{"id":48372,"date":"2025-07-30T11:42:30","date_gmt":"2025-07-30T03:42:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/48372.html"},"modified":"2025-07-30T11:42:30","modified_gmt":"2025-07-30T03:42:30","slug":"%e7%ae%97%e6%b3%95%e9%a2%98-%e5%ad%98%e5%9c%a8%e9%87%8d%e5%a4%8d%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/48372.html","title":{"rendered":"\u7b97\u6cd5\u9898 \u5b58\u5728\u91cd\u590d\u5143\u7d20"},"content":{"rendered":"<h2>217. \u5b58\u5728\u91cd\u590d\u5143\u7d20<\/h2>\n<h3>\u95ee\u9898\u63cf\u8ff0<\/h3>\n<p>\u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums&#xff0c;\u5224\u65ad\u5176\u4e2d\u662f\u5426\u5b58\u5728\u91cd\u590d\u5143\u7d20\u3002\u5982\u679c\u5b58\u5728\u91cd\u590d\u5143\u7d20&#xff0c;\u8fd4\u56de true&#xff1b;\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p>\u793a\u4f8b 1&#xff1a;<\/p>\n<p>\u8f93\u5165&#xff1a;nums &#061; [1,2,3,1]<\/p>\n<p>\u8f93\u51fa&#xff1a;true<\/p>\n<p>\u89e3\u91ca&#xff1a;<\/p>\n<p>\u5143\u7d20 1 \u5728\u4e0b\u6807 0 \u548c 3 \u51fa\u73b0\u3002<\/p>\n<p>\u793a\u4f8b 2&#xff1a;<\/p>\n<p>\u8f93\u5165&#xff1a;nums &#061; [1,2,3,4]<\/p>\n<p>\u8f93\u51fa&#xff1a;false<\/p>\n<p>\u89e3\u91ca&#xff1a;<\/p>\n<p>\u6240\u6709\u5143\u7d20\u90fd\u4e0d\u540c\u3002<\/p>\n<p>\u793a\u4f8b 3&#xff1a;<\/p>\n<p>\u8f93\u5165&#xff1a;nums &#061; [1,1,1,3,3,4,3,2,4,2]<\/p>\n<p>\u8f93\u51fa&#xff1a;true<\/p>\n<h3>\u7b97\u6cd5\u601d\u8def<\/h3>\n<h4>\u65b9\u6cd5\u4e00&#xff1a;\u54c8\u5e0c\u96c6\u5408&#xff08;Set&#xff09;<\/h4>\n<li>\u4f7f\u7528\u4e00\u4e2a HashSet \u6765\u5b58\u50a8\u5df2\u7ecf\u904d\u5386\u8fc7\u7684\u5143\u7d20<\/li>\n<li>\u904d\u5386\u6570\u7ec4&#xff0c;\u5bf9\u6bcf\u4e2a\u5143\u7d20\u8fdb\u884c\u5224\u65ad&#xff1a;\n<ul>\n<li>\u5982\u679c\u8be5\u5143\u7d20\u5df2\u5b58\u5728\u4e8e\u96c6\u5408\u4e2d \u2192 \u5b58\u5728\u91cd\u590d&#xff0c;\u8fd4\u56de true<\/li>\n<li>\u5426\u5219\u5c06\u5176\u52a0\u5165\u96c6\u5408\u7ee7\u7eed\u904d\u5386<\/li>\n<\/ul>\n<\/li>\n<li>\u904d\u5386\u7ed3\u675f\u540e\u672a\u53d1\u73b0\u91cd\u590d \u2192 \u8fd4\u56de false<\/li>\n<p>\u4f18\u70b9&#xff1a;\u65f6\u95f4\u6548\u7387\u9ad8&#xff0c;\u903b\u8f91\u6e05\u6670<br \/>\n\u9002\u7528\u573a\u666f&#xff1a;\u901a\u7528\u89e3\u6cd5&#xff0c;\u9002\u5408\u5927\u591a\u6570\u60c5\u51b5<\/p>\n<h4>\u65b9\u6cd5\u4e8c&#xff1a;\u6392\u5e8f\u540e\u6bd4\u8f83\u76f8\u90bb\u5143\u7d20<\/h4>\n<li>\u5148\u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f<\/li>\n<li>\u904d\u5386\u6392\u5e8f\u540e\u7684\u6570\u7ec4&#xff0c;\u6bd4\u8f83\u76f8\u90bb\u4e24\u4e2a\u5143\u7d20\u662f\u5426\u76f8\u7b49<\/li>\n<li>\u82e5\u53d1\u73b0\u76f8\u7b49\u7684\u76f8\u90bb\u5143\u7d20 \u2192 \u5b58\u5728\u91cd\u590d&#xff0c;\u8fd4\u56de true<\/li>\n<li>\u904d\u5386\u7ed3\u675f\u672a\u53d1\u73b0\u91cd\u590d \u2192 \u8fd4\u56de false<\/li>\n<p>\u4f18\u70b9&#xff1a;\u7a7a\u95f4\u590d\u6742\u5ea6\u66f4\u4f4e&#xff08;\u539f\u5730\u64cd\u4f5c&#xff09;<br \/>\n\u7f3a\u70b9&#xff1a;\u4fee\u6539\u4e86\u539f\u6570\u7ec4\u7ed3\u6784&#xff0c;\u4e0d\u9002\u7528\u4e8e\u4e0d\u5141\u8bb8\u4fee\u6539\u8f93\u5165\u7684\u573a\u666f<\/p>\n<h3>\u4ee3\u7801\u5b9e\u73b0<\/h3>\n<h4>\u65b9\u6cd5\u4e00&#xff1a;\u4f7f\u7528 HashSet \u5224\u65ad\u91cd\u590d&#xff08;\u63a8\u8350\u89e3\u6cd5&#xff09;<\/h4>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">HashSet<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">;<\/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 comment\">\/**<br \/>\n     * \u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u91cd\u590d\u5143\u7d20&#xff08;\u4f7f\u7528HashSet&#xff09;<br \/>\n     *<br \/>\n     * \u6838\u5fc3\u601d\u60f3&#xff1a;\u5229\u7528HashSet\u7684\u552f\u4e00\u6027\u7279\u6027&#xff0c;<br \/>\n     * \u5728\u6dfb\u52a0\u5143\u7d20\u65f6\u81ea\u52a8\u68c0\u6d4b\u662f\u5426\u5df2\u5b58\u5728\u76f8\u540c\u5143\u7d20\u3002<br \/>\n     *<br \/>\n     * &#064;param nums \u6574\u6570\u6570\u7ec4<br \/>\n     * &#064;return \u5b58\u5728\u91cd\u590d\u8fd4\u56detrue&#xff0c;\u5426\u5219\u8fd4\u56defalse<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u521b\u5efaHashSet\u7528\u4e8e\u5b58\u50a8\u5df2\u904d\u5386\u7684\u5143\u7d20<\/span><br \/>\n        <span class=\"token comment\">\/\/ HashSet\u7279\u70b9&#xff1a;\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20&#xff0c;\u67e5\u627e\u548c\u63d2\u5165\u5747\u4e3aO(1)<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> seen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashSet<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u904d\u5386\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> num <span class=\"token operator\">:<\/span> nums<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5c06\u5f53\u524d\u5143\u7d20\u52a0\u5165HashSet<\/span><br \/>\n            <span class=\"token comment\">\/\/ add()\u65b9\u6cd5\u8fd4\u56deboolean\u503c&#xff1a;<\/span><br \/>\n            <span class=\"token comment\">\/\/ &#8211; \u5982\u679c\u5143\u7d20\u4e0d\u5b58\u5728\u5219\u6dfb\u52a0\u6210\u529f&#xff0c;\u8fd4\u56detrue<\/span><br \/>\n            <span class=\"token comment\">\/\/ &#8211; \u5982\u679c\u5143\u7d20\u5df2\u5b58\u5728\u5219\u6dfb\u52a0\u5931\u8d25&#xff0c;\u8fd4\u56defalse<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>seen<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u6dfb\u52a0\u5931\u8d25\u8bf4\u660e\u8be5\u5143\u7d20\u5df2\u7ecf\u5b58\u5728 \u2192 \u53d1\u73b0\u91cd\u590d<\/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 comment\">\/\/ \u5982\u679c\u6dfb\u52a0\u6210\u529f&#xff0c;\u7ee7\u7eed\u5904\u7406\u4e0b\u4e00\u4e2a\u5143\u7d20<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6240\u6709\u5143\u7d20\u90fd\u6210\u529f\u6dfb\u52a0&#xff0c;\u8bf4\u660e\u6ca1\u6709\u91cd\u590d\u5143\u7d20<\/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><\/p>\n<h4>\u65b9\u6cd5\u4e8c&#xff1a;\u6392\u5e8f\u540e\u68c0\u67e5\u76f8\u90bb\u5143\u7d20&#xff08;\u7a7a\u95f4\u4f18\u5316\u89e3\u6cd5&#xff09;<\/h4>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/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 comment\">\/**<br \/>\n     * \u5224\u65ad\u6570\u7ec4\u4e2d\u662f\u5426\u5b58\u5728\u91cd\u590d\u5143\u7d20&#xff08;\u6392\u5e8f\u6cd5&#xff09;<br \/>\n     *<br \/>\n     * \u6838\u5fc3\u601d\u60f3&#xff1a;\u6392\u5e8f\u540e\u91cd\u590d\u5143\u7d20\u5fc5\u5b9a\u76f8\u90bb&#xff0c;<br \/>\n     * \u53ea\u9700\u4e00\u6b21\u904d\u5386\u68c0\u67e5\u76f8\u90bb\u5143\u7d20\u5373\u53ef\u3002<br \/>\n     *<br \/>\n     * \u6ce8\u610f&#xff1a;\u6b64\u65b9\u6cd5\u4f1a\u6539\u53d8\u539f\u6570\u7ec4\u987a\u5e8f<br \/>\n     *<br \/>\n     * &#064;param nums \u6574\u6570\u6570\u7ec4<br \/>\n     * &#064;return \u5b58\u5728\u91cd\u590d\u8fd4\u56detrue&#xff0c;\u5426\u5219\u8fd4\u56defalse<br \/>\n     *\/<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6392\u5e8f\u540e\u76f8\u540c\u7684\u5143\u7d20\u4f1a\u805a\u96c6\u5728\u4e00\u8d77<\/span><br \/>\n        <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>nums<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u904d\u5386\u6392\u5e8f\u540e\u7684\u6570\u7ec4&#xff0c;\u68c0\u67e5\u76f8\u90bb\u5143\u7d20<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4ece\u7d22\u5f151\u5f00\u59cb&#xff0c;\u6bd4\u8f83\u5f53\u524d\u5143\u7d20\u4e0e\u524d\u4e00\u4e2a\u5143\u7d20<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> nums<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5982\u679c\u5f53\u524d\u5143\u7d20\u7b49\u4e8e\u524d\u4e00\u4e2a\u5143\u7d20 \u2192 \u5b58\u5728\u91cd\u590d<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>nums<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;&#061;<\/span> nums<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> <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><\/p>\n<p>        <span class=\"token comment\">\/\/ \u904d\u5386\u5b8c\u6210\u672a\u53d1\u73b0\u76f8\u90bb\u91cd\u590d\u5143\u7d20 \u2192 \u65e0\u91cd\u590d<\/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><\/p>\n<h3>\u7b97\u6cd5\u5206\u6790<\/h3>\n<ul>\n<li>\n<p>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;<\/p>\n<ul>\n<li>\u65b9\u6cd5\u4e00&#xff08;HashSet&#xff09;&#xff1a;O(n)\n<ul>\n<li>\u904d\u5386\u6570\u7ec4\u4e00\u6b21&#xff1a;O(n)<\/li>\n<li>HashSet\u7684add\u64cd\u4f5c\u5e73\u5747O(1)<\/li>\n<\/ul>\n<\/li>\n<li>\u65b9\u6cd5\u4e8c&#xff08;\u6392\u5e8f&#xff09;&#xff1a;O(n log n)\n<ul>\n<li>\u6392\u5e8f\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;O(n log n)<\/li>\n<li>\u904d\u5386\u68c0\u67e5\u76f8\u90bb\u5143\u7d20&#xff1a;O(n)<\/li>\n<li>\u603b\u4f53\u7531\u6392\u5e8f\u4e3b\u5bfc<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;<\/p>\n<ul>\n<li>\u65b9\u6cd5\u4e00&#xff1a;O(n)\n<ul>\n<li>HashSet\u6700\u591a\u5b58\u50a8n\u4e2a\u5143\u7d20<\/li>\n<\/ul>\n<\/li>\n<li>\u65b9\u6cd5\u4e8c&#xff1a;O(1) \u6216 O(log n)\n<ul>\n<li>\u4e0d\u8003\u8651\u6392\u5e8f\u7684\u9012\u5f52\u6808\u7a7a\u95f4\u65f6\u4e3aO(1)<\/li>\n<li>\u5feb\u901f\u6392\u5e8f\/\u5f52\u5e76\u6392\u5e8f\u7684\u9012\u5f52\u8c03\u7528\u6808\u4e3aO(log n)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u65b9\u6cd5\u5bf9\u6bd4&#xff1a;<\/p>\n<table>\n<tr>\u65b9\u6cd5\u65f6\u95f4\u590d\u6742\u5ea6\u7a7a\u95f4\u590d\u6742\u5ea6\u662f\u5426\u4fee\u6539\u539f\u6570\u7ec4\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>HashSet<\/td>\n<td>O(n)<\/td>\n<td>O(n)<\/td>\n<td>\u5426<\/td>\n<td>\u901a\u7528\u63a8\u8350&#xff0c;\u6027\u80fd\u6700\u4f18<\/td>\n<\/tr>\n<tr>\n<td>\u6392\u5e8f\u6cd5<\/td>\n<td>O(n log n)<\/td>\n<td>O(1)\/O(log n)<\/td>\n<td>\u662f<\/td>\n<td>\u5185\u5b58\u53d7\u9650\u4e14\u5141\u8bb8\u4fee\u6539\u8f93\u5165<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<\/ul>\n<h3>\u7b97\u6cd5\u8fc7\u7a0b<\/h3>\n<p>\u8f93\u5165&#xff1a;nums &#061; [1,2,3,1]<\/p>\n<h4>\u65b9\u6cd5\u4e00&#xff1a;HashSet \u8fc7\u7a0b<\/h4>\n<li>\u521d\u59cb\u5316\u7a7aHashSet&#xff1a;seen &#061; {}<\/li>\n<li>num&#061;1&#xff1a;seen.add(1) \u2192 \u6210\u529f \u2192 seen&#061;{1}<\/li>\n<li>num&#061;2&#xff1a;seen.add(2) \u2192 \u6210\u529f \u2192 seen&#061;{1,2}<\/li>\n<li>num&#061;3&#xff1a;seen.add(3) \u2192 \u6210\u529f \u2192 seen&#061;{1,2,3}<\/li>\n<li>num&#061;1&#xff1a;seen.add(1) \u2192 \u5931\u8d25&#xff08;1\u5df2\u5b58\u5728&#xff09;\u2192 \u8fd4\u56de true<\/li>\n<h4>\u65b9\u6cd5\u4e8c&#xff1a;\u6392\u5e8f\u6cd5\u8fc7\u7a0b<\/h4>\n<li>\u6392\u5e8f\u524d&#xff1a;[1,2,3,1]<\/li>\n<li>\u6392\u5e8f\u540e&#xff1a;[1,1,2,3]<\/li>\n<li>\u904d\u5386\u68c0\u67e5\u76f8\u90bb\u5143\u7d20&#xff1a;\n<ul>\n<li>i&#061;1&#xff1a;nums[1]&#061;1, nums[0]&#061;1 \u2192 \u76f8\u7b49 \u2192 \u8fd4\u56de true<\/li>\n<\/ul>\n<\/li>\n<h3>\u6d4b\u8bd5\u7528\u4f8b<\/h3>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Solution<\/span> solution <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Solution<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b1&#xff1a;\u5b58\u5728\u91cd\u590d&#xff08;\u793a\u4f8b1&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums1 <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\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 1: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b2&#xff1a;\u65e0\u91cd\u590d&#xff08;\u793a\u4f8b2&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums2 <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 punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 2: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b3&#xff1a;\u4e24\u4e2a\u76f8\u540c\u5143\u7d20<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums3 <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 punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 3: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b4&#xff1a;\u5355\u5143\u7d20<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums4 <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 punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 4: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b5&#xff1a;\u7a7a\u6570\u7ec4<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums5 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 5: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums5<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b6&#xff1a;\u591a\u4e2a\u91cd\u590d<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums6 <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\">2<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 6: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums6<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b7&#xff1a;\u8d1f\u6570\u91cd\u590d<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums7 <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><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 class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 7: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums7<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ true<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u7528\u4f8b8&#xff1a;\u5927\u6570\u7ec4\u65e0\u91cd\u590d<\/span><br \/>\n    <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> nums8 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/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\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        nums8<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Test 8: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> solution<span class=\"token punctuation\">.<\/span><span class=\"token function\">containsDuplicate<\/span><span class=\"token punctuation\">(<\/span>nums8<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ false<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u5173\u952e\u70b9<\/h3>\n<li>\n<p>HashSet \u7684\u4f7f\u7528&#xff1a;<\/p>\n<ul>\n<li>add() \u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u76f4\u63a5\u53cd\u6620\u4e86\u5143\u7d20\u662f\u5426\u5df2\u5b58\u5728<\/li>\n<li>\u907f\u514d\u4e86\u5148\u8c03\u7528 contains() \u518d\u8c03\u7528 add() \u7684\u4e24\u6b21\u64cd\u4f5c<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u65e9\u671f\u7ec8\u6b62&#xff1a;<\/p>\n<ul>\n<li>\u4e00\u65e6\u53d1\u73b0\u91cd\u590d\u7acb\u5373\u8fd4\u56de&#xff0c;\u65e0\u9700\u904d\u5386\u5b8c\u6574\u4e2a\u6570\u7ec4<\/li>\n<li>\u6700\u597d\u60c5\u51b5\u4e0b\u65f6\u95f4\u590d\u6742\u5ea6\u53ef\u8fbe\u5230 O(1)<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6392\u5e8f\u6cd5\u7684\u672c\u8d28&#xff1a;<\/p>\n<ul>\n<li>\u5c06&#034;\u5168\u5c40\u91cd\u590d\u68c0\u6d4b&#034;\u95ee\u9898\u8f6c\u5316\u4e3a&#034;\u5c40\u90e8\u76f8\u90bb\u6bd4\u8f83&#034;\u95ee\u9898<\/li>\n<li>\u5229\u7528\u6392\u5e8f\u4f7f\u91cd\u590d\u5143\u7d20\u805a\u96c6&#xff0c;\u7b80\u5316\u5224\u65ad\u903b\u8f91<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8fb9\u754c\u60c5\u51b5\u5904\u7406&#xff1a;<\/p>\n<ul>\n<li>\u7a7a\u6570\u7ec4\u6216\u5355\u5143\u7d20\u6570\u7ec4&#xff1a;\u4e0d\u53ef\u80fd\u6709\u91cd\u590d<\/li>\n<li>\u8d1f\u6570\u548c\u96f6&#xff1a;\u4e0d\u5f71\u54cd\u7b97\u6cd5\u903b\u8f91<\/li>\n<\/ul>\n<\/li>\n<h3>\u5e38\u89c1\u95ee\u9898<\/h3>\n<li>\n<p>\u4e3a\u4ec0\u4e48 HashSet \u65b9\u6cd5\u6bd4\u6392\u5e8f\u65b9\u6cd5\u5feb&#xff1f;<\/p>\n<ul>\n<li>HashSet \u65b9\u6cd5\u662f\u7ebf\u6027\u65f6\u95f4 O(n)&#xff0c;\u800c\u6392\u5e8f\u65b9\u6cd5\u662f O(n log n)<\/li>\n<li>\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e&#xff0c;log n 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