{"id":88972,"date":"2019-07-28T13:43:12","date_gmt":"2019-07-28T05:43:12","guid":{"rendered":"http:\/\/4563.org\/?p=88972"},"modified":"2019-07-28T13:43:12","modified_gmt":"2019-07-28T05:43:12","slug":"%e7%ae%80%e6%98%8e%e5%bf%ab%e9%80%9f%e6%8e%92%e5%ba%8f%e5%86%99%e6%b3%95","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=88972","title":{"rendered":"\u7b80\u660e\u5feb\u901f\u6392\u5e8f\u5199\u6cd5"},"content":{"rendered":"
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\u7b80\u660e\u5feb\u901f\u6392\u5e8f\u5199\u6cd5 <\/h1>\n

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\u8cc7\u6df1\u5927\u4f6c : mightofcode <\/span> <\/i> 50<\/span> <\/div>\n
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\u5feb\u901f\u6392\u5e8f\u4ee3\u7801\u6709\u51e0\u4e2a\u5751\u9700\u8981\u6ce8\u610f\uff1a
1\uff0cpartition \u7684\u8fc7\u7a0b\u6bd4\u8f83\u590d\u6742\uff0c\u5f88\u5bb9\u6613\u51fa\u9519\uff0c\u67d0\u4e9b\u884c\u6570\u5f88\u77ed\u7684\u4ee3\u7801\u5f88\u7b80\u6d01\u4f46\u662f\u4e0d\u5bb9\u6613\u770b\u61c2\uff0c\u4e0d\u5982\u91c7\u7528\u7b80\u5355\u76f4\u89c2\u7684\u65b9\u6cd5\uff1a\u7528\u7b2c\u4e00\u4e2a\u5143\u7d20\u4f5c\u4e3a\u8f74\u3001partition \u7ed3\u675f\u4e4b\u540e\u518d\u628a\u8f74 swap \u5230\u4e2d\u95f4
2\uff0c\u9009\u8f74\u5982\u679c\u56fa\u5b9a\u9009\u7b2c\u4e00\u4e2a\uff0c\u53ef\u80fd\u8fdb\u5165 worst case\uff0c\u590d\u6742\u5ea6\u9000\u5316\u4e3a N2\uff0c\u4f7f\u7528\u968f\u673a\u9009\u8f74\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898
3\uff0c\u5982\u679c\u6709\u5927\u91cf\u91cd\u590d\u5143\u7d20\uff0c\u5feb\u901f\u6392\u5e8f\u540c\u6837\u4f1a\u9677\u5165 N2\uff0c\u6b64\u65f6\u9700\u8981\u4f7f\u7528\u4e09\u5411\u5feb\u901f\u6392\u5e8f\uff1a\u5c06\u6570\u7ec4\u5206\u4e3a\u5c0f\u4e8e\u3001\u7b49\u4e8e\u3001\u5927\u4e8e\u8f74\u7684\u4e09\u90e8\u5206\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e24\u6b65 partition \u6765\u5b8c\u6210\uff1a\u9996\u5148\u5206\u4e3a\u5c0f\u4e8e\u7b49\u4e8e\u3001\u5927\u4e8e\u7684\u4e24\u90e8\u5206\uff0c\u7136\u540e\u518d\u8fdb\u884c\u4e00\u6b21 partition\uff0c\u62c6\u5206\u6210\u4e09\u90e8\u5206\u3002<\/p>\n

package com.mocyx.algs.sort;  import java.util.Random; import java.util.Scanner;  \/**  * @author Administrator  *\/ public class FastSort {     static int[] arrs;     static void swap(int a, int b) {         int v = arrs[a];         arrs[a] = arrs[b];         arrs[b] = v;     }      static Random random = new Random(System.currentTimeMillis());      static void choosePovit(int s, int e) {         int m = s + random.nextInt(e - s);         swap(s, m);     }      \/**      * @param s      * @param e      * @param leftEqual true \u8868\u793a\u628a\u76f8\u7b49\u7684\u653e\u5728\u5de6\u8fb9\uff0cfalse \u8868\u793a\u628a\u76f8\u7b49\u7684\u653e\u5728\u53f3\u8fb9      * @return      *\/     static int partition(int s, int e, boolean leftEqual) {          int i = s + 1;         int j = e;         int pivotValue = arrs[s];         while (true) {             if (leftEqual) {                 while (i <= e && arrs[i] <= pivotValue) {                     i += 1;                 }                 while (j >= s + 1 && arrs[j] > pivotValue) {                     j -= 1;                 }             } else {                 while (i <= e && arrs[i] < pivotValue) {                     i += 1;                 }                 while (j >= s + 1 && arrs[j] >= pivotValue) {                     j -= 1;                 }             }             if (i <= e && j >= s + 1 && i <= j) {                 swap(i, j);                 i += 1;                 j -= 1;             }else {                 break;             }         }         swap(s, i - 1);         return i - 1;     }      static void sort(int s, int e, int depth) {         if (s >= e) {             return;         }         \/\/\u968f\u673a\u9009\u62e9\u8f74\uff0c\u907f\u514d\u8fdb\u5165 worst case         choosePovit(s, e);         \/\/\u7b2c\u4e00\u6b21 partition\uff0c\u5c0f\u4e8e\u7b49\u4e8e\u8f74\u7684\u7f6e\u6362\u5230\u8f74\u53f3\u8fb9         int mr = partition(s, e, true);         \/\/\u7b2c\u4e8c\u6b21 partition\uff0c\u628a\u7b49\u4e8e\u8f74\u7684\u7f6e\u6362\u5230\u53f3\u4fa7         swap(s, mr);         int ml = partition(s, mr, false);         \/\/\u73b0\u5728\u6570\u7ec4\u5206\u4e3a\u4e09\u5757\uff1a\u5c0f\u4e8e\u8f74 \u7b49\u4e8e\u8f74 \u5927\u4e8e\u8f74\u7684         sort(s, ml - 1, depth + 1);         sort(mr + 1, e, depth + 1);     }      public static void main(String[] args) {         Scanner scanner = new Scanner(System.in);         int c = scanner.nextInt();         arrs = new int[c];         for (int i = 0; i < c; i++) {             arrs[i] = scanner.nextInt();         }         sort(0, arrs.length - 1, 1);         StringBuilder stringBuilder = new StringBuilder();         for (int i = 0; i < arrs.length; i++) {             stringBuilder.append(String.format(\"%d \", arrs[i]));         }         System.out.print(stringBuilder.toString());     } }  <\/code><\/pre>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (7<\/span>)        <\/div>\n
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     \u8cc7\u6df1\u5927\u4f6c : justyy <\/span>  <\/div>\n
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                                                                 \u5199\u5f97\u592a\u590d\u6742\u4e86
    https:\/\/helloacm.com\/?s=quicksort                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : mightofcode <\/span>  <\/div>\n
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                                                                 @justyy \u5b66\u4e60\u4e86\uff0c\u4f60\u8d34\u7684\u4ee3\u7801\u6bd4\u8f83\u7b80\u6d01
    \u4e0d\u8fc7\u6211\u66f4\u559c\u6b22\u53ef\u8bfb\u6027\u66f4\u597d\uff08\u4f46\u662f\u66f4\u590d\u6742\uff09\u7684\u7248\u672c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : hobochen <\/span>  <\/div>\n
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                                                                 “`haskell
    qsort [] = []
    qsort (x:xs) = qsort [y | y <- xs, y < x] ++ [x] ++ qsort [y | y <- xs, y >= x]
    “`
    \u6211\u548b\u6ca1\u89c9\u5f97\u77ed\u4f1a\u5f71\u54cd\u53ef\u8bfb\u6027\u5462\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : KentY <\/span>  <\/div>\n
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                                                                 \u5f88\u591a\u5e74\u524d\u5237\u8fc7\u4e00\u904d
    https:\/\/github.com\/sk1418\/jalgorithm\/blob\/master\/src\/main\/java\/com\/kent\/algorithm\/sorting\/QuickSort.java                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u8cc7\u6df1\u5927\u4f6c : jorneyr <\/span>  <\/div>\n
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                                                                 \u5927\u591a\u6570\u7684\u5feb\u6392\u7528\u7684\u662f\u53cc\u8fb9\u5faa\u73af\u6cd5\uff0c\u5355\u8fb9\u5faa\u73af\u6cd5\u7684\u5feb\u901f\u6392\u5e8f\u6700\u7b80\u6d01\u6613\u61c2                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : mightofcode <\/span>  <\/div>\n
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                                                                 @jorneyr \u5b66\u5230\u4e86\uff0c\u5355\u8fb9\u5faa\u73af\u6cd5\u592a\u5de7\u5999\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
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     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : mightofcode <\/span>  <\/div>\n
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                                                                 @hobochen haskell \u5f88\u4f18\u7f8e                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u7b80\u660e\u5feb\u901f\u6392\u5e8f\u5199\u6cd5 \u8cc7\u6df1\u5927\u4f6c : m…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/88972"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=88972"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/88972\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=88972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=88972"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=88972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}