{"id":1871,"date":"2016-03-11T15:10:00","date_gmt":"2016-03-11T07:10:00","guid":{"rendered":"http:\/\/boweihe.me\/?p=1871"},"modified":"2016-03-11T15:10:00","modified_gmt":"2016-03-11T07:10:00","slug":"leetcode-33-search-in-rotated-sorted-array","status":"publish","type":"post","link":"https:\/\/dayandcarrot.space\/?p=1871","title":{"rendered":"LeetCode 33. Search in Rotated Sorted Array"},"content":{"rendered":"<p><strong>\u9898\u76ee\uff1a<\/strong>https:\/\/leetcode.com\/problems\/search-in-rotated-sorted-array\/<br \/>\n<strong>\u601d\u8def\uff1a<\/strong><br \/>\n\u6709\u5e8f\u6570\u5217\u91cc\u5934\u627e\u5143\u7d20\uff0c\u7b2c\u4e00\u60f3\u5230\u7684\u80af\u5b9a\u662f\u4e8c\u5206\u6cd5\uff0c\u4f46\u662f\u73b0\u5728\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u88ab\u65cb\u8f6c\u8fc7\u4e86\uff0c\u8fd9\u600e\u4e48\u6539\u8fdb\u5462\uff1f\u5047\u5b9a\u8f93\u5165\u662f[4 5 6 7 0 1 2]\uff0c\u5982\u679c\u4ecd\u7528\u4e8c\u5206\u6cd5\uff0c\u90a3\u4e48\u7b2c\u4e00\u6b21\u641c\u7d22\u65f6\uff0c\u5de6\u4e2d\u53f3\u7684\u5143\u7d20\u5206\u522b\u662fa[left] = 4; a[mid]=7; a[right]=2<br \/>\n\u4ece\u9898\u8bbe\u53ef\u4ee5\u77e5\u9053\uff0c\u95ee\u9898\u7684\u5173\u952e\u662f\uff0c\u88ab\u62c6\u5206\u7684\u4e24\u4e2a\u90e8\u5206\u91cc\uff0c\u80af\u5b9a\u662f\u4e00\u534a\u6709\u5e8f\u4e00\u534a\u65e0\u5e8f\u7684(\u56e0\u4e3a\u65cb\u8f6c\u70b9\uff0c\u5373a[i+1] &gt; a[i]\u7684i\u70b9)\u80af\u5b9a\u53ea\u80fd\u5728\u4e24\u90e8\u5206\u7684\u5176\u4e00\u91cc\u5934\uff0c\u800c\u5bf9\u4e8e\u6709\u5e8f\u7684\u90a3\u4e00\u534a\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u9996\u672b\u5143\u7d20\u5224\u65adtarget\u662f\u5426\u5728\u5176\u4e2d\uff0c\u4e8e\u662f\u6709\u4e86\u4e0b\u9762\u7684\u89c4\u5219\uff1a<\/p>\n<ul>\n<li>\u89c2\u5bdf\u88ab\u4e8c\u5206\u51fa\u6765\u7684\u5de6\u534a\u6bb5\uff08\u5f53\u7136\u53f3\u534a\u6bb5\u4e5f\u53ef\u4ee5\uff09\uff0c\u6839\u636ea[left],a[mid]\u7684\u503c\u5224\u65ad\u8fd9\u534a\u6bb5\u662f\u5426\u6709\u5e8f\n<ul>\n<li>\u5982\u679c\u6709\u5e8f\uff0c\u6839\u636e\u5934\u5c3e\u5143\u7d20\u5224\u65adtarget\u662f\u5426\u5728\u91cc\u5934\uff0c\u5982\u679c\u5728\uff0c\u90a3\u5c31\u641c\u7d22\u5de6\u534a\u7aef\uff0c\u5426\u5219\u53ea\u80fd\u5728\u65e0\u5e8f\u7684\u53f3\u534a\u6bb5\u91cc\u627e\u4e86<\/li>\n<li>\u5982\u679c\u65e0\u5e8f\uff0c\u90a3\u53f3\u534a\u6bb5\u80af\u5b9a\u662f\u6709\u5e8f\u7684\uff0c\u53bb\u5224\u65adtarget\u662f\u5426\u5728\u53f3\u534a\u6bb5\u91cc\u5934\uff1a\u5982\u679c\u5728\uff0c\u5219\u641c\u7d22\u53f3\u534a\u6bb5\uff0c\u5426\u5219\u8fd8\u662f\u8001\u8001\u5b9e\u5b9e\u628a\u5de6\u534a\u7aef\u518d\u4e8c\u5206\u4e86\u627e\u5427..<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u60f3\u6bd4\u666e\u901a\u7684\u4e8c\u5206\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u591a\u4e86\u51e0\u4e2a\u5224\u65ad\u7684\u6b65\u9aa4\uff0c\u4f46\u6574\u4f53\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u8fd8\u662fO(logN)<br \/>\n<strong>\u4ee3\u7801\uff1a<\/strong><\/p>\n<pre class=\"lang:c++ decode:true \">class Solution {\npublic:\n    int search(vector&lt;int&gt;&amp; nums, int target) {\n        int left = 0;\n        int right = nums.size() - 1;\n        int mid;\n        while(left &lt;= right){\n            mid = (left + right) \/ 2;\n            if(target == nums[mid])\n                return mid;\n            if(nums[left] &lt;= nums[mid]){\n                \/\/The left part is in order, check if target is inside\n                if(nums[left] &lt;= target &amp;&amp; nums[mid] &gt;= target){\n                    \/\/Yep, move to the left part\n                    right = mid - 1;\n                } else {\n                    \/\/Nope, move to the right part\n                    left = mid + 1;\n                }\n            } else {\n                \/\/The left part is not in order, but the right one should be, check if target is in the right wing\n                if(nums[mid] &lt;= target &amp;&amp; nums[right] &gt;= target){\n                    \/\/Yep, move to the right wing\n                    left = mid + 1;\n                } else {\n                    \/\/Nope, try in the left wing\n                    right = mid - 1;\n                }\n            }\n        }\n        return -1;\n    }\n};<\/pre>\n<p>&nbsp;<br \/>\n&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\uff1ahttps:\/\/leetcode.com\/problems\/search-in-rotated-sorted-array\/ \u601d\u8def\uff1a \u6709\u5e8f\u6570\u5217\u91cc\u5934\u627e\u5143\u7d20\uff0c\u7b2c\u4e00\u60f3\u5230\u7684\u80af\u5b9a\u662f\u4e8c\u5206\u6cd5\uff0c\u4f46\u662f\u73b0\u5728\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u88ab\u65cb\u8f6c\u8fc7\u4e86\uff0c\u8fd9\u600e\u4e48\u6539\u8fdb\u5462\uff1f\u5047\u5b9a\u8f93\u5165\u662f[4 5 6 7 0 1 2]\uff0c\u5982\u679c\u4ecd\u7528\u4e8c\u5206\u6cd5\uff0c\u90a3\u4e48\u7b2c\u4e00\u6b21\u641c\u7d22\u65f6\uff0c\u5de6\u4e2d\u53f3\u7684\u5143\u7d20\u5206\u522b\u662fa[left] = 4; a[mid]=7; a[right]=2 \u4ece\u9898\u8bbe\u53ef\u4ee5\u77e5\u9053\uff0c\u95ee\u9898\u7684\u5173\u952e\u662f\uff0c\u88ab\u62c6\u5206\u7684\u4e24\u4e2a\u90e8\u5206\u91cc\uff0c\u80af\u5b9a\u662f\u4e00\u534a\u6709\u5e8f\u4e00\u534a\u65e0\u5e8f\u7684(\u56e0\u4e3a\u65cb\u8f6c\u70b9\uff0c\u5373a[i+1] &gt; a[i]\u7684i\u70b9)\u80af\u5b9a\u53ea\u80fd\u5728\u4e24\u90e8\u5206\u7684\u5176\u4e00\u91cc\u5934\uff0c\u800c\u5bf9\u4e8e\u6709\u5e8f\u7684\u90a3\u4e00\u534a\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u9996\u672b\u5143\u7d20\u5224\u65adtarget\u662f\u5426\u5728\u5176\u4e2d\uff0c\u4e8e\u662f\u6709\u4e86\u4e0b\u9762\u7684\u89c4\u5219\uff1a \u89c2\u5bdf\u88ab\u4e8c\u5206\u51fa\u6765\u7684\u5de6\u534a\u6bb5\uff08\u5f53\u7136\u53f3\u534a\u6bb5\u4e5f\u53ef\u4ee5\uff09\uff0c\u6839\u636ea[left],a[mid]\u7684\u503c\u5224\u65ad\u8fd9\u534a\u6bb5\u662f\u5426\u6709\u5e8f \u5982\u679c\u6709\u5e8f\uff0c\u6839\u636e\u5934\u5c3e\u5143\u7d20\u5224\u65adtarget\u662f\u5426\u5728\u91cc\u5934\uff0c\u5982\u679c\u5728\uff0c\u90a3\u5c31\u641c\u7d22\u5de6\u534a\u7aef\uff0c\u5426\u5219\u53ea\u80fd\u5728\u65e0\u5e8f\u7684\u53f3\u534a\u6bb5\u91cc\u627e\u4e86 \u5982\u679c\u65e0\u5e8f\uff0c\u90a3\u53f3\u534a\u6bb5\u80af\u5b9a\u662f\u6709\u5e8f\u7684\uff0c\u53bb\u5224\u65adtarget\u662f\u5426\u5728\u53f3\u534a\u6bb5\u91cc\u5934\uff1a\u5982\u679c\u5728\uff0c\u5219\u641c\u7d22\u53f3\u534a\u6bb5\uff0c\u5426\u5219\u8fd8\u662f\u8001\u8001\u5b9e\u5b9e\u628a\u5de6\u534a\u7aef\u518d\u4e8c\u5206\u4e86\u627e\u5427.. \u60f3\u6bd4\u666e\u901a\u7684\u4e8c\u5206\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u591a\u4e86\u51e0\u4e2a\u5224\u65ad\u7684\u6b65\u9aa4\uff0c\u4f46\u6574\u4f53\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u8fd8\u662fO(logN) \u4ee3\u7801\uff1a class Solution { public: int search(vector&lt;int&gt;&amp; nums, int target) { int left = 0; int right = nums.size() &#8211; 1; int mid; while(left &lt;= right){ mid = (left + right) \/ 2; if(target == [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[66],"class_list":["post-1871","post","type-post","status-publish","format-standard","hentry","category-study","tag-leetcode-oj"],"_links":{"self":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts\/1871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1871"}],"version-history":[{"count":0,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=\/wp\/v2\/posts\/1871\/revisions"}],"wp:attachment":[{"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1871"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dayandcarrot.space\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}