{"id":51008,"date":"2025-08-10T16:09:23","date_gmt":"2025-08-10T08:09:23","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/51008.html"},"modified":"2025-08-10T16:09:23","modified_gmt":"2025-08-10T08:09:23","slug":"%e6%95%b0%e7%bb%84%e4%b8%ad%e7%9a%84%e7%ac%ack%e4%b8%aa%e6%9c%80%e5%a4%a7%e5%85%83%e7%b4%a0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/51008.html","title":{"rendered":"\u6570\u7ec4\u4e2d\u7684\u7b2cK\u4e2a\u6700\u5927\u5143\u7d20"},"content":{"rendered":"<p>\u9898\u76ee&#xff1a;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810080922-689853b213ab5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u601d\u80031&#xff1a;<\/p>\n<li>\u4f7f\u7528\u5806\u6392\u5e8f\u5b9e\u73b0<\/li>\n<li>\u5806\u6392\u5e8f\u6709\u4e24\u79cd\u601d\u8def&#xff1a;\n<li>\u4f7f\u7528\u5927\u6839\u5806&#xff0c;\u5c06\u6570\u7ec4\u6240\u6709\u5143\u7d20\u4f7f\u7528\u5927\u6839\u5806\u5efa\u5806&#xff0c;\u4f7f\u7528k-1\u6b21\u5806\u7684\u5220\u9664\u64cd\u4f5c\u540e\u7684\u5806\u9876\u5c31\u662f\u7d22\u8981\u5143\u7d20<\/li>\n<li>\u4f7f\u7528\u5c0f\u6839\u5806&#xff0c;\u5c06\u6570\u7ec4\u524dk\u4e2a\u5143\u7d20\u5efa\u7acb\u5c0f\u6839\u5806&#xff0c;\u904d\u5386\u6570\u7ec4\u4e2d\u5176\u4ed6\u5143\u7d20&#xff0c;\u82e5\u904d\u5386\u5230\u7684\u5143\u7d20\u5927\u4e8e\u5806\u9876\u5219\u5220\u9664\u5806\u9876\u5e76\u5c06\u8be5\u904d\u5386\u5230\u7684\u5143\u7d20\u52a0\u5165\u5806\u4e2d&#xff08;\u4e5f\u5c31\u662f\u8bf4\u59cb\u7ec8\u7ef4\u6301\u4e00\u4e2a\u5927\u5c0fk\u7684\u5c0f\u6839\u5806&#xff0c;\u5c0f\u6839\u5806\u91cc\u9762\u5b58\u50a8\u7684\u5143\u7d20\u968f\u7740\u904d\u5386\u8fc7\u7a0b\u7684\u8fdb\u884c\u4f1a\u4e0d\u65ad\u66f4\u65b0\u6210\u8f83\u5927\u7684\u5143\u7d20&#xff09;&#xff0c;\u904d\u5386\u5b8c\u6210\u540e\u5806\u9876\u5c31\u662f\u7b2ck\u5927\u5143\u7d20&#xff08;k-1\u4e2a\u66f4\u5927\u7684\u5143\u7d20\u90fd\u5728\u5806\u91cc\u9762\u4e86&#xff09;&#8212;&#8211;\u6bd4\u8d77\u5927\u6839\u5806\u6cd5\u7701\u4e0b\u4e00\u4e9b\u7a7a\u95f4~~<\/li>\n<\/li>\n<p>\u5b9e\u73b0\u91c7\u7528\u5c0f\u6839\u5806\u65b9\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token function\">adjust<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> heap<span class=\"token punctuation\">,<\/span><span class=\"token keyword\">int<\/span> t<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> max<span class=\"token operator\">&#061;<\/span>t<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">*<\/span>max<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;<\/span>heap<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><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\">int<\/span> l<span class=\"token operator\">&#061;<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">*<\/span>max<span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> r<span class=\"token operator\">&#061;<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">*<\/span>max<span class=\"token operator\">&#043;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r<span class=\"token operator\">&lt;<\/span>heap<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><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\">if<\/span> <span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>l<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&lt;<\/span>heap<span class=\"token punctuation\">[<\/span>r<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>l<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&lt;<\/span>heap<span class=\"token punctuation\">[<\/span>max<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>l<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>heap<span class=\"token punctuation\">[<\/span>max<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        max<span class=\"token operator\">&#061;<\/span>l<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">else<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">break<\/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\">else<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>r<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&lt;<\/span>heap<span class=\"token punctuation\">[<\/span>max<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>r<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>heap<span class=\"token punctuation\">[<\/span>max<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        max<span class=\"token operator\">&#061;<\/span>r<span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token keyword\">else<\/span><br \/>\n                    <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">break<\/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 punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">else<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>l<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&lt;<\/span>heap<span class=\"token punctuation\">[<\/span>max<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">[<\/span>l<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span>heap<span class=\"token punctuation\">[<\/span>max<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    max<span class=\"token operator\">&#061;<\/span>l<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token keyword\">else<\/span><br \/>\n                <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">break<\/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 punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token function\">findKthLargest<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> nums<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> k<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\">heap<\/span><span class=\"token punctuation\">(<\/span>nums<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>nums<span class=\"token punctuation\">.<\/span><span class=\"token function\">begin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span>k<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> max<span class=\"token operator\">&#061;<\/span>k<span class=\"token operator\">\/<\/span><span class=\"token number\">2<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span>max<span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&gt;&#061;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><span class=\"token operator\">&#8212;<\/span>i<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">adjust<\/span><span class=\"token punctuation\">(<\/span>heap<span class=\"token punctuation\">,<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i<span class=\"token operator\">&#061;<\/span>k<span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;<\/span>nums<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>i<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\">if<\/span> <span class=\"token punctuation\">(<\/span>nums<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token operator\">&gt;<\/span>heap<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 punctuation\">{<\/span><br \/>\n                heap<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">&#061;<\/span>nums<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">adjust<\/span><span class=\"token punctuation\">(<\/span>heap<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 punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> heap<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 punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u601d\u8003\u4e8c:<\/p>\n<li>\u867d\u8bf4\u5806\u6392\u5e8f\u7684\u601d\u8003\u548c\u5b9e\u73b0\u5df2\u7ecf\u86ee\u597d\u7684\u4e86&#xff0c;\u4f46\u4ecd\u7136\u672a\u6ee1\u8db3\u8981\u6c42<\/li>\n<li>\u5bf9\u4e8e\u65f6\u95f4\u590d\u6742\u5ea6\u4f4e\u7684\u6392\u5e8f&#xff0c;\u60f3\u5230\u5feb\u901f\u6392\u5e8f\u7684\u57fa\u4e8e\u54e8\u5175&#043;\u5212\u5206\u7684\u601d\u8def&#xff0c;\u7531\u4e8e\u5e76\u4e0d\u9700\u8981\u5b8c\u5168\u6392\u5e8f\u6574\u4e2a\u6570\u7ec4&#xff0c;\u53ef\u4ee5\u6839\u636e\u54e8\u5175\u548ck\u7684\u4f4d\u7f6e\u8fdb\u884c\u5feb\u901f\u9009\u62e9\u5b9a\u4f4d&#xff0c;\u663e\u8457\u964d\u4f4e\u65f6\u95f4\u590d\u6742\u5ea6<\/li>\n<li>\u6ce8\u610f\u5de8\u5751&#xff08;\u666e\u901a\u5212\u5206\u4f1a\u6709\u5f88\u591a\u91cd\u590d\u5143\u7d20\u4e0d\u7279\u6b8a\u5904\u7406\u4f1a\u5bfc\u81f4\u8d85\u65f6\u7684&#xff09;&#8212;&#8211;\u300b\u4e09\u8def\u5212\u5206<\/li>\n<p>\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Solution<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">public<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token function\">findKthLargest<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> nums<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> k<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">quickSelect<\/span><span class=\"token punctuation\">(<\/span>nums<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> nums<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> k<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token function\">quickSelect<\/span><span class=\"token punctuation\">(<\/span>vector<span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">int<\/span><span class=\"token operator\">&gt;<\/span><span class=\"token operator\">&amp;<\/span> nums<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> left<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> right<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> k<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>left <span class=\"token operator\">&#061;&#061;<\/span> right<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> nums<span class=\"token punctuation\">[<\/span>left<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p>        <span class=\"token keyword\">int<\/span> pivotIndex <span class=\"token operator\">&#061;<\/span> left <span class=\"token operator\">&#043;<\/span> <span class=\"token function\">rand<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">%<\/span> <span class=\"token punctuation\">(<\/span>right <span class=\"token operator\">&#8211;<\/span> left <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> pivot <span class=\"token operator\">&#061;<\/span> nums<span class=\"token punctuation\">[<\/span>pivotIndex<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> left<span class=\"token punctuation\">,<\/span> j <span class=\"token operator\">&#061;<\/span> right<span class=\"token punctuation\">,<\/span> p <span class=\"token operator\">&#061;<\/span> left<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">&lt;&#061;<\/span> j<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>nums<span class=\"token punctuation\">[<\/span>p<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> pivot<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">swap<\/span><span class=\"token punctuation\">(<\/span>nums<span class=\"token punctuation\">[<\/span>p<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> nums<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                p<span class=\"token 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