{"id":166863,"date":"2020-10-02T17:04:39","date_gmt":"2020-10-02T09:04:39","guid":{"rendered":"http:\/\/4563.org\/?p=166863"},"modified":"2020-10-02T17:04:39","modified_gmt":"2020-10-02T09:04:39","slug":"%e6%88%91%e8%83%a1%e6%b1%89%e4%b8%89%e5%8f%88%e5%9b%9e%e6%9d%a5%e5%88%b7%e9%a2%98%e4%ba%86%ef%bc%81-leetcode-lintcode-%e9%a2%98%e8%a7%a3%ef%bc%9a%e5%b1%b1%e8%84%89%e5%ba%8f%e5%88%97%e4%b8%ad%e7%9a%84","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=166863","title":{"rendered":"\u6211\u80e1\u6c49\u4e09\u53c8\u56de\u6765\u5237\u9898\u4e86\uff01 [LeetCode\/Lintcode \u9898\u89e3\uff1a\u5c71\u8109\u5e8f\u5217\u4e2d\u7684\u6700\u5927\u503c]"},"content":{"rendered":"
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\u6211\u80e1\u6c49\u4e09\u53c8\u56de\u6765\u5237\u9898\u4e86\uff01 [LeetCode\/Lintcode \u9898\u89e3\uff1a\u5c71\u8109\u5e8f\u5217\u4e2d\u7684\u6700\u5927\u503c] <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : zzzrf <\/span> <\/i> 4<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u56fd\u5e86\u5047\u671f\u7ed3\u675f\uff0c\u6765\u6536\u6536\u5fc3~<\/p>\n

\u7ed9 n \u4e2a\u6574\u6570\u7684\u5c71\u8109\u6570\u7ec4\uff0c\u5373\u5148\u589e\u540e\u51cf\u7684\u5e8f\u5217\uff0c\u627e\u5230\u5c71\u9876\uff08\u6700\u5927\u503c\uff09<\/p>\n

    \n
  • \u6570\u7ec4\u4e25\u683c\u9012\u589e\uff0c\u4e25\u683c\u9012\u51cf<\/li>\n<\/ul>\n

    \u70b9\u6b64\u5728\u7ebf\u505a\u9898<\/p>\n

    \u4f8b 1:<\/h2>\n
    \u8f93\u5165: nums = [1, 2, 4, 8, 6, 3]  \u8f93\u51fa: 8 <\/code><\/pre>\n
    \u4f8b 2:<\/h2>\n
    \u8f93\u5165: nums = [10, 9, 8, 7],  \u8f93\u51fa: 10 <\/code><\/pre>\n
    \u7b97\u6cd5\uff1a\u4e8c\u5206<\/h2>\n
    \u7b97\u6cd5\u601d\u8def<\/h3>\n
      \n
    • \u7531\u4e8e\u672c\u9898\u6570\u636e\u662f\u5177\u6709\u90e8\u5206\u5355\u8c03\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u8003\u8651\u7528\u4e8c\u5206\u6cd5\u6765\u89e3\u51b3<\/li>\n
    • \u5e76\u4e14\u672c\u9898\u4fdd\u8bc1\u6570\u7ec4\u4e25\u683c\u9012\u589e\u6216\u4e25\u683c\u9012\u51cf\uff0c\u6240\u4ee5\u76f8\u90bb\u4e24\u4e2a\u6570\u5fc5\u4e0d\u76f8\u7b49<\/li>\n
    • \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 a[mid]\u548c a[mid+1]\u7684\u5927\u5c0f\u5173\u7cfb\u6765\u5224\u65ad mid \u662f\u5728\u5de6\u4fa7\u8fd8\u662f\u53f3\u4fa7<\/li>\n<\/ul>\n
      \u4ee3\u7801\u601d\u8def<\/h3>\n
        \n
      1. \u8bbe\u7f6e\u5de6\u8fb9\u754c\u7b49\u4e8e 0\uff0c\u53f3\u8fb9\u754c\u7b49\u4e8e numsLen – 1<\/li>\n
      2. \u5bf9\u4e8e mid \u6240\u6307\u5411\u7684\u6570\uff0c\u82e5 nums[mid] > nums[mid + 1]\u5219\u8868\u793a mid \u6307\u5411\u7684\u6570\u5728\u6700\u5927\u503c\u53f3\u4fa7\u6216\u6700\u5927\u503c\uff0c\u90a3\u4e48 right = mid\uff0c\u5426\u5219 left = mid<\/li>\n
      3. \u4e0d\u65ad\u91cd\u590d 2 \u76f4\u5230 left + 1 == right \u9000\u51fa<\/li>\n
      4. left \u548c right \u6307\u5411\u7684\u6570\u4e2d\u8f83\u5927\u7684\u4e00\u4e2a\u5373\u6700\u5927\u503c\uff0c\u5c06\u5176\u8fd4\u56de<\/li>\n<\/ol>\n
        \u590d\u6742\u5ea6\u5206\u6790<\/h3>\n
        N \u8868\u793a\u6570\u7ec4 nums \u957f\u5ea6<\/p>\n
          \n
        • \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(N)<\/li>\n
        • \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(logN)<\/li>\n<\/ul>\n
          public class Solution {     \/**      * @param nums: a mountain sequence which increase firstly and then decrease      * @return: then mountain top      *\/      public int mountainSequence(int[] nums) {         if (nums == null || nums.length == 0) {             return 0;         }         int left = 0;         int right = nums.length - 1;         while (left + 1 < right) {             int mid = left + (right - left) \/ 2;             if (nums[mid] > nums[mid + 1]) {                 right = mid;             } else {                 left = mid;             }         }         return Math.max(nums[left], nums[right]);     } } <\/code><\/pre>\n
          \u4e0d\u77e5\u9053\u6709\u6ca1\u6709\u4eba\u7ec4\u4e2a\u5237\u9898\u7fa4\uff0c\u4e92\u76f8\u76d1\u7763\u5237\u9898\u7684<\/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":"
            \u6211\u80e1\u6c49\u4e09\u53c8\u56de\u6765\u5237\u9898\u4e86\uff01 [Leet…<\/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\/166863"}],"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=166863"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/166863\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=166863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=166863"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=166863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}