{"id":278413,"date":"2021-01-13T12:01:27","date_gmt":"2021-01-13T04:01:27","guid":{"rendered":"http:\/\/4563.org\/?p=278413"},"modified":"2021-01-13T12:01:27","modified_gmt":"2021-01-13T04:01:27","slug":"%e6%98%a8%e5%a4%a9%e5%88%b7%e7%9a%84%e8%bf%99%e9%a2%98%e8%bf%98%e7%9c%9f%e4%b8%8d%e9%94%99%ef%bc%8c-two-pointers-%e7%bb%8f%e5%85%b8%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=278413","title":{"rendered":"\u6628\u5929\u5237\u7684\u8fd9\u9898\u8fd8\u771f\u4e0d\u9519\uff0c two pointers \u7ecf\u5178\u9898"},"content":{"rendered":"
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\u6628\u5929\u5237\u7684\u8fd9\u9898\u8fd8\u771f\u4e0d\u9519\uff0c two pointers \u7ecf\u5178\u9898 <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : zzzrf <\/span> <\/i> 1<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u63cf\u8ff0<\/h3>\n

\u7ed9\u51fa\u4e00\u4e2a\u6574\u6570\u6570\u7ec4 nums \u548c\u4e00\u4e2a\u6574\u6570 k \u3002\u5212\u5206\u6570\u7ec4\uff08\u5373\u79fb\u52a8\u6570\u7ec4 nums \u4e2d\u7684\u5143\u7d20\uff09\uff0c\u4f7f\u5f97\uff1a<\/p>\n

    \n
  • \u6240\u6709\u5c0f\u4e8e k \u7684\u5143\u7d20\u79fb\u5230\u5de6\u8fb9<\/li>\n
  • \u6240\u6709\u5927\u4e8e\u7b49\u4e8e k \u7684\u5143\u7d20\u79fb\u5230\u53f3\u8fb9<\/li>\n<\/ul>\n

    \u8fd4\u56de\u6570\u7ec4\u5212\u5206\u7684\u4f4d\u7f6e\uff0c\u5373\u6570\u7ec4\u4e2d\u7b2c\u4e00\u4e2a\u4f4d\u7f6e i\uff0c\u6ee1\u8db3 nums[i] \u5927\u4e8e\u7b49\u4e8e k \u3002<\/p>\n

    \u5728\u7ebf\u8bc4\u6d4b\u5730\u5740<\/p>\n

    \u6837\u4f8b 1<\/h3>\n
    \u8f93\u5165: [],9 \u8f93\u51fa: 0 <\/code><\/pre>\n
    \u6837\u4f8b 2<\/h3>\n
    \u8f93\u5165: [3,2,2,1],2 \u8f93\u51fa:1 \u89e3\u91ca: \u771f\u5b9e\u7684\u6570\u7ec4\u4e3a[1,2,2,3].\u6240\u4ee5\u8fd4\u56de 1 <\/code><\/pre>\n
    \u7b97\u6cd5\uff1a\u5feb\u901f\u9009\u62e9\u7b97\u6cd5<\/p>\n
    \u7b97\u6cd5\u601d\u8def<\/h3>\n
      \n
    • \n
      \u901a\u8fc7\u5934\u5c3e\u6307\u9488\u8df3\u8fc7\u5c0f\u4e8e k \u7684\u524d\u7f00\u548c\u5927\u4e8e\u7b49\u4e8e k \u7684\u540e\u7f00\uff0c\u53ef\u4ee5\u627e\u5230\u4e0e\u7b2c\u4e00\u4e2a\u5927\u4e8e\u7b49\u4e8e k \u7684\u503c\u548c\u6700\u540e\u4e00\u4e2a\u5c0f\u4e8e k \u7684\u503c\u3002\u8fdb\u884c\u4ea4\u6362\u540e\u53ef\u8fbe\u5230\u5212\u5206\u6570\u7ec4\u7684\u76ee\u7684\uff0c\u76f4\u5230\u627e\u5230\u4e24\u4e2a\u6307\u9488\u76f8\u9047\u4e3a\u6b62\u3002<\/p>\n<\/li>\n
    • \n
      \u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/li>\n
    • \n
      \u4ee4 left = 0\uff0cright = length-1 \u3002<\/p>\n<\/li>\n
    • \n
      \u5f53 nums[left] < k \u65f6\uff0cleft \u6307\u9488\u5411\u53f3\u79fb\u52a8\u3002<\/p>\n<\/li>\n
    • \n
      \u5f53 nums[right] >= k \u65f6\uff0cright \u6307\u9488\u5411\u5de6\u79fb\u52a8\u3002<\/p>\n<\/li>\n
    • \n
      \u5982\u679c left <= right\uff0c\u4ea4\u6362\u4e24\u4e2a\u503c\u3002<\/p>\n<\/li>\n
    • \n
      \u5982\u679c left > right\uff0c\u8fd4\u56de left \u4f5c\u4e3a\u6700\u7ec8\u7ed3\u679c\uff0c\u5426\u5219\u8fd4\u56de\u7b2c\u4e8c\u6b65\u3002<\/p>\n<\/li>\n<\/ul>\n
      \u590d\u6742\u5ea6\u5206\u6790<\/h3>\n
        \n
      • \n
        \u8bbe\u6570\u7ec4\u957f\u5ea6\u4e3a n<\/p>\n<\/li>\n
      • \n
        \u65f6\u95f4\u590d\u6742\u5ea6 O(n)<\/h2>\n<\/li>\n
      • \n
        \u6700\u591a\u626b\u63cf\u4e00\u904d\u6570\u7ec4\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a O(n)<\/p>\n<\/li>\n
      • \n
        \u7a7a\u95f4\u590d\u6742\u5ea6 O(1)<\/h2>\n<\/li>\n
      • \n
        \u53ea\u9700\u8981\u9009\u62e9\u7528\u7684\u6e38\u6807\u53d8\u91cf\u7684\u989d\u5916\u7a7a\u95f4\uff0c\u6240\u4ee5\u7a7a\u95f4\u590d\u6742\u5ea6\u4e3a O(1)<\/p>\n<\/li>\n<\/ul>\n
        public class Solution {     \/**      * @param nums: The integer array you should partition      * @param k: An integer      * @return: The index after partition      *\/     public int partitionArray(int[] nums, int k) {         if (nums == null) {             return 0;         }         int left = 0, right = nums.length - 1;         while (left <= right) {             while (left <= right && nums[left] < k) {                 left++;             }             while (left <= right && nums[right] >= k) {                 right--;             }              if (left <= right) {                 int temp = nums[left];                 nums[left] = nums[right];                 nums[right] = temp;                  left++;                 right--;             }         }         return left;     } } <\/code><\/pre>\n
        \u66f4\u591a\u9898\u89e3\u53c2\u8003<\/p>\n<\/p><\/div>\n
         \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>)        <\/div>\n
         <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
          \n
        • \n","protected":false},"excerpt":{"rendered":"
          \u6628\u5929\u5237\u7684\u8fd9\u9898\u8fd8\u771f\u4e0d\u9519\uff0c two p…<\/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\/278413"}],"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=278413"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/278413\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=278413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=278413"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=278413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}