{"id":162064,"date":"2020-10-01T02:55:07","date_gmt":"2020-09-30T18:55:07","guid":{"rendered":"http:\/\/4563.org\/?p=162064"},"modified":"2020-10-01T02:55:07","modified_gmt":"2020-09-30T18:55:07","slug":"leetcode-lintcode-%e9%a2%98%e8%a7%a3-%e7%9b%ae%e6%a0%87%e6%9c%80%e5%90%8e%e4%bd%8d%e7%bd%ae","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=162064","title":{"rendered":"[leetcode\/lintcode \u9898\u89e3] \u76ee\u6807\u6700\u540e\u4f4d\u7f6e"},"content":{"rendered":"
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[leetcode\/lintcode \u9898\u89e3] \u76ee\u6807\u6700\u540e\u4f4d\u7f6e <\/h1>\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
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\u7ed9\u4e00\u4e2a\u5347\u5e8f\u6570\u7ec4\uff0c\u627e\u5230 target \u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u6ca1\u51fa\u73b0\u8fc7\u8fd4\u56de -1<\/p>\n

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

\u6837\u4f8b 1\uff1a<\/h2>\n
\u8f93\u5165\uff1anums = [1,2,2,4,5,5], target = 2 \u8f93\u51fa\uff1a2 <\/code><\/pre>\n
\u6837\u4f8b 2\uff1a<\/h2>\n
\u8f93\u5165\uff1anums = [1,2,2,4,5,5], target = 6 \u8f93\u51fa\uff1a-1 <\/code><\/pre>\n
\u7b97\u6cd5\uff1a\u4e8c\u5206<\/h2>\n
\u7b97\u6cd5\u601d\u8def<\/h2>\n
    \n
  • \u9898\u76ee\u8981\u6c42\u6211\u4eec\u627e\u5230 target \u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u7531\u4e8e\u6570\u7ec4\u662f\u6709\u5e8f\u6570\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u4e8c\u5206\u6cd5\u6765\u67e5\u627e<\/li>\n<\/ul>\n
    \u4ee3\u7801\u601d\u8def<\/h2>\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\u5f53 target < nums[mid]\u65f6\uff0c\u8bf4\u660e target \u5728 mid \u5de6\u4fa7\uff0c\u90a3\u4e48 right = mid \uff1b\u5426\u5219\u8bf4\u660e target \u5728 mid \u53f3\u4fa7\uff0c\u6216\u8005\u5982\u679c target == nums[mid]\u7684\u8bdd\u8bf4\u660e mid \u8fd8\u6709\u53ef\u80fd\u5b58\u5728 target \u90a3\u4e48 left = mid<\/li>\n
    3. \u4e0d\u65ad\u91cd\u590d 2 \u76f4\u5230 left + 1 == right \u9000\u51fa<\/li>\n
    4. \u5224\u65ad nums[right]\u662f\u5426\u7b49\u4e8e target\uff0c\u82e5\u7b49\u4e8e\u8fd4\u56de right\uff0c\u5426\u5219\u8fd4\u56de left\uff0c\u6ce8\u610f\u4e00\u5b9a\u8981\u5148\u5224 nums[right]\uff0c\u56e0\u4e3a nums[left]\u53ef\u80fd\u4e5f\u7b49\u4e8e target\uff0c\u4f46\u4e0d\u662f\u6700\u540e\u7684\u4f4d\u7f6e<\/li>\n<\/ol>\n
      \u590d\u6742\u5ea6\u5206\u6790<\/h2>\n
      NN \u8868\u793a nums \u6570\u7ec4\u957f\u5ea6<\/p>\n
        \n
      • \u7a7a\u95f4\u590d\u6742\u5ea6\uff1aO(1)<\/li>\n
      • \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(logN)<\/li>\n<\/ul>\n
        public class Solution {      \/**      * @param nums: An integer array sorted in ascending order      * @param target: An integer      * @return: An integer      *\/      public int lastPosition(int[] nums, int target) {         if(nums == null || nums.length == 0)             return -1;         if(target < nums[0] || target > nums[nums.length-1])             return -1;          int left = 0, right = nums.length-1;          while(left+1 < right){             int mid = left + (right - left) \/ 2;             if(nums[mid] > target)                 right = mid;             else                  left = mid;         }          if(nums[right] == target)             return right;         if(nums[left] == target)             return left;         return -1;     } }  <\/code><\/pre>\n<\/p><\/div>\n
         \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (1<\/span>)        <\/div>\n
         <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
          \n
        • \n
          \n
          \n
           \u8cc7\u6df1\u5927\u4f6c : xrr2016 <\/span>  <\/div>\n
           <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                       \u5927\u4f6c\u505a\u4e86\u591a\u5c11\u9898\u4e86\u554a                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
        • \n","protected":false},"excerpt":{"rendered":"
          [leetcode\/lintcod…<\/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\/162064"}],"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=162064"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/162064\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=162064"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=162064"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=162064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}