{"id":103574,"date":"2026-09-11T01:01:09","date_gmt":"2026-09-10T17:01:09","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/103574.html"},"modified":"2026-09-11T01:01:09","modified_gmt":"2026-09-10T17:01:09","slug":"%e3%80%90leetcode-%e5%88%b7%e9%a2%98%e6%97%a5%e5%bf%97%e3%80%91%e5%93%88%e5%b8%8c%e8%a1%a8%e7%bb%8f%e5%85%b8%e5%8f%8c%e9%a2%98%ef%bc%9a242-%e6%9c%89%e6%95%88%e7%9a%84%e5%ad%97%e6%af%8d%e5%bc%82","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/103574.html","title":{"rendered":"\u3010LeetCode \u5237\u9898\u65e5\u5fd7\u3011\u54c8\u5e0c\u8868\u7ecf\u5178\u53cc\u9898\uff1a242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd &amp; 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4\uff08C++ \u8be6\u89e3\uff09"},"content":{"rendered":"<h2>\u3010LeetCode \u5237\u9898\u65e5\u5fd7\u3011\u54c8\u5e0c\u8868\u7ecf\u5178\u53cc\u9898&#xff1a;242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd &amp; 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4&#xff08;C&#043;&#043; \u8be6\u89e3&#xff09;<\/h2>\n<p>\u672c\u6587\u662f\u6211\u7684 LeetCode \u5237\u9898\u65e5\u5fd7\u7cfb\u5217\u4e4b\u4e00&#xff0c;\u7528 C&#043;&#043; \u8bed\u8a00\u6df1\u5165\u8bb2\u89e3\u4e24\u9053\u7ecf\u5178\u7684\u54c8\u5e0c\u8868\u9898\u76ee \u2014\u2014<\/p>\n<p>242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/p>\n<p>\u548c<\/p>\n<p>49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/p>\n<p>\u3002\u8fd9\u4e24\u9898\u4e00\u8109\u76f8\u627f&#xff0c;\u662f\u9762\u8bd5\u9ad8\u9891\u9898&#xff0c;\u4e5f\u662f\u638c\u63e1\u54c8\u5e0c\u8868\u601d\u60f3\u7684\u7edd\u4f73\u5165\u95e8\u7ec4\u5408\u3002\u6587\u7ae0\u5305\u542b\u5b8c\u6574\u7684\u9898\u76ee\u63cf\u8ff0\u3001\u591a\u79cd\u89e3\u9898\u601d\u8def\u3001C&#043;&#043; \u4ee3\u7801\u5b9e\u73b0\u3001\u590d\u6742\u5ea6\u5206\u6790\u3001\u8e29\u5751\u8bb0\u5f55\u548c\u5b66\u4e60\u611f\u609f&#xff0c;<\/p>\n<p>\u9002\u5408\u7b97\u6cd5\u65b0\u624b\u548c\u6709\u4e00\u5b9a\u57fa\u7840\u60f3\u8981\u5de9\u56fa\u54c8\u5e0c\u8868\u7684\u540c\u5b66<\/p>\n<p>\u9605\u8bfb\u3002<\/p>\n<hr \/>\n<h3>&#x1f4d1; \u672c\u6587\u76ee\u5f55<\/h3>\n<ul>\n<li>\u4e00\u3001\u529b\u6263 242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/li>\n<li>\u4e8c\u3001\u529b\u6263 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/li>\n<li>\u4e09\u3001\u4e24\u9898\u5173\u8054\u4e0e\u8fdb\u9636\u601d\u8003<\/li>\n<li>\u56db\u3001\u5237\u9898\u5fc3\u5f97\u4e0e\u5b66\u4e60\u611f\u609f<\/li>\n<li>\u4e94\u3001\u603b\u7ed3<\/li>\n<\/ul>\n<hr \/>\n<h3>&#x1f4cb; \u672c\u7bc7\u65e5\u5fd7\u5305\u542b\u7684\u9898\u76ee<\/h3>\n<table>\n<tr>\u5e8f\u53f7\u9898\u53f7\u9898\u76ee\u540d\u79f0\u96be\u5ea6\u6838\u5fc3\u8003\u70b9<\/tr>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>242<\/td>\n<td>\u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/td>\n<td>\u7b80\u5355<\/td>\n<td>\u54c8\u5e0c\u8868 \/ \u6570\u7ec4\u8ba1\u6570<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>49<\/td>\n<td>\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/td>\n<td>\u4e2d\u7b49<\/td>\n<td>\u54c8\u5e0c\u8868 \/ \u6392\u5e8f \/ \u5b57\u7b26\u4e32\u7f16\u7801<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&#x1f4a1;<\/p>\n<p>\u4e3a\u4ec0\u4e48\u628a\u8fd9\u4e24\u9898\u653e\u5728\u4e00\u8d77&#xff1f;<\/p>\n<p>\u7b2c 242 \u9898\u662f\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u5b57\u6bcd\u5f02\u4f4d\u8bcd&#xff0c;\u7b2c 49 \u9898\u662f\u5c06\u4e00\u7ec4\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4\u3002\u540e\u8005\u662f\u524d\u8005\u7684\u8fdb\u9636\u548c\u63a8\u5e7f&#xff0c;\u638c\u63e1\u4e86 242 \u7684\u6838\u5fc3\u601d\u60f3&#xff0c;49 \u5c31\u6c34\u5230\u6e20\u6210\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u529b\u6263 242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/h3>\n<h4>1.1 \u9898\u76ee\u63cf\u8ff0<\/h4>\n<p>\u7ed9\u5b9a\u4e24\u4e2a\u5b57\u7b26\u4e32 s \u548c t &#xff0c;\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\u6765\u5224\u65ad t \u662f\u5426\u662f s \u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a; \u82e5 s \u548c t \u4e2d\u6bcf\u4e2a\u5b57\u7b26\u51fa\u73b0\u7684\u6b21\u6570\u90fd\u76f8\u540c&#xff0c;\u5219\u79f0 s \u548c t \u4e92\u4e3a\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u3002<\/p>\n<p>\u793a\u4f8b 1&#xff1a;<\/p>\n<p>\u8f93\u5165: s &#061; &#034;anagram&#034;, t &#061; &#034;nagaram&#034;<\/p>\n<p>\u8f93\u51fa: true<\/p>\n<p>\u793a\u4f8b 2&#xff1a;<\/p>\n<p>\u8f93\u5165: s &#061; &#034;rat&#034;, t &#061; &#034;car&#034;<\/p>\n<p>\u8f93\u51fa: false<\/p>\n<p>\u63d0\u793a&#xff1a;<\/p>\n<ul>\n<li>\n<p>1 &lt;&#061; s.length, t.length &lt;&#061; 5 * 10^4<\/p>\n<\/li>\n<li>\n<p>s \u548c t \u4ec5\u5305\u542b\u5c0f\u5199\u5b57\u6bcd<\/p>\n<\/li>\n<\/ul>\n<p>\u8fdb\u9636&#xff1a; \u5982\u679c\u8f93\u5165\u5b57\u7b26\u4e32\u5305\u542b unicode \u5b57\u7b26\u600e\u4e48\u529e&#xff1f;\u4f60\u80fd\u5426\u8c03\u6574\u4f60\u7684\u89e3\u6cd5\u6765\u5e94\u5bf9\u8fd9\u79cd\u60c5\u51b5&#xff1f;<\/p>\n<hr \/>\n<h4>1.2 \u89e3\u9898\u601d\u8def<\/h4>\n<h5>\u601d\u8def\u4e00&#xff1a;\u6392\u5e8f\u6cd5&#xff08;\u6700\u76f4\u89c2&#xff09;<\/h5>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u5982\u679c\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5b57\u6bcd\u5f02\u4f4d\u8bcd&#xff0c;\u90a3\u4e48\u628a\u5b83\u4eec\u6392\u5e8f\u540e\u5f97\u5230\u7684\u5b57\u7b26\u4e32\u4e00\u5b9a\u5b8c\u5168\u76f8\u540c\u3002<\/p>\n<p>\u6b65\u9aa4&#xff1a;<\/p>\n<li>\n<p>\u5148\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6\u662f\u5426\u76f8\u7b49&#xff0c;\u4e0d\u76f8\u7b49\u76f4\u63a5\u8fd4\u56de false<\/p>\n<\/li>\n<li>\n<p>\u5206\u522b\u5bf9\u4e24\u4e2a\u5b57\u7b26\u4e32\u8fdb\u884c\u6392\u5e8f<\/p>\n<\/li>\n<li>\n<p>\u6bd4\u8f83\u6392\u5e8f\u540e\u7684\u5b57\u7b26\u4e32\u662f\u5426\u76f8\u7b49<\/p>\n<\/li>\n<p>\u4f18\u70b9&#xff1a; \u601d\u8def\u7b80\u5355&#xff0c;\u4ee3\u7801\u77ed&#xff0c;\u5bb9\u6613\u60f3\u5230\u7f3a\u70b9&#xff1a; \u6392\u5e8f\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u8f83\u9ad8&#xff0c;\u4e3a O(n log n)n)<\/p>\n<h5>\u601d\u8def\u4e8c&#xff1a;\u54c8\u5e0c\u8868\u8ba1\u6570\u6cd5&#xff08;\u6700\u4f18\u89e3&#xff09;<\/h5>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u9898\u76ee\u660e\u786e\u8bf4\u660e\u53ea\u5305\u542b\u5c0f\u5199\u5b57\u6bcd&#xff0c;\u5171 26 \u4e2a&#xff0c;\u56e0\u6b64\u53ef\u4ee5\u7528\u4e00\u4e2a\u957f\u5ea6\u4e3a 26 \u7684\u6570\u7ec4\u6765\u6a21\u62df\u54c8\u5e0c\u8868&#xff0c;\u7edf\u8ba1\u6bcf\u4e2a\u5b57\u7b26\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<p>\u6b65\u9aa4&#xff1a;<\/p>\n<li>\n<p>\u5148\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6\u662f\u5426\u76f8\u7b49&#xff0c;\u4e0d\u76f8\u7b49\u76f4\u63a5\u8fd4\u56de false<\/p>\n<\/li>\n<li>\n<p>\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a 26 \u7684\u6574\u578b\u6570\u7ec4 count&#xff0c;\u521d\u59cb\u5316\u4e3a 0<\/p>\n<\/li>\n<li>\n<p>\u904d\u5386\u5b57\u7b26\u4e32 s&#xff0c;\u5bf9\u6bcf\u4e2a\u5b57\u7b26&#xff0c;\u5728 count \u6570\u7ec4\u5bf9\u5e94\u4f4d\u7f6e &#043;1<\/p>\n<\/li>\n<li>\n<p>\u904d\u5386\u5b57\u7b26\u4e32 t&#xff0c;\u5bf9\u6bcf\u4e2a\u5b57\u7b26&#xff0c;\u5728 count \u6570\u7ec4\u5bf9\u5e94\u4f4d\u7f6e -1<\/p>\n<\/li>\n<li>\n<p>\u6700\u540e\u68c0\u67e5 count \u6570\u7ec4\u662f\u5426\u5168\u90e8\u4e3a 0&#xff0c;\u82e5\u662f\u5219\u8fd4\u56de true&#xff0c;\u5426\u5219\u8fd4\u56de false<\/p>\n<\/li>\n<p>\u4f18\u5316\u6280\u5de7&#xff1a; \u5728\u904d\u5386 t \u7684\u8fc7\u7a0b\u4e2d&#xff0c;\u5982\u679c\u67d0\u4e2a\u4f4d\u7f6e\u51cf\u5230\u8d1f\u6570&#xff0c;\u53ef\u4ee5\u63d0\u524d\u8fd4\u56de false&#xff0c;\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684\u904d\u5386\u3002<\/p>\n<hr \/>\n<h4>1.3 C&#043;&#043; \u4ee3\u7801\u5b9e\u73b0<\/h4>\n<h5>\u65b9\u6cd5\u4e00&#xff1a;\u6392\u5e8f\u6cd5<\/h5>\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\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">isAnagram<\/span><span class=\"token punctuation\">(<\/span>string s<span class=\"token punctuation\">,<\/span> string t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n         <span class=\"token comment\">\/\/ \u957f\u5ea6\u4e0d\u540c\u76f4\u63a5\u8fd4\u56defalse<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> t<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><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><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6392\u5e8f\u540e\u6bd4\u8f83<\/span><br \/>\n        <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>t<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> s <span class=\"token operator\">&#061;&#061;<\/span> t<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u65b9\u6cd5\u4e8c&#xff1a;\u6570\u7ec4\u8ba1\u6570\u6cd5&#xff08;\u63a8\u8350&#xff09;<\/h5>\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\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">bool<\/span> <span class=\"token function\">isAnagram<\/span><span class=\"token punctuation\">(<\/span>string s<span class=\"token punctuation\">,<\/span> string t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> t<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><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><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">table<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">26<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> ch<span class=\"token operator\">:<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            table<span class=\"token punctuation\">[<\/span>ch <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> ch<span class=\"token operator\">:<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            table<span class=\"token punctuation\">[<\/span>ch <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>table<span class=\"token punctuation\">[<\/span>ch <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/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><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h4>1.4 \u590d\u6742\u5ea6\u5206\u6790<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u65f6\u95f4\u590d\u6742\u5ea6\u7a7a\u95f4\u590d\u6742\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u6392\u5e8f\u6cd5<\/td>\n<td>O(n log n)<\/td>\n<td>O (1) \u6216 O (log n)&#xff08;\u53d6\u51b3\u4e8e\u6392\u5e8f\u7b97\u6cd5\u7684\u6808\u7a7a\u95f4&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u54c8\u5e0c\u8868\u6cd5<\/td>\n<td>O(n)<\/td>\n<td>O (1)&#xff08;\u5b57\u7b26\u96c6\u5927\u5c0f\u56fa\u5b9a&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5176\u4e2d n \u4e3a\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/p>\n<hr \/>\n<h4>1.5 \u8e29\u5751\u8bb0\u5f55\u4e0e\u6ce8\u610f\u70b9<\/h4>\n<li>\n<p>\u5fd8\u8bb0\u5148\u5224\u65ad\u957f\u5ea6&#xff1a;\u5982\u679c\u4e24\u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u540c&#xff0c;\u4e00\u5b9a\u4e0d\u662f\u5b57\u6bcd\u5f02\u4f4d\u8bcd&#xff0c;\u53ef\u4ee5\u63d0\u524d\u8fd4\u56de&#xff0c;\u8fd9\u662f\u6700\u57fa\u672c\u7684\u526a\u679d\u3002<\/p>\n<\/li>\n<li>\n<p>\u6570\u7ec4\u521d\u59cb\u5316\u95ee\u9898&#xff1a;int count[26] &#061; {0}; \u53ef\u4ee5\u5c06\u6570\u7ec4\u5168\u90e8\u521d\u59cb\u5316\u4e3a 0&#xff0c;\u4f46\u5982\u679c\u5199\u6210 int count[26]; \u5219\u6570\u7ec4\u5143\u7d20\u662f\u672a\u5b9a\u4e49\u7684\u968f\u673a\u503c&#xff0c;\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b57\u7b26\u504f\u79fb\u8ba1\u7b97&#xff1a;c &#8211; &#039;a&#039; \u53ef\u4ee5\u5c06\u5c0f\u5199\u5b57\u6bcd\u6620\u5c04\u5230 0-25 \u7684\u4e0b\u6807&#xff0c;\u8fd9\u662f\u5e38\u7528\u6280\u5de7\u3002<\/p>\n<\/li>\n<li>\n<p>\u63d0\u524d\u526a\u679d\u7684\u4f4d\u7f6e&#xff1a;\u5728\u904d\u5386 t \u65f6\u51cf\u5230\u8d1f\u6570\u5c31\u8fd4\u56de false&#xff0c;\u8fd9\u4e2a\u4f18\u5316\u53ea\u5728\u957f\u5ea6\u76f8\u7b49\u7684\u524d\u63d0\u4e0b\u6709\u6548&#xff08;\u6211\u4eec\u5df2\u7ecf\u5148\u5224\u65ad\u4e86\u957f\u5ea6&#xff09;&#xff0c;\u56e0\u4e3a\u5982\u679c\u957f\u5ea6\u76f8\u7b49&#xff0c;\u53ea\u8981\u6709\u4e00\u4e2a\u4f4d\u7f6e\u662f\u8d1f\u6570&#xff0c;\u6700\u7ec8\u4e00\u5b9a\u4e0d\u53ef\u80fd\u5168\u4e3a 0\u3002<\/p>\n<\/li>\n<hr \/>\n<h3>\u4e8c\u3001\u529b\u6263 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/h3>\n<h4>2.1 \u9898\u76ee\u63cf\u8ff0<\/h4>\n<p>\u7ed9\u4f60\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4&#xff0c;\u8bf7\u4f60\u5c06\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u7ec4\u5408\u5728\u4e00\u8d77\u3002\u53ef\u4ee5\u6309\u4efb\u610f\u987a\u5e8f\u8fd4\u56de\u7ed3\u679c\u5217\u8868\u3002<\/p>\n<p>\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u6307\u5b57\u6bcd\u76f8\u540c&#xff0c;\u4f46\u6392\u5217\u4e0d\u540c\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u793a\u4f8b 1&#xff1a;<\/p>\n<p>\u8f93\u5165: strs &#061; [&#034;eat&#034;, &#034;tea&#034;, &#034;tan&#034;, &#034;ate&#034;, &#034;nat&#034;, &#034;bat&#034;]<\/p>\n<p>\u8f93\u51fa: [[&#034;bat&#034;],[&#034;nat&#034;,&#034;tan&#034;],[&#034;ate&#034;,&#034;eat&#034;,&#034;tea&#034;]]<\/p>\n<p>\u793a\u4f8b 2&#xff1a;<\/p>\n<p>\u8f93\u5165: strs &#061; [&#034;&#034;]<\/p>\n<p>\u8f93\u51fa: [[&#034;&#034;]]<\/p>\n<p>\u793a\u4f8b 3&#xff1a;<\/p>\n<p>\u8f93\u5165: strs &#061; [&#034;a&#034;]<\/p>\n<p>\u8f93\u51fa: [[&#034;a&#034;]]<\/p>\n<p>\u63d0\u793a&#xff1a;<\/p>\n<ul>\n<li>\n<p>1 &lt;&#061; strs.length &lt;&#061; 10^4<\/p>\n<\/li>\n<li>\n<p>0 &lt;&#061; strs[i].length &lt;&#061; 100<\/p>\n<\/li>\n<li>\n<p>strs[i] \u4ec5\u5305\u542b\u5c0f\u5199\u5b57\u6bcd<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>2.2 \u89e3\u9898\u601d\u8def<\/h4>\n<h5>\u601d\u8def\u4e00&#xff1a;\u6392\u5e8f &#043; \u54c8\u5e0c\u8868&#xff08;\u6700\u5e38\u7528&#xff09;<\/h5>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u4e92\u4e3a\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u7684\u5b57\u7b26\u4e32&#xff0c;\u6392\u5e8f\u540e\u7684\u7ed3\u679c\u76f8\u540c\u3002\u56e0\u6b64\u53ef\u4ee5\u5c06\u6392\u5e8f\u540e\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u54c8\u5e0c\u8868\u7684 key&#xff0c;\u539f\u59cb\u5b57\u7b26\u4e32\u4f5c\u4e3a value \u5b58\u5165\u5bf9\u5e94\u7684\u5217\u8868\u4e2d\u3002<\/p>\n<p>\u6b65\u9aa4&#xff1a;<\/p>\n<li>\n<p>\u521b\u5efa\u4e00\u4e2a unordered_map&lt;string, vector&lt;string&gt;&gt; \u54c8\u5e0c\u8868<\/p>\n<\/li>\n<li>\n<p>\u904d\u5386\u6bcf\u4e2a\u5b57\u7b26\u4e32&#xff1a;<\/p>\n<\/li>\n<ul>\n<li>\n<p>\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u6392\u5e8f&#xff0c;\u5f97\u5230 key<\/p>\n<\/li>\n<li>\n<p>\u5c06\u539f\u59cb\u5b57\u7b26\u4e32\u6dfb\u52a0\u5230\u54c8\u5e0c\u8868\u4e2d key \u5bf9\u5e94\u7684 vector \u4e2d<\/p>\n<\/li>\n<\/ul>\n<li>\u904d\u5386\u54c8\u5e0c\u8868&#xff0c;\u5c06\u6240\u6709 vector \u6536\u96c6\u5230\u7ed3\u679c\u4e2d\u8fd4\u56de<\/li>\n<h5>\u601d\u8def\u4e8c&#xff1a;\u5b57\u7b26\u8ba1\u6570\u7f16\u7801 &#043; \u54c8\u5e0c\u8868&#xff08;\u4f18\u5316\u7248&#xff09;\u6838\u5fc3\u601d\u60f3&#xff1a; \u6392\u5e8f\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662f O(k log k)&#xff08;k \u4e3a\u5b57\u7b26\u4e32\u957f\u5ea6&#xff09;&#xff0c;\u6211\u4eec\u53ef\u4ee5\u7528\u8ba1\u6570\u7684\u65b9\u5f0f\u751f\u6210\u4e00\u4e2a\u552f\u4e00\u7684\u7f16\u7801\u4f5c\u4e3a key&#xff0c;\u65f6\u95f4\u590d\u6742\u5ea6\u964d\u4e3a O(k)\u3002)\u3002<\/h5>\n<p>\u7f16\u7801\u65b9\u5f0f&#xff1a; \u7531\u4e8e\u53ea\u6709 26 \u4e2a\u5c0f\u5199\u5b57\u6bcd&#xff0c;\u6211\u4eec\u53ef\u4ee5\u7edf\u8ba1\u6bcf\u4e2a\u5b57\u7b26\u51fa\u73b0\u7684\u6b21\u6570&#xff0c;\u7136\u540e\u7528\u4e00\u79cd\u5206\u9694\u7b26&#xff08;\u5982 #&#xff09;\u62fc\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u4f5c\u4e3a key\u3002\u4f8b\u5982 &#034;aab&#034; \u7684\u8ba1\u6570\u662f a:2, b:1&#xff0c;\u7f16\u7801\u4e3a &#034;2#1#0#0#&#8230;#0&#034;&#xff08;\u5171 26 \u4e2a\u6570\u5b57&#xff0c;\u7528 # \u5206\u9694&#xff09;\u3002&#xff09;\u3002<\/p>\n<p>\u6b65\u9aa4&#xff1a;<\/p>\n<li>\n<p>\u521b\u5efa\u54c8\u5e0c\u8868&#xff0c;key \u4e3a\u7f16\u7801\u5b57\u7b26\u4e32&#xff0c;value \u4e3a\u5b57\u7b26\u4e32\u5217\u8868<\/p>\n<\/li>\n<li>\n<p>\u904d\u5386\u6bcf\u4e2a\u5b57\u7b26\u4e32&#xff1a;<\/p>\n<\/li>\n<ul>\n<li>\n<p>\u7edf\u8ba1 26 \u4e2a\u5b57\u6bcd\u5404\u81ea\u51fa\u73b0\u7684\u6b21\u6570<\/p>\n<\/li>\n<li>\n<p>\u5c06\u8ba1\u6570\u6570\u7ec4\u7f16\u7801\u6210\u552f\u4e00\u5b57\u7b26\u4e32\u4f5c\u4e3a key<\/p>\n<\/li>\n<li>\n<p>\u5c06\u539f\u59cb\u5b57\u7b26\u4e32\u52a0\u5165\u5bf9\u5e94\u5217\u8868<\/p>\n<\/li>\n<\/ul>\n<li>\u6536\u96c6\u7ed3\u679c\u8fd4\u56de<\/li>\n<hr \/>\n<h4>2.3 C&#043;&#043; \u4ee3\u7801\u5b9e\u73b0<\/h4>\n<h5>\u65b9\u6cd5\u4e00&#xff1a;\u6392\u5e8f &#043; \u54c8\u5e0c\u8868<\/h5>\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\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> <span class=\"token function\">groupAnagrams<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> strs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        unordered_map<span class=\"token operator\">&lt;<\/span>string<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> mp<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>string<span class=\"token operator\">&amp;<\/span> str<span class=\"token operator\">:<\/span> strs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n             <span class=\"token comment\">\/\/ \u6392\u5e8f\u540e\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3akey<\/span><br \/>\n            string key <span class=\"token operator\">&#061;<\/span> str<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            mp<span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">emplace_back<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n          <span class=\"token comment\">\/\/ \u6536\u96c6\u7ed3\u679c<\/span><br \/>\n        vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> ans<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span> it <span class=\"token operator\">&#061;<\/span> mp<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> it <span class=\"token operator\">!&#061;<\/span> mp<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>it<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            ans<span class=\"token punctuation\">.<\/span><span class=\"token function\">emplace_back<\/span><span class=\"token punctuation\">(<\/span>it<span class=\"token operator\">-&gt;<\/span>second<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> ans<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u65b9\u6cd5\u4e8c&#xff1a;\u5229\u7528 C&#043;&#043;17 \u7ed3\u6784\u5316\u7ed1\u5b9a\u7b80\u5316\u4ee3\u7801<\/h5>\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\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> <span class=\"token function\">groupAnagrams<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> strs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        unordered_map<span class=\"token operator\">&lt;<\/span>string<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> mp<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> str <span class=\"token operator\">:<\/span> strs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            string key <span class=\"token operator\">&#061;<\/span> str<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            mp<span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ C&#043;&#043;17\u7ed3\u6784\u5316\u7ed1\u5b9a<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">,<\/span> group<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">:<\/span> mp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>group<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4f7f\u7528move\u907f\u514d\u62f7\u8d1d<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h4>2.4 \u590d\u6742\u5ea6\u5206\u6790<\/h4>\n<p>\u8bbe n \u4e3a\u5b57\u7b26\u4e32\u6570\u7ec4\u7684\u957f\u5ea6&#xff0c;k \u4e3a\u6bcf\u4e2a\u5b57\u7b26\u4e32\u7684\u6700\u5927\u957f\u5ea6\u3002<\/p>\n<table>\n<tr>\u65b9\u6cd5\u65f6\u95f4\u590d\u6742\u5ea6\u7a7a\u95f4\u590d\u6742\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u6392\u5e8f &#043; \u54c8\u5e0c\u8868<\/td>\n<td>O(n \u00d7 k log k)<\/td>\n<td>O(n \u00d7 k)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u6392\u5e8f\u6cd5\u4e2d&#xff0c;\u6bcf\u4e2a\u5b57\u7b26\u4e32\u6392\u5e8f\u9700\u8981 O (k log k)&#xff0c;\u5171 n \u4e2a\u5b57\u7b26\u4e32<\/p>\n<\/li>\n<li>\n<p>\u7a7a\u95f4\u4e0a&#xff0c;\u54c8\u5e0c\u8868\u9700\u8981\u5b58\u50a8\u6240\u6709\u5b57\u7b26\u4e32&#xff0c;\u4e3a O (n \u00d7 k)<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h4>2.5 \u8e29\u5751\u8bb0\u5f55\u4e0e\u6ce8\u610f\u70b9<\/h4>\n<li>\n<p>\u7f16\u7801\u5fc5\u987b\u7528\u5206\u9694\u7b26&#xff1a;\u5982\u679c\u76f4\u63a5\u628a\u8ba1\u6570\u62fc\u63a5\u6210\u6570\u5b57\u5b57\u7b26\u4e32&#xff0c;\u4f1a\u4ea7\u751f\u6b67\u4e49\u3002\u4f8b\u5982 count &#061; [1, 23] \u548c count &#061; [12, 3] \u62fc\u63a5\u540e\u90fd\u662f &#034;123&#034;&#xff0c;\u5fc5\u987b\u7528 # \u7b49\u5206\u9694\u7b26\u533a\u5206\u3002<\/p>\n<\/li>\n<li>\n<p>\u7a7a\u5b57\u7b26\u4e32\u7684\u5904\u7406&#xff1a;\u9898\u76ee\u4e2d\u53ef\u80fd\u51fa\u73b0\u7a7a\u5b57\u7b26\u4e32 &#034;&#034;&#xff0c;\u6392\u5e8f\u540e\u8fd8\u662f &#034;&#034;&#xff0c;\u8ba1\u6570\u5168\u4e3a 0&#xff0c;\u7f16\u7801\u4e5f\u80fd\u6b63\u786e\u5904\u7406&#xff0c;\u4e0d\u9700\u8981\u7279\u6b8a\u5224\u65ad\u3002<\/p>\n<\/li>\n<li>\n<p>unordered_map vs map&#xff1a;\u8fd9\u91cc\u7528 unordered_map \u5e73\u5747\u65f6\u95f4\u590d\u6742\u5ea6\u66f4\u4f4e&#xff08;O (1) \u63d2\u5165&#xff09;&#xff0c;map \u662f O (log n)\u3002\u9898\u76ee\u4e0d\u8981\u6c42\u7ed3\u679c\u6709\u5e8f&#xff0c;\u6240\u4ee5\u7528 unordered_map\u3002<\/p>\n<\/li>\n<li>\n<p>push_back vs emplace_back&#xff1a;\u5bf9\u4e8e\u5b57\u7b26\u4e32\u8fd9\u79cd\u53ef\u4ee5\u79fb\u52a8\u7684\u5bf9\u8c61&#xff0c;emplace_back \u6709\u65f6\u66f4\u9ad8\u6548&#xff0c;\u4f46 push_back \u914d\u5408\u53f3\u503c\u5f15\u7528\u4e5f\u80fd\u8fbe\u5230\u540c\u6837\u6548\u679c\u3002<\/p>\n<\/li>\n<li>\n<p>\u7ed3\u679c\u987a\u5e8f&#xff1a;\u9898\u76ee\u8bf4 \u201c\u53ef\u4ee5\u6309\u4efb\u610f\u987a\u5e8f\u8fd4\u56de\u7ed3\u679c\u5217\u8868\u201d&#xff0c;\u6240\u4ee5\u4e0d\u9700\u8981\u5bf9\u6700\u7ec8\u7ed3\u679c\u6392\u5e8f\u3002<\/p>\n<\/li>\n<hr \/>\n<h3>\u4e09\u3001\u4e24\u9898\u5173\u8054\u4e0e\u8fdb\u9636\u601d\u8003<\/h3>\n<h4>3.1 \u4ece 242 \u5230 49 \u7684\u601d\u7ef4\u8dc3\u8fc1<\/h4>\n<table>\n<tr>\u7ef4\u5ea6242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/tr>\n<tbody>\n<tr>\n<td>\u8f93\u5165<\/td>\n<td>\u4e24\u4e2a\u5b57\u7b26\u4e32<\/td>\n<td>\u4e00\u7ec4\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<tr>\n<td>\u95ee\u9898<\/td>\n<td>\u5224\u65ad\u662f\u5426\u4e3a\u5f02\u4f4d\u8bcd<\/td>\n<td>\u5c06\u5f02\u4f4d\u8bcd\u5f52\u7c7b<\/td>\n<\/tr>\n<tr>\n<td>\u6838\u5fc3<\/td>\n<td>\u8ba1\u6570\u6bd4\u8f83<\/td>\n<td>\u54c8\u5e0c\u5206\u7ec4<\/td>\n<\/tr>\n<tr>\n<td>key<\/td>\n<td>\u4e0d\u9700\u8981 key&#xff0c;\u76f4\u63a5\u6bd4\u8ba1\u6570\u6570\u7ec4<\/td>\n<td>\u6392\u5e8f\u5b57\u7b26\u4e32 \/ \u8ba1\u6570\u7f16\u7801<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u601d\u7ef4\u63d0\u70bc&#xff1a; 242 \u9898\u4e2d\u6211\u4eec\u7528\u8ba1\u6570\u6570\u7ec4\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u5339\u914d&#xff1b;49 \u9898\u4e2d&#xff0c;\u6211\u4eec\u9700\u8981\u628a \u201c\u5339\u914d\u201d \u8fd9\u4e2a\u5173\u7cfb\u63a8\u5e7f\u5230\u4e00\u7ec4\u5b57\u7b26\u4e32\u4e2d&#xff0c;\u81ea\u7136\u5c31\u60f3\u5230\u7528\u54c8\u5e0c\u8868\u628a\u76f8\u540c\u7279\u5f81\u7684\u5b57\u7b26\u4e32\u5f52\u5230\u4e00\u8d77\u3002\u8fd9\u5c31\u662f\u4ece \u201c\u4e24\u4e24\u6bd4\u8f83\u201d \u5230 \u201c\u6309\u7279\u5f81\u5206\u7ec4\u201d \u7684\u601d\u7ef4\u5347\u7ea7\u3002<\/p>\n<h4>3.2 \u53ef\u590d\u7528\u6a21\u677f\u6c47\u603b&#xff08;\u5176\u4ed6\u9898\u76ee\u76f4\u63a5\u5957\u7528&#xff09;<\/h4>\n<p>\u8fd9\u4e24\u9053\u9898\u867d\u7136\u8868\u9762\u4e0d\u540c&#xff0c;\u4f46\u63d0\u70bc\u51fa\u7684\u6a21\u677f\u53ef\u4ee5\u590d\u7528\u5230\u5927\u91cf\u540c\u7c7b\u9898\u76ee\u4e2d\u3002\u4ee5\u4e0b\u662f\u4ece\u672c\u9898\u4e2d\u603b\u7ed3\u7684 4 \u4e2a\u56fa\u5b9a\u6a21\u677f&#xff0c;\u6bcf\u4e2a\u6a21\u677f\u7ed9\u51fa\u4ee3\u7801\u3001\u9002\u7528\u573a\u666f\u548c\u53ef\u76f4\u63a5\u5957\u7528\u7684\u9898\u76ee\u3002<\/p>\n<hr \/>\n<h5>\u6a21\u677f\u4e00&#xff1a;\u5b57\u7b26\u8ba1\u6570\u6570\u7ec4\u6a21\u677f&#xff08;\u6e90\u81ea 242 \u9898&#xff09;<\/h5>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u5f53\u5b57\u7b26\u96c6\u8303\u56f4\u6709\u9650\u4e14\u8f83\u5c0f\u65f6&#xff08;\u5982\u5c0f\u5199\u5b57\u6bcd 26 \u4e2a\u3001ASCII 128 \u4e2a&#xff09;&#xff0c;\u7528\u6570\u7ec4\u4ee3\u66ff unordered_map \u8fdb\u884c\u8ba1\u6570&#xff0c;\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u677f&#xff1a;\u5b57\u7b26\u9891\u7387\u8ba1\u6570<\/span><br \/>\n<span class=\"token comment\">\/\/ \u9002\u7528&#xff1a;\u4ec5\u542b\u5c0f\u5199\u5b57\u6bcd \/ \u5927\u5199\u5b57\u6bcd \/ ASCII\u5b57\u7b26 \u7684\u5b57\u7b26\u4e32\u7edf\u8ba1\u95ee\u9898<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">countChars<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">26<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ 26\u4e2a\u5c0f\u5199\u5b57\u6bcd&#xff1b;\u5927\u5199\u5b57\u6bcd\u752826&#xff0c;ASCII\u7528128<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> c <span class=\"token operator\">:<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token punctuation\">[<\/span>c <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u5c0f\u5199\u5b57\u6bcd\u504f\u79fb&#xff1b;\u5927\u5199\u5b57\u6bcd\u7528 c &#8211; &#039;A&#039;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u677f&#xff1a;\u4e24\u4e2a\u5b57\u7b26\u4e32\u8ba1\u6570\u6bd4\u8f83&#xff08;\u5224\u65ad\u662f\u5426\u4e92\u4e3a\u5f02\u4f4d\u8bcd\/\u53d8\u4f4d\u8bcd&#xff09;<\/span><br \/>\n<span class=\"token keyword\">bool<\/span> <span class=\"token function\">compareCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> t<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u957f\u5ea6\u526a\u679d<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">[<\/span><span class=\"token number\">26<\/span><span class=\"token punctuation\">]<\/span> <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 punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> c <span class=\"token operator\">:<\/span> s<span class=\"token punctuation\">)<\/span> count<span class=\"token punctuation\">[<\/span>c <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> c <span class=\"token operator\">:<\/span> t<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token punctuation\">[<\/span>c <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>count<span class=\"token punctuation\">[<\/span>c <span class=\"token operator\">&#8211;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u63d0\u524d\u526a\u679d<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9002\u7528\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u5b57\u7b26\u9891\u7387\u7edf\u8ba1\u4e0e\u6bd4\u8f83<\/li>\n<li>\u5224\u65ad\u4e24\u4e2a\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u5f02\u4f4d\u8bcd \/ \u53d8\u4f4d\u8bcd<\/li>\n<li>\u627e\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u4e2a\u4e0d\u91cd\u590d\u7684\u5b57\u7b26<\/li>\n<li>\u8d4e\u91d1\u4fe1&#xff08;\u5b57\u7b26\u4e32\u80fd\u5426\u7531\u53e6\u4e00\u4e2a\u5b57\u7b26\u4e32\u6784\u9020&#xff09;<\/li>\n<\/ul>\n<p>\u53ef\u76f4\u63a5\u5957\u7528\u7684\u9898\u76ee&#xff1a;<\/p>\n<table>\n<tr>\u9898\u53f7\u9898\u76ee\u540d\u79f0\u5957\u7528\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>242<\/td>\n<td>\u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/td>\n<td>\u76f4\u63a5\u4f7f\u7528 compareCount<\/td>\n<\/tr>\n<tr>\n<td>383<\/td>\n<td>\u8d4e\u91d1\u4fe1<\/td>\n<td>\u8ba1\u6570\u540e\u6bd4\u8f83&#xff0c;magazine \u4e2d\u6bcf\u4e2a\u5b57\u7b26\u6570 &gt;&#061; ransomNote<\/td>\n<\/tr>\n<tr>\n<td>387<\/td>\n<td>\u5b57\u7b26\u4e32\u4e2d\u7684\u7b2c\u4e00\u4e2a\u552f\u4e00\u5b57\u7b26<\/td>\n<td>\u8ba1\u6570\u540e\u627e\u7b2c\u4e00\u4e2a count&#061;&#061;1 \u7684\u5b57\u7b26<\/td>\n<\/tr>\n<tr>\n<td>409<\/td>\n<td>\u6700\u957f\u56de\u6587\u4e32<\/td>\n<td>\u7edf\u8ba1\u5b57\u7b26\u9891\u7387&#xff0c;\u5076\u6570\u5168\u7528&#xff0c;\u5947\u6570\u53d6\u5076\u6570\u90e8\u5206&#043;1<\/td>\n<\/tr>\n<tr>\n<td>438<\/td>\n<td>\u627e\u5230\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5b57\u6bcd\u5f02\u4f4d\u8bcd<\/td>\n<td>\u6ed1\u52a8\u7a97\u53e3 &#043; \u8ba1\u6570\u6570\u7ec4\u6bd4\u8f83<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h5>\u6a21\u677f\u4e8c&#xff1a;\u54c8\u5e0c\u8868\u7279\u5f81\u5206\u7ec4\u6a21\u677f&#xff08;\u6e90\u81ea 49 \u9898&#xff09;<\/h5>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u5bf9\u4e8e\u4e00\u7ec4\u5143\u7d20&#xff0c;\u63d0\u53d6\u6bcf\u4e2a\u5143\u7d20\u7684&#034;\u7279\u5f81&#034;\u4f5c\u4e3a\u54c8\u5e0c\u8868\u7684 key&#xff0c;\u5c06\u76f8\u540c\u7279\u5f81\u7684\u5143\u7d20\u5f52\u4e3a\u4e00\u7ec4\u3002\u8fd9\u662f\u5206\u7ec4\u7c7b\u95ee\u9898\u7684\u901a\u7528\u89e3\u6cd5\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u677f&#xff1a;\u6309\u7279\u5f81\u5206\u7ec4<\/span><br \/>\n<span class=\"token comment\">\/\/ \u9002\u7528&#xff1a;\u9700\u8981\u5c06\u4e00\u7ec4\u5143\u7d20\u6309\u67d0\u79cd\u5171\u540c\u7279\u5f81\u5f52\u7c7b\u7684\u95ee\u9898<\/span><br \/>\n<span class=\"token keyword\">template<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">typename<\/span> <span class=\"token class-name\">T<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">typename<\/span> <span class=\"token class-name\">KeyType<\/span><span class=\"token operator\">&gt;<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;&gt;<\/span> <span class=\"token function\">groupByFeature<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> vector<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> items<span class=\"token punctuation\">,<\/span><br \/>\n                                   function<span class=\"token operator\">&lt;<\/span><span class=\"token function\">KeyType<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> T<span class=\"token operator\">&amp;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&gt;<\/span> extractFeature<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    unordered_map<span class=\"token operator\">&lt;<\/span>KeyType<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;&gt;<\/span> mp<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> T<span class=\"token operator\">&amp;<\/span> item <span class=\"token operator\">:<\/span> items<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        KeyType key <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">extractFeature<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u63d0\u53d6\u7279\u5f81\u4f5c\u4e3akey<\/span><br \/>\n        mp<span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>T<span class=\"token operator\">&gt;&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">,<\/span> group<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">:<\/span> mp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>group<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9002\u7528\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u5c06\u4e00\u7ec4\u5143\u7d20\u6309\u5171\u540c\u7279\u5f81\u5206\u7ec4<\/li>\n<li>\u67e5\u627e\u91cd\u590d\u5143\u7d20&#xff08;\u5206\u7ec4\u540e\u7ec4\u5927\u5c0f &gt; 1&#xff09;<\/li>\n<li>\u7edf\u8ba1\u6bcf\u7ec4\u7684\u6570\u91cf \/ \u6700\u5927\u503c \/ \u6700\u5c0f\u503c<\/li>\n<\/ul>\n<p>\u53ef\u76f4\u63a5\u5957\u7528\u7684\u9898\u76ee&#xff1a;<\/p>\n<table>\n<tr>\u9898\u53f7\u9898\u76ee\u540d\u79f0\u7279\u5f81\u63d0\u53d6\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>49<\/td>\n<td>\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/td>\n<td>\u6392\u5e8f\u540e\u7684\u5b57\u7b26\u4e32 \/ \u8ba1\u6570\u7f16\u7801<\/td>\n<\/tr>\n<tr>\n<td>249<\/td>\n<td>\u79fb\u4f4d\u5b57\u7b26\u4e32\u5206\u7ec4<\/td>\n<td>\u6bcf\u4e2a\u5b57\u7b26\u4e0e\u9996\u5b57\u7b26\u7684\u5dee\u503c\u5e8f\u5217<\/td>\n<\/tr>\n<tr>\n<td>609<\/td>\n<td>\u5728\u7cfb\u7edf\u4e2d\u67e5\u627e\u91cd\u590d\u6587\u4ef6<\/td>\n<td>\u6587\u4ef6\u5185\u5bb9&#xff08;MD5 \/ \u5b9e\u9645\u5185\u5bb9&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>811<\/td>\n<td>\u5b50\u57df\u540d\u8bbf\u95ee\u8ba1\u6570<\/td>\n<td>\u5404\u7ea7\u57df\u540d\u4f5c\u4e3a key&#xff0c;\u8ba1\u6570\u7d2f\u52a0<\/td>\n<\/tr>\n<tr>\n<td>2260<\/td>\n<td>\u5fc5\u987b\u62ff\u8d77\u7684\u6700\u5c0f\u8fde\u7eed\u5361\u724c\u6570<\/td>\n<td>\u6309\u5361\u724c\u503c\u5206\u7ec4&#xff0c;\u627e\u540c\u7ec4\u6700\u5c0f\u95f4\u8ddd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h5>\u6a21\u677f\u4e09&#xff1a;\u6392\u5e8f\u4f5c Key \u6a21\u677f&#xff08;\u6e90\u81ea 49 \u9898\u65b9\u6cd5\u4e00&#xff09;<\/h5>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u5f53\u5143\u7d20\u7684&#034;\u5185\u5bb9&#034;\u76f8\u540c\u4f46&#034;\u987a\u5e8f&#034;\u4e0d\u540c\u65f6&#xff0c;\u6392\u5e8f\u540e\u5f97\u5230\u7684\u7ed3\u679c\u76f8\u540c&#xff0c;\u53ef\u4ee5\u4f5c\u4e3a\u54c8\u5e0c\u8868\u7684 key\u3002\u8fd9\u662f\u6700\u7b80\u6d01\u7684\u7279\u5f81\u63d0\u53d6\u65b9\u5f0f\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u677f&#xff1a;\u6392\u5e8f\u540e\u4f5c\u4e3akey\u8fdb\u884c\u5206\u7ec4<\/span><br \/>\n<span class=\"token comment\">\/\/ \u9002\u7528&#xff1a;\u987a\u5e8f\u65e0\u5173\u3001\u5185\u5bb9\u76f8\u540c\u7684\u5143\u7d20\u5206\u7ec4<\/span><br \/>\nvector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> <span class=\"token function\">groupBySort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> strs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    unordered_map<span class=\"token operator\">&lt;<\/span>string<span class=\"token punctuation\">,<\/span> vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> mp<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> string<span class=\"token operator\">&amp;<\/span> s <span class=\"token operator\">:<\/span> strs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        string key <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> key<span class=\"token punctuation\">.<\/span><span class=\"token function\">end<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6392\u5e8f\u540e\u4f5c\u4e3akey<\/span><br \/>\n        mp<span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    vector<span class=\"token operator\">&lt;<\/span>vector<span class=\"token operator\">&lt;<\/span>string<span class=\"token operator\">&gt;&gt;<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">auto<\/span><span class=\"token operator\">&amp;<\/span> <span class=\"token punctuation\">[<\/span>key<span class=\"token punctuation\">,<\/span> group<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">:<\/span> mp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">push_back<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span>group<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9002\u7528\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4<\/li>\n<li>\u53d8\u4f4d\u8bcd \/ \u76f8\u540c\u5b57\u6bcd\u7ec4\u5408\u7684\u5f52\u7c7b<\/li>\n<li>\u6570\u7ec4\u4e2d\u5143\u7d20\u76f8\u540c\u4f46\u6392\u5217\u4e0d\u540c\u7684\u5206\u7ec4<\/li>\n<\/ul>\n<p>\u4f18\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u4ee3\u7801\u6781\u7b80&#xff0c;\u4e0d\u5bb9\u6613\u51fa\u9519<\/li>\n<li>\u9002\u7528\u4e8e\u4efb\u4f55\u53ef\u6392\u5e8f\u7684\u5143\u7d20\u7c7b\u578b<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\u542b\u6392\u5e8f\u56e0\u5b50 O(k log k)&#xff0c;k \u4e3a\u5143\u7d20\u957f\u5ea6<\/li>\n<li>\u8981\u6c42\u5143\u7d20\u53ef\u6392\u5e8f&#xff08;\u5b57\u7b26\u4e32\u3001\u6570\u7ec4\u7b49\u53ef\u4ee5&#xff0c;\u81ea\u5b9a\u4e49\u7ed3\u6784\u9700\u5b9a\u4e49\u6bd4\u8f83\u51fd\u6570&#xff09;<\/li>\n<\/ul>\n<p>\u53ef\u76f4\u63a5\u5957\u7528\u7684\u9898\u76ee&#xff1a; 49 \u9898\u3001249 \u9898&#xff08;\u9700\u8f6c\u6362\u540e\u6392\u5e8f&#xff09;\u3001\u9762\u8bd5\u9898 10.02&#xff08;\u53d8\u4f4d\u8bcd\u7ec4&#xff09;<\/p>\n<hr \/>\n<h5>\u6a21\u677f\u9009\u62e9\u901f\u67e5\u8868<\/h5>\n<table>\n<tr>\u573a\u666f\u63a8\u8350\u6a21\u677f\u65f6\u95f4\u590d\u6742\u5ea6\u7a7a\u95f4\u590d\u6742\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u4e24\u4e2a\u5b57\u7b26\u4e32\u6bd4\u8f83\u662f\u5426\u4e3a\u5f02\u4f4d\u8bcd<\/td>\n<td>\u6a21\u677f\u4e00&#xff1a;\u8ba1\u6570\u6570\u7ec4\u6bd4\u8f83<\/td>\n<td>O(n)<\/td>\n<td>O(1)<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u5b57\u7b26\u96c6\u4e0d\u9650 \/ \u4ee3\u7801\u6c42\u7b80\u6d01 &#043; \u5206\u7ec4<\/td>\n<td>\u6a21\u677f\u4e09&#xff1a;\u6392\u5e8f\u4f5c key<\/td>\n<td>O(n x k log k)<\/td>\n<td>O(n x k)<\/td>\n<\/tr>\n<tr>\n<td>\u901a\u7528\u5206\u7ec4&#xff08;\u7279\u5f81\u81ea\u5b9a\u4e49&#xff09;<\/td>\n<td>\u6a21\u677f\u4e8c&#xff1a;\u54c8\u5e0c\u8868\u7279\u5f81\u5206\u7ec4<\/td>\n<td>\u53d6\u51b3\u4e8e\u7279\u5f81\u63d0\u53d6<\/td>\n<td>O(n x k)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5b9e\u6218\u5efa\u8bae&#xff1a; \u9762\u8bd5\u4e2d\u5982\u679c\u5b57\u7b26\u4e32\u957f\u5ea6 k &lt;&#061; 100&#xff0c;\u6392\u5e8f\u6cd5&#xff08;\u6a21\u677f\u4e09&#xff09;\u4ee3\u7801\u77ed\u3001\u4e0d\u6613\u51fa\u9519&#xff0c;\u662f\u9996\u9009\u3002\u4e24\u4e2a\u5b57\u7b26\u4e32\u6bd4\u8f83\u7684\u573a\u666f\u6c38\u8fdc\u7528\u6a21\u677f\u4e00\u3002<\/p>\n<hr \/>\n<h3>\u56db\u3001\u5237\u9898\u5fc3\u5f97\u4e0e\u5b66\u4e60\u611f\u609f<\/h3>\n<h4>4.1 \u8fd9\u4e24\u9898\u80fd\u5b66\u5230\u4ec0\u4e48&#xff1f;<\/h4>\n<li>\n<p>\u54c8\u5e0c\u8868\u7684\u6838\u5fc3\u601d\u60f3&#xff1a;\u7528\u7a7a\u95f4\u6362\u65f6\u95f4&#xff0c;\u901a\u8fc7\u54c8\u5e0c\u51fd\u6570\u5c06\u5143\u7d20\u6620\u5c04\u5230\u552f\u4e00\u6807\u8bc6&#xff0c;\u5b9e\u73b0 O (1) \u7684\u67e5\u627e\u548c\u63d2\u5165\u3002<\/p>\n<\/li>\n<li>\n<p>\u6570\u7ec4\u6a21\u62df\u54c8\u5e0c\u8868\u7684\u6280\u5de7&#xff1a;\u5f53 key \u7684\u8303\u56f4\u6709\u9650\u4e14\u8f83\u5c0f\u65f6&#xff08;\u5982 26 \u4e2a\u5c0f\u5199\u5b57\u6bcd&#xff09;&#xff0c;\u7528\u6570\u7ec4\u4ee3\u66ff unordered_map \u66f4\u9ad8\u6548\u3002<\/p>\n<\/li>\n<li>\n<p>\u7279\u5f81\u63d0\u53d6\u7684\u601d\u7ef4&#xff1a;\u5bf9\u4e8e\u5206\u7ec4\u7c7b\u95ee\u9898&#xff0c;\u5173\u952e\u662f\u627e\u5230\u4e00\u4e2a\u80fd\u552f\u4e00\u6807\u8bc6\u7ec4\u5185\u5143\u7d20\u7684 \u201c\u7279\u5f81\u201d&#xff0c;\u5e76\u5c06\u5176\u4f5c\u4e3a\u54c8\u5e0c\u8868\u7684 key\u3002<\/p>\n<\/li>\n<li>\n<p>\u65f6\u95f4\u590d\u6742\u5ea6\u7684\u6743\u8861&#xff1a;\u6392\u5e8f\u6cd5\u4ee3\u7801\u7b80\u6d01\u4f46\u65f6\u95f4\u7a0d\u9ad8&#xff0c;\u8ba1\u6570\u6cd5\u65f6\u95f4\u66f4\u4f18\u4f46\u4ee3\u7801\u7a0d\u957f&#xff0c;\u8981\u6839\u636e\u6570\u636e\u89c4\u6a21\u548c\u5b9e\u9645\u573a\u666f\u9009\u62e9\u3002<\/p>\n<\/li>\n<h4>4.2 \u65b0\u624b\u5e38\u89c1\u8bef\u533a<\/h4>\n<p>1\u66b4\u529b\u89e3\u6cd5\u601d\u7ef4&#xff1a;\u65b0\u624b\u505a 49 \u9898\u65f6\u5bb9\u6613\u60f3\u5230\u4e24\u4e24\u6bd4\u8f83&#xff08;O(n\u00b2 \u00d7 k)&#xff09;&#xff0c;\u8fd9\u5728 n&#061;10^4 \u65f6\u4f1a\u8d85\u65f6\u3002\u8981\u5efa\u7acb \u201c\u7528\u54c8\u5e0c\u8868\u5206\u7ec4\u201d \u7684\u610f\u8bc6\u3002\u8bc6\u3002<\/p>\n<li>\n<p>\u5ffd\u7565\u8fb9\u754c\u6761\u4ef6&#xff1a;\u7a7a\u5b57\u7b26\u4e32\u3001\u957f\u5ea6\u4e3a 1 \u7684\u5b57\u7b26\u4e32\u3001\u5168\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u7b49\u8fb9\u754c\u60c5\u51b5\u8981\u8003\u8651\u5230\u3002<\/p>\n<\/li>\n<li>\n<p>\u7f16\u7801\u6b67\u4e49\u95ee\u9898&#xff1a;\u8ba1\u6570\u7f16\u7801\u65f6\u5fd8\u8bb0\u52a0\u5206\u9694\u7b26&#xff0c;\u5bfc\u81f4\u4e0d\u540c\u8ba1\u6570\u4ea7\u751f\u76f8\u540c key&#xff0c;\u8fd9\u662f\u9690\u853d\u7684 bug\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e0d\u505a\u957f\u5ea6\u526a\u679d&#xff1a;242 \u9898\u4e2d\u5fd8\u8bb0\u5148\u6bd4\u8f83\u957f\u5ea6&#xff0c;\u867d\u7136\u7ed3\u679c\u4e0d\u9519&#xff0c;\u4f46\u5c11\u4e86\u4e00\u4e2a\u91cd\u8981\u7684\u4f18\u5316\u70b9\u3002<\/p>\n<\/li>\n<h4>4.3 \u6211\u7684\u5237\u9898\u65b9\u6cd5\u5206\u4eab<\/h4>\n<li>\n<p>\u5148\u66b4\u529b\u518d\u4f18\u5316&#xff1a;\u5148\u60f3\u6e05\u695a\u6700\u6734\u7d20\u7684\u89e3\u6cd5&#xff08;\u5373\u4f7f\u4f1a\u8d85\u65f6&#xff09;&#xff0c;\u518d\u9010\u6b65\u4f18\u5316&#xff0c;\u8fd9\u6837\u80fd\u66f4\u597d\u5730\u7406\u89e3\u4f18\u5316\u7684\u672c\u8d28\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e00\u9898\u591a\u89e3&#xff1a;\u6bcf\u9053\u9898\u81f3\u5c11\u60f3\u4e24\u79cd\u89e3\u6cd5&#xff0c;\u6bd4\u8f83\u4f18\u52a3&#xff0c;\u62d3\u5bbd\u601d\u8def\u3002\u6bd4\u5982\u8fd9\u4e24\u9898\u90fd\u6709\u6392\u5e8f\u6cd5\u548c\u8ba1\u6570\u6cd5\u3002<\/p>\n<\/li>\n<li>\n<p>\u5f52\u7c7b\u603b\u7ed3&#xff1a;\u505a\u5b8c\u9898\u540e\u60f3\u60f3\u8fd9\u9053\u9898\u5c5e\u4e8e\u4ec0\u4e48\u7c7b\u578b&#xff0c;\u548c\u4e4b\u524d\u505a\u8fc7\u7684\u54ea\u4e9b\u9898\u601d\u8def\u76f8\u4f3c&#xff0c;\u5efa\u7acb\u77e5\u8bc6\u7f51\u7edc\u3002<\/p>\n<\/li>\n<li>\n<p>\u5199\u5237\u9898\u65e5\u5fd7&#xff1a;\u628a\u89e3\u9898\u601d\u8def\u3001\u8e29\u5751\u70b9\u3001\u4f18\u5316\u8fc7\u7a0b\u8bb0\u5f55\u4e0b\u6765&#xff0c;\u4e0d\u4ec5\u52a0\u6df1\u5370\u8c61&#xff0c;\u4e5f\u65b9\u4fbf\u65e5\u540e\u590d\u4e60\u3002<\/p>\n<\/li>\n<hr \/>\n<h3>\u4e94\u3001\u603b\u7ed3<\/h3>\n<p>\u672c\u6587\u8be6\u7ec6\u8bb2\u89e3\u4e86 LeetCode 242&#xff08;\u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd&#xff09;\u548c 49&#xff08;\u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4&#xff09;\u4e24\u9053\u7ecf\u5178\u9898\u76ee&#xff1a;<\/p>\n<p>242 \u9898&#xff1a;\u6838\u5fc3\u662f\u7528\u6570\u7ec4\u8ba1\u6570\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u9891\u7387&#xff0c;\u65f6\u95f4 O(n)&#xff0c;\u7a7a\u95f4 O(1)&#xff0c;\u662f\u54c8\u5e0c\u8868\u601d\u60f3\u7684\u57fa\u7840\u5e94\u7528\u3002\u7528\u3002<\/p>\n<ul>\n<li>\n<p>49 \u9898&#xff1a;\u6838\u5fc3\u662f\u63d0\u53d6\u6bcf\u4e2a\u5b57\u7b26\u4e32\u7684\u7279\u5f81&#xff08;\u6392\u5e8f\u7ed3\u679c\u6216\u8ba1\u6570\u7f16\u7801&#xff09;\u4f5c\u4e3a\u54c8\u5e0c\u8868\u7684 key \u8fdb\u884c\u5206\u7ec4&#xff0c;\u65f6\u95f4 O (n\u00d7k) \u6216 O (n\u00d7k log k)&#xff0c;\u662f\u54c8\u5e0c\u5206\u7ec4\u601d\u60f3\u7684\u5178\u578b\u5e94\u7528\u3002<\/p>\n<\/li>\n<li>\n<p>\u4e24\u9898\u5173\u7cfb&#xff1a;49 \u9898\u662f 242 \u9898\u7684\u63a8\u5e7f&#xff0c;\u4ece \u201c\u5224\u65ad\u4e24\u4e2a\u201d \u5347\u7ea7\u4e3a \u201c\u5206\u7ec4\u591a\u4e2a\u201d&#xff0c;\u4f53\u73b0\u4e86\u54c8\u5e0c\u8868\u4ece\u6bd4\u8f83\u5230\u5206\u7ec4\u7684\u601d\u7ef4\u8dc3\u8fc1\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u8fd9\u4e24\u9053\u9898\u662f\u9762\u8bd5\u9ad8\u9891\u9898&#xff0c;\u4e5f\u662f\u638c\u63e1\u54c8\u5e0c\u8868\u7684\u5fc5\u5237\u9898\u3002\u5e0c\u671b\u8fd9\u7bc7\u65e5\u5fd7\u80fd\u5e2e\u52a9\u4f60\u7406\u89e3\u5176\u4e2d\u7684\u601d\u60f3&#xff0c;\u4e5f\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u4ea4\u6d41\u4f60\u7684\u89e3\u6cd5\u548c\u5fc3\u5f97&#xff01;<\/p>\n<hr \/>\n<p>\u4e0b\u4e00\u7bc7\u9884\u544a<\/p>\n<p>&#xff1a;\u7ee7\u7eed\u54c8\u5e0c\u8868\u4e13\u9898&#xff0c;\u5c06\u8bb2\u89e3\u3010283.\u79fb\u52a8\u96f6\u3011\u548c\u301011.\u76db\u6700\u591a\u6c34\u7684\u5bb9\u5668\u3011&#xff0c;\u656c\u8bf7\u671f\u5f85&#xff01; \u5982\u679c\u672c\u6587\u5bf9\u4f60\u6709\u5e2e\u52a9&#xff0c;\u6b22\u8fce\u70b9\u8d5e &#x1f44d;\u3001\u6536\u85cf \u2b50\u3001\u5173\u6ce8\u6211&#xff0c;\u4e00\u8d77\u5728\u7b97\u6cd5\u4e4b\u8def\u4e0a\u8fdb\u6b65&#xff01;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3010LeetCode \u5237\u9898\u65e5\u5fd7\u3011\u54c8\u5e0c\u8868\u7ecf\u5178\u53cc\u9898&#xff1a;242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd &amp; 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4&#xff08;C \u8be6\u89e3&#xff09; \u672c\u6587\u662f\u6211\u7684 LeetCode \u5237\u9898\u65e5\u5fd7\u7cfb\u5217\u4e4b\u4e00&#xff0c;\u7528 C \u8bed\u8a00\u6df1\u5165\u8bb2\u89e3\u4e24\u9053\u7ecf\u5178\u7684\u54c8\u5e0c\u8868\u9898\u76ee \u2014\u2014 242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd \u548c 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4 \u3002\u8fd9\u4e24\u9898\u4e00\u8109\u76f8\u627f&#xff0c;\u662f\u9762\u8bd5\u9ad8\u9891\u9898&#xff0c;\u4e5f\u662f\u638c\u63e1\u54c8\u5e0c\u8868\u601d\u60f3\u7684\u7edd\u4f73\u5165\u95e8\u7ec4\u5408\u3002\u6587\u7ae0\u5305\u542b\u5b8c\u6574\u7684\u9898\u76ee\u63cf\u8ff0\u3001\u591a\u79cd\u89e3\u9898\u601d\u8def\u3001C \u4ee3\u7801\u5b9e\u73b0\u3001\u590d\u6742\u5ea6\u5206\u6790\u3001<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,2692,3520,2872],"topic":[],"class_list":["post-103574","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-leetcode","tag-3520","tag-2872"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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\u5237\u9898\u65e5\u5fd7\u3011\u54c8\u5e0c\u8868\u7ecf\u5178\u53cc\u9898&#xff1a;242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd &amp; 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4&#xff08;C \u8be6\u89e3&#xff09; \u672c\u6587\u662f\u6211\u7684 LeetCode \u5237\u9898\u65e5\u5fd7\u7cfb\u5217\u4e4b\u4e00&#xff0c;\u7528 C \u8bed\u8a00\u6df1\u5165\u8bb2\u89e3\u4e24\u9053\u7ecf\u5178\u7684\u54c8\u5e0c\u8868\u9898\u76ee \u2014\u2014 242. \u6709\u6548\u7684\u5b57\u6bcd\u5f02\u4f4d\u8bcd \u548c 49. \u5b57\u6bcd\u5f02\u4f4d\u8bcd\u5206\u7ec4 \u3002\u8fd9\u4e24\u9898\u4e00\u8109\u76f8\u627f&#xff0c;\u662f\u9762\u8bd5\u9ad8\u9891\u9898&#xff0c;\u4e5f\u662f\u638c\u63e1\u54c8\u5e0c\u8868\u601d\u60f3\u7684\u7edd\u4f73\u5165\u95e8\u7ec4\u5408\u3002\u6587\u7ae0\u5305\u542b\u5b8c\u6574\u7684\u9898\u76ee\u63cf\u8ff0\u3001\u591a\u79cd\u89e3\u9898\u601d\u8def\u3001C \u4ee3\u7801\u5b9e\u73b0\u3001\u590d\u6742\u5ea6\u5206\u6790\u3001\" \/>\n<meta property=\"og:url\" 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