93\u51fa: true<br \/>\n\u89e3\u91ca: \u80fd\u62fc\u6210\u4e00\u4e2a\u8fb9\u957f\u4e3a2\u7684\u6b63\u65b9\u5f62&#xff0c;\u6bcf\u8fb9\u4e24\u6839\u706b\u67f4\u3002<\/p>\n<p>\u793a\u4f8b 2&#xff1a;<\/p>\n<p>\u8f93\u5165: matchsticks &#061; [3,3,3,3,4]<br \/>\n\u8f93\u51fa: false<br \/>\n\u89e3\u91ca: \u4e0d\u80fd\u7528\u6240\u6709\u706b\u67f4\u62fc\u6210\u4e00\u4e2a\u6b63\u65b9\u5f62\u3002<\/p>\n<p>\u63d0\u793a&#xff1a;<\/p>\n<ul>\n<li>1 &lt;&#061; matchsticks.length &lt;&#061; 15<\/li>\n<li>1 &lt;&#061; matchsticks[i] &lt;&#061; 108<\/li>\n<\/ul>\n<p>\u8fd9\u9053\u9898\u7684\u6838\u5fc3\u601d\u8def\u662f\u4ec0\u4e48\u5462&#xff1f;\u9996\u5148&#xff0c;\u6211\u4eec\u8981\u77e5\u9053&#xff0c;\u5982\u679c\u6240\u6709\u706b\u67f4\u7684\u603b\u957f\u5ea6\u4e0d\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u90a3\u80af\u5b9a\u62fc\u4e0d\u6210\u6b63\u65b9\u5f62&#xff0c;\u76f4\u63a5\u8fd4\u56de false\u3002\u7136\u540e&#xff0c;\u6211\u4eec\u9700\u8981\u628a\u706b\u67f4\u5206\u914d\u5230\u56db\u6761\u8fb9\u4e0a&#xff0c;\u6bcf\u6761\u8fb9\u7684\u957f\u5ea6\u5e94\u8be5\u7b49\u4e8e\u603b\u957f\u5ea6\u9664\u4ee5 4\u3002\u63a5\u4e0b\u6765\u5c31\u662f\u56de\u6eaf\u7b97\u6cd5\u767b\u573a\u4e86&#xff0c;\u6211\u4eec\u5c1d\u8bd5\u628a\u6bcf\u6839\u706b\u67f4\u653e\u5230\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761&#xff0c;\u5982\u679c\u67d0\u6761\u8fb9\u8d85\u8fc7\u4e86\u76ee\u6807\u957f\u5ea6&#xff0c;\u5c31\u526a\u679d&#xff0c;\u5982\u679c\u6240\u6709\u706b\u67f4\u90fd\u5206\u914d\u5b8c\u4e86&#xff0c;\u800c\u4e14\u6bcf\u6761\u8fb9\u90fd\u6b63\u597d\u7b49\u4e8e\u76ee\u6807\u957f\u5ea6&#xff0c;\u90a3\u5c31\u8fd4\u56de true\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/01\/20260113124902-69663f3e54cf2.png\" alt=\"\" \/><\/p>\n<h3>\u9898\u89e3\u7b54\u6848<\/h3>\n<p>\u4e0b\u9762\u662f\u5b8c\u6574\u7684 Swift \u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">makesquare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> matchsticks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8ba1\u7b97\u6240\u6709\u706b\u67f4\u7684\u603b\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> totalLength <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#043;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5982\u679c\u603b\u957f\u5ea6\u4e0d\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u80af\u5b9a\u62fc\u4e0d\u6210\u6b63\u65b9\u5f62<\/span><br \/>\n        <span class=\"token keyword\">guard<\/span> totalLength <span class=\"token operator\">%<\/span> <span class=\"token number\">4<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8ba1\u7b97\u6bcf\u6761\u8fb9\u7684\u76ee\u6807\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> targetLength <span class=\"token operator\">&#061;<\/span> totalLength <span class=\"token operator\">\/<\/span> <span class=\"token number\">4<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5982\u679c\u4efb\u4f55\u4e00\u6839\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u80af\u5b9a\u62fc\u4e0d\u6210<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">where<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token short-argument\">$0<\/span> <span class=\"token operator\">&gt;<\/span> targetLength <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5bf9\u706b\u67f4\u957f\u5ea6\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f&#xff0c;\u8fd9\u6837\u53ef\u4ee5\u66f4\u5feb\u5730\u526a\u679d<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> sortedMatchsticks <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span>by<span class=\"token punctuation\">:<\/span> <span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u56db\u6761\u8fb9\u7684\u5f53\u524d\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">var<\/span> sides <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u56de\u6eaf\u7b97\u6cd5\u5c1d\u8bd5\u5206\u914d\u706b\u67f4<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>sortedMatchsticks<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sides<span class=\"token punctuation\">,<\/span> targetLength<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u56de\u6eaf\u51fd\u6570<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> matchsticks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> index<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> sides<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">inout<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> targetLength<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5982\u679c\u6240\u6709\u706b\u67f4\u90fd\u5206\u914d\u5b8c\u4e86&#xff0c;\u68c0\u67e5\u662f\u5426\u6bcf\u6761\u8fb9\u90fd\u7b49\u4e8e\u76ee\u6807\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> index <span class=\"token operator\">&#061;&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span>count <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> sides<span class=\"token punctuation\">.<\/span>allSatisfy <span class=\"token punctuation\">{<\/span> <span class=\"token short-argument\">$0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> targetLength <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">let<\/span> currentMatchstick <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u5f53\u524d\u706b\u67f4\u653e\u5230\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">..&lt;<\/span><span class=\"token number\">4<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5982\u679c\u5f53\u524d\u8fb9\u52a0\u4e0a\u8fd9\u6839\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u8df3\u8fc7&#xff08;\u526a\u679d&#xff09;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> currentMatchstick <span class=\"token operator\">&gt;<\/span> targetLength <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5982\u679c\u5f53\u524d\u8fb9\u548c\u524d\u9762\u7684\u8fb9\u957f\u5ea6\u76f8\u540c&#xff0c;\u8df3\u8fc7&#xff08;\u907f\u514d\u91cd\u590d\u8ba1\u7b97&#xff09;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8fd9\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u4f18\u5316&#xff0c;\u56e0\u4e3a\u56db\u6761\u8fb9\u662f\u5bf9\u79f0\u7684<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> sides<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5c06\u5f53\u524d\u706b\u67f4\u653e\u5230\u7b2c i \u6761\u8fb9<\/span><br \/>\n            sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> currentMatchstick<\/p>\n<p>            <span class=\"token comment\">\/\/ \u9012\u5f52\u5c1d\u8bd5\u5206\u914d\u4e0b\u4e00\u6839\u706b\u67f4<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>matchsticks<span class=\"token punctuation\">,<\/span> index <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sides<span class=\"token punctuation\">,<\/span> targetLength<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u56de\u6eaf&#xff1a;\u64a4\u9500\u521a\u624d\u7684\u64cd\u4f5c<\/span><br \/>\n            sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">-&#061;<\/span> currentMatchstick<br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5982\u679c\u6240\u6709\u5c1d\u8bd5\u90fd\u5931\u8d25\u4e86&#xff0c;\u8fd4\u56de false<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u9898\u89e3\u4ee3\u7801\u5206\u6790<\/h3>\n<p>\u8ba9\u6211\u4eec\u4e00\u6b65\u6b65\u5206\u6790\u8fd9\u4e2a\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<h4>1. \u57fa\u7840\u5224\u65ad\u548c\u9884\u5904\u7406<\/h4>\n<p><span class=\"token keyword\">let<\/span> totalLength <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">guard<\/span> totalLength <span class=\"token operator\">%<\/span> <span class=\"token number\">4<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9996\u5148&#xff0c;\u6211\u4eec\u8ba1\u7b97\u6240\u6709\u706b\u67f4\u7684\u603b\u957f\u5ea6\u3002\u5982\u679c\u603b\u957f\u5ea6\u4e0d\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u90a3\u80af\u5b9a\u62fc\u4e0d\u6210\u6b63\u65b9\u5f62&#xff0c;\u56e0\u4e3a\u6b63\u65b9\u5f62\u7684\u56db\u6761\u8fb9\u957f\u5ea6\u5fc5\u987b\u76f8\u7b49\u3002\u8fd9\u662f\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u526a\u679d\u6761\u4ef6&#xff0c;\u53ef\u4ee5\u8ba9\u6211\u4eec\u5728\u65e9\u671f\u5c31\u6392\u9664\u6389\u5f88\u591a\u4e0d\u53ef\u80fd\u7684\u60c5\u51b5\u3002<\/p>\n<p><span class=\"token keyword\">let<\/span> targetLength <span class=\"token operator\">&#061;<\/span> totalLength <span class=\"token operator\">\/<\/span> <span class=\"token number\">4<\/span><br \/>\n<span class=\"token keyword\">if<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">where<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token short-argument\">$0<\/span> <span class=\"token operator\">&gt;<\/span> targetLength <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7136\u540e&#xff0c;\u6211\u4eec\u8ba1\u7b97\u6bcf\u6761\u8fb9\u7684\u76ee\u6807\u957f\u5ea6\u3002\u5982\u679c\u4efb\u4f55\u4e00\u6839\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u90a3\u80af\u5b9a\u62fc\u4e0d\u6210&#xff0c;\u56e0\u4e3a\u4e00\u6839\u706b\u67f4\u4e0d\u80fd\u8de8\u8d8a\u591a\u6761\u8fb9\u3002\u8fd9\u4e5f\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u526a\u679d\u6761\u4ef6\u3002<\/p>\n<p><span class=\"token keyword\">let<\/span> sortedMatchsticks <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span>by<span class=\"token punctuation\">:<\/span> <span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u63a5\u4e0b\u6765&#xff0c;\u6211\u4eec\u5bf9\u706b\u67f4\u957f\u5ea6\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f\u3002\u4e3a\u4ec0\u4e48\u8981\u8fd9\u6837\u505a\u5462&#xff1f;\u56e0\u4e3a\u5982\u679c\u6211\u4eec\u5148\u628a\u957f\u7684\u706b\u67f4\u5206\u914d\u597d&#xff0c;\u53ef\u4ee5\u66f4\u5feb\u5730\u53d1\u73b0\u4e0d\u53ef\u80fd\u7684\u60c5\u51b5&#xff0c;\u4ece\u800c\u8fdb\u884c\u526a\u679d\u3002\u6bd4\u5982&#xff0c;\u5982\u679c\u6700\u957f\u7684\u706b\u67f4\u90fd\u653e\u4e0d\u4e0b&#xff0c;\u90a3\u540e\u9762\u7684\u77ed\u706b\u67f4\u5c31\u66f4\u4e0d\u7528\u8bf4\u4e86\u3002<\/p>\n<h4>2. \u56de\u6eaf\u7b97\u6cd5\u7684\u6838\u5fc3\u903b\u8f91<\/h4>\n<p><span class=\"token keyword\">var<\/span> sides <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>sortedMatchsticks<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sides<span class=\"token punctuation\">,<\/span> targetLength<span class=\"token punctuation\">)<\/span><\/p>\n<p>\u6211\u4eec\u7528\u4e00\u4e2a\u6570\u7ec4 sides \u6765\u8bb0\u5f55\u56db\u6761\u8fb9\u7684\u5f53\u524d\u957f\u5ea6&#xff0c;\u521d\u59cb\u503c\u90fd\u662f 0\u3002\u7136\u540e\u8c03\u7528\u56de\u6eaf\u51fd\u6570&#xff0c;\u4ece\u7b2c\u4e00\u6839\u706b\u67f4\u5f00\u59cb\u5c1d\u8bd5\u5206\u914d\u3002<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> matchsticks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> index<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> sides<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">inout<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> targetLength<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> index <span class=\"token operator\">&#061;&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span>count <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> sides<span class=\"token punctuation\">.<\/span>allSatisfy <span class=\"token punctuation\">{<\/span> <span class=\"token short-argument\">$0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> targetLength <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u56de\u6eaf\u51fd\u6570\u7684\u6838\u5fc3\u903b\u8f91\u662f&#xff1a;\u5982\u679c\u6240\u6709\u706b\u67f4\u90fd\u5206\u914d\u5b8c\u4e86&#xff0c;\u68c0\u67e5\u662f\u5426\u6bcf\u6761\u8fb9\u90fd\u7b49\u4e8e\u76ee\u6807\u957f\u5ea6\u3002\u5982\u679c\u90fd\u76f8\u7b49&#xff0c;\u8fd4\u56de true&#xff0c;\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n<p><span class=\"token keyword\">let<\/span> currentMatchstick <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">..&lt;<\/span><span class=\"token number\">4<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> currentMatchstick <span class=\"token operator\">&gt;<\/span> targetLength <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">continue<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7136\u540e&#xff0c;\u6211\u4eec\u5c1d\u8bd5\u5c06\u5f53\u524d\u706b\u67f4\u653e\u5230\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761\u3002\u5982\u679c\u67d0\u6761\u8fb9\u52a0\u4e0a\u5f53\u524d\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u5c31\u8df3\u8fc7\u8fd9\u6761\u8fb9&#xff0c;\u56e0\u4e3a\u8fd9\u6837\u80af\u5b9a\u62fc\u4e0d\u6210\u3002<\/p>\n<p><span class=\"token keyword\">if<\/span> i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> sides<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">continue<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u4f18\u5316\u3002\u5982\u679c\u5f53\u524d\u8fb9\u548c\u524d\u9762\u7684\u8fb9\u957f\u5ea6\u76f8\u540c&#xff0c;\u6211\u4eec\u8df3\u8fc7\u8fd9\u6761\u8fb9&#xff0c;\u56e0\u4e3a\u56db\u6761\u8fb9\u662f\u5bf9\u79f0\u7684&#xff0c;\u5982\u679c\u524d\u9762\u7684\u8fb9\u5df2\u7ecf\u5c1d\u8bd5\u8fc7\u4e86&#xff0c;\u5f53\u524d\u8fb9\u5c31\u4e0d\u7528\u518d\u8bd5\u4e86\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u8ba1\u7b97&#xff0c;\u5927\u5927\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<p>sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> currentMatchstick<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>matchsticks<span class=\"token punctuation\">,<\/span> index <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sides<span class=\"token punctuation\">,<\/span> targetLength<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">-&#061;<\/span> currentMatchstick<\/p>\n<p>\u63a5\u4e0b\u6765&#xff0c;\u6211\u4eec\u5c06\u5f53\u524d\u706b\u67f4\u653e\u5230\u7b2c i \u6761\u8fb9&#xff0c;\u7136\u540e\u9012\u5f52\u5c1d\u8bd5\u5206\u914d\u4e0b\u4e00\u6839\u706b\u67f4\u3002\u5982\u679c\u9012\u5f52\u8fd4\u56de true&#xff0c;\u8bf4\u660e\u627e\u5230\u4e86\u89e3\u51b3\u65b9\u6848&#xff0c;\u76f4\u63a5\u8fd4\u56de true\u3002\u5426\u5219&#xff0c;\u6211\u4eec\u64a4\u9500\u521a\u624d\u7684\u64cd\u4f5c&#xff08;\u56de\u6eaf&#xff09;&#xff0c;\u5c1d\u8bd5\u4e0b\u4e00\u6761\u8fb9\u3002<\/p>\n<h4>3. \u4e3a\u4ec0\u4e48\u8fd9\u4e2a\u7b97\u6cd5\u80fd\u5de5\u4f5c&#xff1f;<\/h4>\n<p>\u56de\u6eaf\u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u662f&#xff1a;\u5c1d\u8bd5\u6240\u6709\u53ef\u80fd\u7684\u5206\u914d\u65b9\u5f0f&#xff0c;\u5982\u679c\u67d0\u6761\u8def\u5f84\u8d70\u4e0d\u901a&#xff0c;\u5c31\u56de\u9000\u5230\u4e0a\u4e00\u6b65&#xff0c;\u5c1d\u8bd5\u5176\u4ed6\u8def\u5f84\u3002\u5728\u8fd9\u4e2a\u95ee\u9898\u4e2d&#xff0c;\u6211\u4eec\u5c1d\u8bd5\u628a\u6bcf\u6839\u706b\u67f4\u653e\u5230\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761&#xff0c;\u5982\u679c\u67d0\u6761\u8def\u5f84\u80fd\u6210\u529f\u5206\u914d\u6240\u6709\u706b\u67f4&#xff0c;\u5c31\u8fd4\u56de true&#xff0c;\u5426\u5219\u7ee7\u7eed\u5c1d\u8bd5\u5176\u4ed6\u8def\u5f84\u3002<\/p>\n<h4>4. \u4f18\u5316\u6280\u5de7<\/h4>\n<li>\u964d\u5e8f\u6392\u5e8f&#xff1a;\u5148\u628a\u957f\u7684\u706b\u67f4\u5206\u914d\u597d&#xff0c;\u53ef\u4ee5\u66f4\u5feb\u5730\u53d1\u73b0\u4e0d\u53ef\u80fd\u7684\u60c5\u51b5\u3002<\/li>\n<li>\u526a\u679d&#xff1a;\u5982\u679c\u67d0\u6761\u8fb9\u52a0\u4e0a\u5f53\u524d\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u76f4\u63a5\u8df3\u8fc7\u3002<\/li>\n<li>\u907f\u514d\u91cd\u590d\u8ba1\u7b97&#xff1a;\u5982\u679c\u5f53\u524d\u8fb9\u548c\u524d\u9762\u7684\u8fb9\u957f\u5ea6\u76f8\u540c&#xff0c;\u8df3\u8fc7\u5f53\u524d\u8fb9&#xff0c;\u56e0\u4e3a\u56db\u6761\u8fb9\u662f\u5bf9\u79f0\u7684\u3002<\/li>\n<h3>\u793a\u4f8b\u6d4b\u8bd5\u53ca\u7ed3\u679c<\/h3>\n<p>\u8ba9\u6211\u4eec\u7528\u51e0\u4e2a\u4f8b\u5b50\u6765\u6d4b\u8bd5\u4e00\u4e0b\u8fd9\u4e2a\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<h4>\u793a\u4f8b 1&#xff1a;matchsticks &#061; [1,1,2,2,2]<\/h4>\n<p><span class=\"token keyword\">let<\/span> solution <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Solution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">let<\/span> result1 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u793a\u4f8b 1 \u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result1<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa: true<\/span><\/p>\n<p>\u6267\u884c\u8fc7\u7a0b\u5206\u6790&#xff1a;<\/p>\n<li>\u603b\u957f\u5ea6 &#061; 1 &#043; 1 &#043; 2 &#043; 2 &#043; 2 &#061; 8&#xff0c;\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u76ee\u6807\u957f\u5ea6 &#061; 2<\/li>\n<li>\u6392\u5e8f\u540e&#xff1a;[2, 2, 2, 1, 1]<\/li>\n<li>\u5206\u914d\u8fc7\u7a0b&#xff1a;\n<ul>\n<li>\u7b2c\u4e00\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 2&#xff09;\u653e\u5230\u8fb9 0&#xff1a;sides &#061; [2, 0, 0, 0]<\/li>\n<li>\u7b2c\u4e8c\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 2&#xff09;\u653e\u5230\u8fb9 1&#xff1a;sides &#061; [2, 2, 0, 0]<\/li>\n<li>\u7b2c\u4e09\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 2&#xff09;\u653e\u5230\u8fb9 2&#xff1a;sides &#061; [2, 2, 2, 0]<\/li>\n<li>\u7b2c\u56db\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 1&#xff09;\u653e\u5230\u8fb9 0&#xff1a;sides &#061; [3, 2, 2, 0]&#xff08;\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u56de\u6eaf&#xff09;<\/li>\n<li>\u7b2c\u56db\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 1&#xff09;\u653e\u5230\u8fb9 1&#xff1a;sides &#061; [2, 3, 2, 0]&#xff08;\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u56de\u6eaf&#xff09;<\/li>\n<li>\u7b2c\u56db\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 1&#xff09;\u653e\u5230\u8fb9 2&#xff1a;sides &#061; [2, 2, 3, 0]&#xff08;\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u56de\u6eaf&#xff09;<\/li>\n<li>\u7b2c\u56db\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 1&#xff09;\u653e\u5230\u8fb9 3&#xff1a;sides &#061; [2, 2, 2, 1]<\/li>\n<li>\u7b2c\u4e94\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 1&#xff09;\u653e\u5230\u8fb9 3&#xff1a;sides &#061; [2, 2, 2, 2]<\/li>\n<li>\u6240\u6709\u706b\u67f4\u5206\u914d\u5b8c\u6210&#xff0c;\u6bcf\u6761\u8fb9\u90fd\u7b49\u4e8e\u76ee\u6807\u957f\u5ea6 2&#xff0c;\u8fd4\u56de true<\/li>\n<\/ul>\n<\/li>\n<h4>\u793a\u4f8b 2&#xff1a;matchsticks &#061; [3,3,3,3,4]<\/h4>\n<p><span class=\"token keyword\">let<\/span> result2 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u793a\u4f8b 2 \u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result2<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa: false<\/span><\/p>\n<p>\u6267\u884c\u8fc7\u7a0b\u5206\u6790&#xff1a;<\/p>\n<li>\u603b\u957f\u5ea6 &#061; 3 &#043; 3 &#043; 3 &#043; 3 &#043; 4 &#061; 16&#xff0c;\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u76ee\u6807\u957f\u5ea6 &#061; 4<\/li>\n<li>\u6392\u5e8f\u540e&#xff1a;[4, 3, 3, 3, 3]<\/li>\n<li>\u5206\u914d\u8fc7\u7a0b&#xff1a;\n<ul>\n<li>\u7b2c\u4e00\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 4&#xff09;\u653e\u5230\u8fb9 0&#xff1a;sides &#061; [4, 0, 0, 0]<\/li>\n<li>\u7b2c\u4e8c\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 3&#xff09;\u653e\u5230\u8fb9 1&#xff1a;sides &#061; [4, 3, 0, 0]<\/li>\n<li>\u7b2c\u4e09\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 3&#xff09;\u653e\u5230\u8fb9 2&#xff1a;sides &#061; [4, 3, 3, 0]<\/li>\n<li>\u7b2c\u56db\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 3&#xff09;\u653e\u5230\u8fb9 3&#xff1a;sides &#061; [4, 3, 3, 3]<\/li>\n<li>\u7b2c\u4e94\u6839\u706b\u67f4&#xff08;\u957f\u5ea6 3&#xff09;\u65e0\u6cd5\u653e\u5230\u4efb\u4f55\u4e00\u6761\u8fb9&#xff08;\u56e0\u4e3a\u6bcf\u6761\u8fb9\u52a0\u4e0a 3 \u90fd\u4f1a\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6 4&#xff09;<\/li>\n<li>\u56de\u6eaf\u5c1d\u8bd5\u5176\u4ed6\u5206\u914d\u65b9\u5f0f&#xff0c;\u4f46\u90fd\u65e0\u6cd5\u6210\u529f&#xff0c;\u8fd4\u56de false<\/li>\n<\/ul>\n<\/li>\n<h4>\u793a\u4f8b 3&#xff1a;matchsticks &#061; [5,5,5,5,4,4,4,4,3,3,3,3]<\/h4>\n<p><span class=\"token keyword\">let<\/span> result3 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u793a\u4f8b 3 \u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result3<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa: true<\/span><\/p>\n<p>\u6267\u884c\u8fc7\u7a0b\u5206\u6790&#xff1a;<\/p>\n<li>\u603b\u957f\u5ea6 &#061; 5\u00d74 &#043; 4\u00d74 &#043; 3\u00d74 &#061; 20 &#043; 16 &#043; 12 &#061; 48&#xff0c;\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u76ee\u6807\u957f\u5ea6 &#061; 12<\/li>\n<li>\u6392\u5e8f\u540e&#xff1a;[5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3]<\/li>\n<li>\u53ef\u4ee5\u6210\u529f\u5206\u914d&#xff0c;\u6bd4\u5982&#xff1a;\n<ul>\n<li>\u8fb9 0&#xff1a;5 &#043; 4 &#043; 3 &#061; 12<\/li>\n<li>\u8fb9 1&#xff1a;5 &#043; 4 &#043; 3 &#061; 12<\/li>\n<li>\u8fb9 2&#xff1a;5 &#043; 4 &#043; 3 &#061; 12<\/li>\n<li>\u8fb9 3&#xff1a;5 &#043; 4 &#043; 3 &#061; 12<\/li>\n<li>\u8fd4\u56de true<\/li>\n<\/ul>\n<\/li>\n<h3>\u65f6\u95f4\u590d\u6742\u5ea6<\/h3>\n<p>\u8fd9\u4e2a\u7b97\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3b\u8981\u53d6\u51b3\u4e8e\u56de\u6eaf\u8fc7\u7a0b\u4e2d\u5c1d\u8bd5\u7684\u6b21\u6570\u3002\u6700\u574f\u60c5\u51b5\u4e0b&#xff0c;\u6211\u4eec\u9700\u8981\u5c1d\u8bd5\u6240\u6709\u53ef\u80fd\u7684\u5206\u914d\u65b9\u5f0f\u3002<\/p>\n<ul>\n<li>\u6700\u574f\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;O(4^n)&#xff0c;\u5176\u4e2d n \u662f\u706b\u67f4\u7684\u6570\u91cf\u3002\u56e0\u4e3a\u6bcf\u6839\u706b\u67f4\u90fd\u6709 4 \u79cd\u9009\u62e9&#xff08;\u653e\u5230\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761&#xff09;&#xff0c;\u6240\u4ee5\u603b\u5171\u6709 4^n \u79cd\u53ef\u80fd\u7684\u5206\u914d\u65b9\u5f0f\u3002<\/li>\n<li>\u5b9e\u9645\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;\u7531\u4e8e\u6211\u4eec\u4f7f\u7528\u4e86\u526a\u679d\u548c\u4f18\u5316\u6280\u5de7&#xff08;\u964d\u5e8f\u6392\u5e8f\u3001\u907f\u514d\u91cd\u590d\u8ba1\u7b97&#xff09;&#xff0c;\u5b9e\u9645\u8fd0\u884c\u65f6\u95f4\u4f1a\u5927\u5927\u51cf\u5c11\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6\u4f1a\u8fdc\u5c0f\u4e8e O(4^n)\u3002<\/li>\n<\/ul>\n<h3>\u7a7a\u95f4\u590d\u6742\u5ea6<\/h3>\n<ul>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;O(n)&#xff0c;\u5176\u4e2d n \u662f\u706b\u67f4\u7684\u6570\u91cf\u3002\u4e3b\u8981\u7a7a\u95f4\u6d88\u8017\u6765\u81ea&#xff1a;\n<li>\u9012\u5f52\u8c03\u7528\u6808\u7684\u6df1\u5ea6&#xff0c;\u6700\u591a\u4e3a n&#xff08;\u6bcf\u6839\u706b\u67f4\u5bf9\u5e94\u4e00\u5c42\u9012\u5f52&#xff09;<\/li>\n<li>sides \u6570\u7ec4&#xff0c;\u56fa\u5b9a\u5927\u5c0f\u4e3a 4<\/li>\n<li>\u6392\u5e8f\u540e\u7684\u6570\u7ec4&#xff0c;\u5927\u5c0f\u4e3a n<\/li>\n<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u9898\u76ee\u4e2d matchsticks.length &lt;&#061; 15&#xff0c;\u6240\u4ee5\u7a7a\u95f4\u590d\u6742\u5ea6\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002<\/p>\n<h3>\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n<p>\u8fd9\u9053\u9898\u867d\u7136\u770b\u8d77\u6765\u50cf\u662f\u4e00\u4e2a\u7eaf\u7cb9\u7684\u7b97\u6cd5\u9898&#xff0c;\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d&#xff0c;\u7c7b\u4f3c\u7684\u601d\u8def\u8fd8\u662f\u5f88\u6709\u7528\u7684&#xff1a;<\/p>\n<h4>1. \u8d44\u6e90\u5206\u914d\u95ee\u9898<\/h4>\n<p>\u6bd4\u5982&#xff0c;\u5728\u670d\u52a1\u5668\u8d44\u6e90\u5206\u914d\u4e2d&#xff0c;\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5c06\u591a\u4e2a\u4efb\u52a1\u5206\u914d\u5230\u591a\u4e2a\u670d\u52a1\u5668\u4e0a&#xff0c;\u6bcf\u4e2a\u670d\u52a1\u5668\u6709\u56fa\u5b9a\u7684\u5bb9\u91cf\u3002\u6211\u4eec\u53ef\u4ee5\u7528\u7c7b\u4f3c\u7684\u56de\u6eaf\u7b97\u6cd5\u6765\u627e\u5230\u6700\u4f18\u7684\u5206\u914d\u65b9\u6848\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f2a\u4ee3\u7801\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">allocateTasks<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> tasks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Task<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> servers<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Server<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7c7b\u4f3c\u706b\u67f4\u62fc\u6b63\u65b9\u5f62\u7684\u601d\u8def<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u4efb\u52a1\u5206\u914d\u5230\u670d\u52a1\u5668\u4e0a<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5982\u679c\u67d0\u4e2a\u670d\u52a1\u5668\u7684\u8d1f\u8f7d\u8d85\u8fc7\u5bb9\u91cf&#xff0c;\u56de\u6eaf\u5c1d\u8bd5\u5176\u4ed6\u5206\u914d\u65b9\u5f0f<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. \u5bb9\u5668\u88c5\u7bb1\u95ee\u9898<\/h4>\n<p>\u5728\u7269\u6d41\u7cfb\u7edf\u4e2d&#xff0c;\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5c06\u591a\u4e2a\u7269\u54c1\u88c5\u5230\u591a\u4e2a\u5bb9\u5668\u4e2d&#xff0c;\u6bcf\u4e2a\u5bb9\u5668\u6709\u56fa\u5b9a\u7684\u5bb9\u91cf\u3002\u6211\u4eec\u53ef\u4ee5\u7528\u7c7b\u4f3c\u7684\u56de\u6eaf\u7b97\u6cd5\u6765\u627e\u5230\u6700\u4f18\u7684\u88c5\u7bb1\u65b9\u6848\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f2a\u4ee3\u7801\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">packItems<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> items<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Item<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> containers<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Container<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7c7b\u4f3c\u706b\u67f4\u62fc\u6b63\u65b9\u5f62\u7684\u601d\u8def<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u7269\u54c1\u88c5\u5230\u5bb9\u5668\u4e2d<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5982\u679c\u67d0\u4e2a\u5bb9\u5668\u7684\u5bb9\u91cf\u8d85\u8fc7\u9650\u5236&#xff0c;\u56de\u6eaf\u5c1d\u8bd5\u5176\u4ed6\u88c5\u7bb1\u65b9\u5f0f<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u4efb\u52a1\u8c03\u5ea6\u95ee\u9898<\/h4>\n<p>\u5728\u4efb\u52a1\u8c03\u5ea6\u7cfb\u7edf\u4e2d&#xff0c;\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5c06\u591a\u4e2a\u4efb\u52a1\u5206\u914d\u5230\u591a\u4e2a\u5904\u7406\u5668\u4e0a&#xff0c;\u6bcf\u4e2a\u5904\u7406\u5668\u6709\u56fa\u5b9a\u7684\u5904\u7406\u80fd\u529b\u3002\u6211\u4eec\u53ef\u4ee5\u7528\u7c7b\u4f3c\u7684\u56de\u6eaf\u7b97\u6cd5\u6765\u627e\u5230\u6700\u4f18\u7684\u8c03\u5ea6\u65b9\u6848\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f2a\u4ee3\u7801\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">scheduleTasks<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> tasks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Task<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> processors<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Processor<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7c7b\u4f3c\u706b\u67f4\u62fc\u6b63\u65b9\u5f62\u7684\u601d\u8def<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u4efb\u52a1\u5206\u914d\u5230\u5904\u7406\u5668\u4e0a<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5982\u679c\u67d0\u4e2a\u5904\u7406\u5668\u7684\u8d1f\u8f7d\u8d85\u8fc7\u80fd\u529b&#xff0c;\u56de\u6eaf\u5c1d\u8bd5\u5176\u4ed6\u8c03\u5ea6\u65b9\u5f0f<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4. \u6e38\u620f\u5f00\u53d1\u4e2d\u7684\u5e94\u7528<\/h4>\n<p>\u5728\u4e00\u4e9b\u62fc\u56fe\u7c7b\u6e38\u620f\u4e2d&#xff0c;\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5c06\u591a\u4e2a\u62fc\u56fe\u5757\u62fc\u6210\u4e00\u4e2a\u5b8c\u6574\u7684\u56fe\u5f62\u3002\u6211\u4eec\u53ef\u4ee5\u7528\u7c7b\u4f3c\u7684\u56de\u6eaf\u7b97\u6cd5\u6765\u68c0\u67e5\u73a9\u5bb6\u662f\u5426\u80fd\u591f\u5b8c\u6210\u62fc\u56fe\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f2a\u4ee3\u7801\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">canCompletePuzzle<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> pieces<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PuzzlePiece<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> targetShape<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Shape<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u7c7b\u4f3c\u706b\u67f4\u62fc\u6b63\u65b9\u5f62\u7684\u601d\u8def<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u62fc\u56fe\u5757\u653e\u5230\u76ee\u6807\u56fe\u5f62\u7684\u4e0d\u540c\u4f4d\u7f6e<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5982\u679c\u67d0\u4e2a\u4f4d\u7f6e\u653e\u4e0d\u4e0b&#xff0c;\u56de\u6eaf\u5c1d\u8bd5\u5176\u4ed6\u4f4d\u7f6e<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u8fd9\u9053\u9898\u5176\u5b9e\u633a\u6709\u4ee3\u8868\u6027\u7684&#xff0c;\u5b83\u5c55\u793a\u4e86\u56de\u6eaf\u7b97\u6cd5\u5728\u89e3\u51b3\u7ec4\u5408\u4f18\u5316\u95ee\u9898\u4e2d\u7684\u5f3a\u5927\u5a01\u529b\u3002\u901a\u8fc7\u5408\u7406\u7684\u526a\u679d\u548c\u4f18\u5316&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u7b97\u6cd5\u7684\u6548\u7387\u3002<\/p>\n<p>\u5173\u952e\u70b9\u603b\u7ed3&#xff1a;<\/p>\n<li>\n<p>\u57fa\u7840\u5224\u65ad\u5f88\u91cd\u8981&#xff1a;\u5728\u5f00\u59cb\u56de\u6eaf\u4e4b\u524d&#xff0c;\u5148\u68c0\u67e5\u4e00\u4e9b\u660e\u663e\u4e0d\u53ef\u80fd\u7684\u60c5\u51b5&#xff08;\u6bd4\u5982\u603b\u957f\u5ea6\u4e0d\u80fd\u88ab 4 \u6574\u9664\u3001\u6709\u706b\u67f4\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6\u7b49&#xff09;&#xff0c;\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u8ba1\u7b97\u3002<\/p>\n<\/li>\n<li>\n<p>\u6392\u5e8f\u4f18\u5316&#xff1a;\u5bf9\u706b\u67f4\u957f\u5ea6\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f&#xff0c;\u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u5feb\u5730\u53d1\u73b0\u4e0d\u53ef\u80fd\u7684\u60c5\u51b5&#xff0c;\u4ece\u800c\u8fdb\u884c\u526a\u679d\u3002<\/p>\n<\/li>\n<li>\n<p>\u907f\u514d\u91cd\u590d\u8ba1\u7b97&#xff1a;\u5229\u7528\u5bf9\u79f0\u6027&#xff08;\u56db\u6761\u8fb9\u662f\u5bf9\u79f0\u7684&#xff09;&#xff0c;\u907f\u514d\u91cd\u590d\u8ba1\u7b97\u76f8\u540c\u7684\u5206\u914d\u65b9\u5f0f\u3002<\/p>\n<\/li>\n<li>\n<p>\u56de\u6eaf\u7684\u6838\u5fc3&#xff1a;\u5c1d\u8bd5\u6240\u6709\u53ef\u80fd\u7684\u5206\u914d\u65b9\u5f0f&#xff0c;\u5982\u679c\u67d0\u6761\u8def\u5f84\u8d70\u4e0d\u901a&#xff0c;\u5c31\u56de\u9000\u5230\u4e0a\u4e00\u6b65&#xff0c;\u5c1d\u8bd5\u5176\u4ed6\u8def\u5f84\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b9e\u9645\u5e94\u7528&#xff1a;\u7c7b\u4f3c\u7684\u601d\u8def\u5728\u8d44\u6e90\u5206\u914d\u3001\u5bb9\u5668\u88c5\u7bb1\u3001\u4efb\u52a1\u8c03\u5ea6\u7b49\u95ee\u9898\u4e2d\u90fd\u6709\u5e94\u7528\u3002<\/p>\n<\/li>\n<p>\u867d\u7136\u8fd9\u9053\u9898\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5728\u6700\u574f\u60c5\u51b5\u4e0b\u662f\u6307\u6570\u7ea7\u7684&#xff0c;\u4f46\u7531\u4e8e\u9898\u76ee\u4e2d matchsticks.length &lt;&#061; 15&#xff0c;\u800c\u4e14\u6211\u4eec\u4f7f\u7528\u4e86\u591a\u79cd\u4f18\u5316\u6280\u5de7&#xff0c;\u5b9e\u9645\u8fd0\u884c\u65f6\u95f4\u8fd8\u662f\u53ef\u4ee5\u63a5\u53d7\u7684\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d&#xff0c;\u5982\u679c\u9047\u5230\u7c7b\u4f3c\u7684\u95ee\u9898&#xff0c;\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u60c5\u51b5\u8c03\u6574\u7b97\u6cd5&#xff0c;\u6bd4\u5982\u4f7f\u7528\u52a8\u6001\u89c4\u5212\u3001\u8d2a\u5fc3\u7b97\u6cd5\u7b49\u5176\u4ed6\u65b9\u6cd5\u3002<\/p>\n<p>\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u5e2e\u52a9\u4f60\u7406\u89e3\u56de\u6eaf\u7b97\u6cd5&#xff0c;\u4ee5\u53ca\u5982\u4f55\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u5e94\u7528\u7c7b\u4f3c\u7684\u601d\u8def\u3002\u5982\u679c\u4f60\u6709\u4ec0\u4e48\u95ee\u9898\u6216\u5efa\u8bae&#xff0c;\u6b22\u8fce\u7559\u8a00\u8ba8\u8bba&#xff01;<\/p>\n<h3>\u5b8c\u6574\u53ef\u8fd0\u884c Demo \u4ee3\u7801<\/h3>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u53ef\u8fd0\u884c\u793a\u4f8b&#xff0c;\u5305\u542b\u4e86\u6d4b\u8bd5\u7528\u4f8b\u548c\u8be6\u7ec6\u7684\u8f93\u51fa&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token class-name\">Foundation<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">makesquare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> matchsticks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8ba1\u7b97\u6240\u6709\u706b\u67f4\u7684\u603b\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> totalLength <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&#043;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5982\u679c\u603b\u957f\u5ea6\u4e0d\u80fd\u88ab 4 \u6574\u9664&#xff0c;\u80af\u5b9a\u62fc\u4e0d\u6210\u6b63\u65b9\u5f62<\/span><br \/>\n        <span class=\"token keyword\">guard<\/span> totalLength <span class=\"token operator\">%<\/span> <span class=\"token number\">4<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8ba1\u7b97\u6bcf\u6761\u8fb9\u7684\u76ee\u6807\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> targetLength <span class=\"token operator\">&#061;<\/span> totalLength <span class=\"token operator\">\/<\/span> <span class=\"token number\">4<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5982\u679c\u4efb\u4f55\u4e00\u6839\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u80af\u5b9a\u62fc\u4e0d\u6210<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">where<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token short-argument\">$0<\/span> <span class=\"token operator\">&gt;<\/span> targetLength <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5bf9\u706b\u67f4\u957f\u5ea6\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f&#xff0c;\u8fd9\u6837\u53ef\u4ee5\u66f4\u5feb\u5730\u526a\u679d<\/span><br \/>\n        <span class=\"token keyword\">let<\/span> sortedMatchsticks <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span>by<span class=\"token punctuation\">:<\/span> <span class=\"token operator\">&gt;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u56db\u6761\u8fb9\u7684\u5f53\u524d\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">var<\/span> sides <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u56de\u6eaf\u7b97\u6cd5\u5c1d\u8bd5\u5206\u914d\u706b\u67f4<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>sortedMatchsticks<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sides<span class=\"token punctuation\">,<\/span> targetLength<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u56de\u6eaf\u51fd\u6570<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">backtrack<\/span><span class=\"token punctuation\">(<\/span><span class=\"token omit keyword\">_<\/span> matchsticks<span class=\"token punctuation\">:<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> index<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> sides<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">inout<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token omit keyword\">_<\/span> targetLength<span class=\"token punctuation\">:<\/span> <span class=\"token class-name\">Int<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Bool<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5982\u679c\u6240\u6709\u706b\u67f4\u90fd\u5206\u914d\u5b8c\u4e86&#xff0c;\u68c0\u67e5\u662f\u5426\u6bcf\u6761\u8fb9\u90fd\u7b49\u4e8e\u76ee\u6807\u957f\u5ea6<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> index <span class=\"token operator\">&#061;&#061;<\/span> matchsticks<span class=\"token punctuation\">.<\/span>count <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> sides<span class=\"token punctuation\">.<\/span>allSatisfy <span class=\"token punctuation\">{<\/span> <span class=\"token short-argument\">$0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> targetLength <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">let<\/span> currentMatchstick <span class=\"token operator\">&#061;<\/span> matchsticks<span class=\"token punctuation\">[<\/span>index<span class=\"token punctuation\">]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u5f53\u524d\u706b\u67f4\u653e\u5230\u56db\u6761\u8fb9\u4e2d\u7684\u4e00\u6761<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">..&lt;<\/span><span class=\"token number\">4<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5982\u679c\u5f53\u524d\u8fb9\u52a0\u4e0a\u8fd9\u6839\u706b\u67f4\u7684\u957f\u5ea6\u8d85\u8fc7\u76ee\u6807\u957f\u5ea6&#xff0c;\u8df3\u8fc7&#xff08;\u526a\u679d&#xff09;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> currentMatchstick <span class=\"token operator\">&gt;<\/span> targetLength <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5982\u679c\u5f53\u524d\u8fb9\u548c\u524d\u9762\u7684\u8fb9\u957f\u5ea6\u76f8\u540c&#xff0c;\u8df3\u8fc7&#xff08;\u907f\u514d\u91cd\u590d\u8ba1\u7b97&#xff09;<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8fd9\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u4f18\u5316&#xff0c;\u56e0\u4e3a\u56db\u6761\u8fb9\u662f\u5bf9\u79f0\u7684<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> i <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> sides<span class=\"token punctuation\">[<\/span>i <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u5c06\u5f53\u524d\u706b\u67f4\u653e\u5230\u7b2c i \u6761\u8fb9<\/span><br \/>\n            sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> currentMatchstick<\/p>\n<p>            <span class=\"token comment\">\/\/ \u9012\u5f52\u5c1d\u8bd5\u5206\u914d\u4e0b\u4e00\u6839\u706b\u67f4<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token function\">backtrack<\/span><span class=\"token punctuation\">(<\/span>matchsticks<span class=\"token punctuation\">,<\/span> index <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>sides<span class=\"token punctuation\">,<\/span> targetLength<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u56de\u6eaf&#xff1a;\u64a4\u9500\u521a\u624d\u7684\u64cd\u4f5c<\/span><br \/>\n            sides<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">-&#061;<\/span> currentMatchstick<br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5982\u679c\u6240\u6709\u5c1d\u8bd5\u90fd\u5931\u8d25\u4e86&#xff0c;\u8fd4\u56de false<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function-definition function\">testSolution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> solution <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Solution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b 1<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> test1 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> result1 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span>test1<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528\u4f8b 1: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">test1<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result1<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u9884\u671f: true&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#8212;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b 2<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> test2 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> result2 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span>test2<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528\u4f8b 2: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">test2<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result2<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u9884\u671f: false&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#8212;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b 3<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> test3 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> result3 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span>test3<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528\u4f8b 3: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">test3<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result3<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u9884\u671f: true&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#8212;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b 4<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> test4 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">11<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">13<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">14<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">15<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> result4 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span>test4<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528\u4f8b 4: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">test4<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result4<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u9884\u671f: false&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#8212;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b 5<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> test5 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> result5 <span class=\"token operator\">&#061;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">makesquare<\/span><span class=\"token punctuation\">(<\/span>test5<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528\u4f8b 5: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">test5<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u7ed3\u679c: <\/span><span class=\"token interpolation-punctuation punctuation\">\\\\(<\/span><span class=\"token interpolation\">result5<\/span><span class=\"token interpolation-punctuation punctuation\">)<\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;\u9884\u671f: true&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string-literal\"><span class=\"token string\">&#034;&#8212;&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8fd0\u884c\u6d4b\u8bd5<\/span><br \/>\n<span class=\"token function\">testSolution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p>\u6d4b\u8bd5\u7528\u4f8b 1: [1, 1, 2, 2, 2]<br \/>\n\u7ed3\u679c: true<br \/>\n\u9884\u671f: true<br \/>\n&#8212;<br \/>\n\u6d4b\u8bd5\u7528\u4f8b 2: [3, 3, 3, 3, 4]<br \/>\n\u7ed3\u679c: false<br \/>\n\u9884\u671f: false<br \/>\n&#8212;<br \/>\n\u6d4b\u8bd5\u7528\u4f8b 3: [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3]<br \/>\n\u7ed3\u679c: true<br \/>\n\u9884\u671f: true<br \/>\n&#8212;<br \/>\n\u6d4b\u8bd5\u7528\u4f8b 4: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]<br \/>\n\u7ed3\u679c: false<br \/>\n\u9884\u671f: false<br \/>\n&#8212;<br \/>\n\u6d4b\u8bd5\u7528\u4f8b 5: [1, 1, 1, 1]<br \/>\n\u7ed3\u679c: true<br \/>\n\u9884\u671f: true<br \/>\n&#8212;<\/p>\n<p>\u8fd9\u4e2a Demo \u4ee3\u7801\u53ef\u4ee5\u76f4\u63a5\u5728 Xcode \u6216 Swift Playground \u4e2d\u8fd0\u884c&#xff0c;\u4f60\u53ef\u4ee5\u4fee\u6539\u6d4b\u8bd5\u7528\u4f8b\u6765\u9a8c\u8bc1\u7b97\u6cd5\u7684\u6b63\u786e\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u76ee\u5f55\u6458\u8981\u63cf\u8ff0\u9898\u89e3\u7b54\u6848\u9898\u89e3\u4ee3\u7801\u5206\u67901. \u57fa\u7840\u5224\u65ad\u548c\u9884\u5904\u74062. \u56de\u6eaf\u7b97\u6cd5\u7684\u6838\u5fc3\u903b\u8f913. \u4e3a\u4ec0\u4e48\u8fd9\u4e2a\u7b97\u6cd5\u80fd\u5de5\u4f5c&#xff1f;4. \u4f18\u5316\u6280\u5de7\u793a\u4f8b\u6d4b\u8bd5\u53ca\u7ed3\u679c\u793a\u4f8b 1&#xff1a;matchsticks  [1,1,2,2,2]\u793a\u4f8b 2&#xff1a;matchsticks  [3,3,3,3,4]\u793a\u4f8b 3&#xff1a;matchsticks  [5,5,5,5,4,4,4,4,3,3,3,3]\u65f6\u95f4\u590d\u6742\u5ea6\u7a7a\u95f4\u590d\u6742\u5ea6\u5b9e\u9645\u5e94\u7528\u573a\u666f1. \u8d44\u6e90\u5206\u914d\u95ee\u98982. \u5bb9\u5668\u88c5\u7bb1\u95ee\u98983. \u4efb\u52a1\u8c03\u5ea6\u95ee<\/p>\n","protected":false},"author":2,"featured_media":59419,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[6264,2692,427],"topic":[],"class_list":["post-59423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-swift","tag-leetcode","tag-427"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>LeetCode 473 \u706b\u67f4\u62fc\u6b63\u65b9\u5f62 - Swift \u9898\u89e3 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/59423.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" 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