{"id":771,"date":"2020-12-01T16:43:29","date_gmt":"2020-12-01T08:43:29","guid":{"rendered":"http:\/\/39.96.58.60\/?p=771"},"modified":"2022-10-18T16:37:28","modified_gmt":"2022-10-18T08:37:28","slug":"leetcode-34-%e5%9c%a8%e6%8e%92%e5%ba%8f%e6%95%b0%e7%bb%84%e4%b8%ad%e6%9f%a5%e6%89%be%e5%85%83%e7%b4%a0%e7%9a%84%e7%ac%ac%e4%b8%80%e4%b8%aa%e5%92%8c%e6%9c%80%e5%90%8e%e4%b8%80%e4%b8%aa%e4%bd%8d","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=771","title":{"rendered":"Leetcode 34. \u5728\u6392\u5e8f\u6570\u7ec4\u4e2d\u67e5\u627e\u5143\u7d20\u7684\u7b2c\u4e00\u4e2a\u548c\u6700\u540e\u4e00\u4e2a\u4f4d\u7f6e"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u6309\u7167\u5347\u5e8f\u6392\u5217\u7684\u6574\u6570\u6570\u7ec4 <code>nums<\/code>\uff0c\u548c\u4e00\u4e2a\u76ee\u6807\u503c <code>target<\/code>\u3002\u627e\u51fa\u7ed9\u5b9a\u76ee\u6807\u503c\u5728\u6570\u7ec4\u4e2d\u7684\u5f00\u59cb\u4f4d\u7f6e\u548c\u7ed3\u675f\u4f4d\u7f6e\u3002<\/p>\n<p>\u5982\u679c\u6570\u7ec4\u4e2d\u4e0d\u5b58\u5728\u76ee\u6807\u503c <code>target<\/code>\uff0c\u8fd4\u56de&nbsp;<code>[-1, -1]<\/code>\u3002<\/p>\n<p><strong>\u8fdb\u9636\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f60\u53ef\u4ee5\u8bbe\u8ba1\u5e76\u5b9e\u73b0\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a&nbsp;<code>O(log n)<\/code>&nbsp;\u7684\u7b97\u6cd5\u89e3\u51b3\u6b64\u95ee\u9898\u5417\uff1f<\/li>\n<\/ul>\n<p><strong>\u793a\u4f8b 1\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>nums = [<code>5,7,7,8,8,10]<\/code>, target = 8\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[3,4]<\/pre>\n<p><strong>\u793a\u4f8b&nbsp;2\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>nums = [<code>5,7,7,8,8,10]<\/code>, target = 6\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[-1,-1]<\/pre>\n<p><strong>\u793a\u4f8b 3\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>nums = [], target = 0\n\n<strong>\u8f93\u51fa\uff1a<\/strong>[-1,-1]<\/pre>\n<p><strong>\u63d0\u793a\uff1a<\/strong><\/p>\n<ul>\n<li><code>0 &lt;= nums.length &lt;= 10<sup>5<\/sup><\/code><\/li>\n<li><code>-10<sup>9<\/sup>&nbsp;&lt;= nums[i]&nbsp;&lt;= 10<sup>9<\/sup><\/code><\/li>\n<li><code>nums<\/code>&nbsp;\u662f\u4e00\u4e2a\u975e\u9012\u51cf\u6570\u7ec4<\/li>\n<li><code>-10<sup>9<\/sup>&nbsp;&lt;= target&nbsp;&lt;= 10<sup>9<\/sup><\/code><\/li>\n<\/ul>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u6570\u7ec4\u3001 \u4e8c\u5206\u67e5\u627e\u3001<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism undefined-numbers lang-python\" data-lang=\"Python\"><code>\n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a40 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8674.31% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.4 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8612.21% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u4e8c\u5206\u67e5\u627e\uff0c\u5bfb\u627etarget\u5728nums\u4e2d\u7684\u4f4d\u7f6e\n    \u4ee5\u627e\u5230\u7684target\u503c\uff0c\u5411\u4e24\u4fa7\u6269\u5f20\n\"\"\"\nclass Solution:\n    def searchRange(self, nums: List[int], target: int) -&gt; List[int]:\n        # \u4e8c\u5206\u67e5\u627e\uff0c\u5bfb\u627etarget\n        l, r = 0, len(nums)-1\n        while l &lt; r:\n            m = (l + r) \/\/ 2\n            if nums[m] == target:\n                break\n            elif nums[m] &lt;= target:\n                l = m + 1\n            else:\n                r = m - 1\n        # \u4ece\u627e\u5230\u7684\u503c\uff0c\u5411\u4e24\u4fa7\u5bfb\u627e\n        if l &lt;= r and nums[(l + r) \/\/ 2] == target:\n            l, r = (l + r) \/\/ 2, (l + r) \/\/ 2\n            while l-1 &gt;= 0 and nums[l-1] == target:\n                l -= 1\n            while r+1 &lt;= len(nums)-1 and nums[r+1] == target:\n                r += 1\n            return [l,r]\n        else:\n            return [-1, -1]<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u6309\u7167\u5347\u5e8f\u6392\u5217\u7684\u6574\u6570\u6570\u7ec4 nums\uff0c\u548c\u4e00\u4e2a\u76ee\u6807\u503c target\u3002\u627e\u51fa\u7ed9\u5b9a\u76ee\u6807\u503c\u5728\u6570\u7ec4\u4e2d\u7684\u5f00\u59cb\u4f4d\u7f6e\u548c\u7ed3\u675f\u4f4d&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[11],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/771"}],"collection":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=771"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/771\/revisions"}],"predecessor-version":[{"id":772,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/771\/revisions\/772"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=771"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=771"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=771"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}