{"id":812,"date":"2020-12-08T17:53:19","date_gmt":"2020-12-08T09:53:19","guid":{"rendered":"http:\/\/39.96.58.60\/?p=812"},"modified":"2022-10-18T16:37:12","modified_gmt":"2022-10-18T08:37:12","slug":"leetcode-452-%e7%94%a8%e6%9c%80%e5%b0%91%e6%95%b0%e9%87%8f%e7%9a%84%e7%ae%ad%e5%bc%95%e7%88%86%e6%b0%94%e7%90%83","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=812","title":{"rendered":"Leetcode 452. \u7528\u6700\u5c11\u6570\u91cf\u7684\u7bad\u5f15\u7206\u6c14\u7403"},"content":{"rendered":"<p>\u5728\u4e8c\u7ef4\u7a7a\u95f4\u4e2d\u6709\u8bb8\u591a\u7403\u5f62\u7684\u6c14\u7403\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u6c14\u7403\uff0c\u63d0\u4f9b\u7684\u8f93\u5165\u662f\u6c34\u5e73\u65b9\u5411\u4e0a\uff0c\u6c14\u7403\u76f4\u5f84\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u5750\u6807\u3002\u7531\u4e8e\u5b83\u662f\u6c34\u5e73\u7684\uff0c\u6240\u4ee5\u7eb5\u5750\u6807\u5e76\u4e0d\u91cd\u8981\uff0c\u56e0\u6b64\u53ea\u8981\u77e5\u9053\u5f00\u59cb\u548c\u7ed3\u675f\u7684\u6a2a\u5750\u6807\u5c31\u8db3\u591f\u4e86\u3002\u5f00\u59cb\u5750\u6807\u603b\u662f\u5c0f\u4e8e\u7ed3\u675f\u5750\u6807\u3002<\/p>\n<p>\u4e00\u652f\u5f13\u7bad\u53ef\u4ee5\u6cbf\u7740 x \u8f74\u4ece\u4e0d\u540c\u70b9\u5b8c\u5168\u5782\u76f4\u5730\u5c04\u51fa\u3002\u5728\u5750\u6807 x \u5904\u5c04\u51fa\u4e00\u652f\u7bad\uff0c\u82e5\u6709\u4e00\u4e2a\u6c14\u7403\u7684\u76f4\u5f84\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u5750\u6807\u4e3a <code>x<\/code><sub><code>start<\/code>\uff0c<\/sub><code>x<\/code><sub><code>end<\/code>\uff0c<\/sub> \u4e14\u6ee1\u8db3 &nbsp;<code>x<sub>start<\/sub>&nbsp;\u2264 x \u2264 x<\/code><sub><code>end<\/code>\uff0c<\/sub>\u5219\u8be5\u6c14\u7403\u4f1a\u88ab\u5f15\u7206<sub>\u3002<\/sub>\u53ef\u4ee5\u5c04\u51fa\u7684\u5f13\u7bad\u7684\u6570\u91cf\u6ca1\u6709\u9650\u5236\u3002 \u5f13\u7bad\u4e00\u65e6\u88ab\u5c04\u51fa\u4e4b\u540e\uff0c\u53ef\u4ee5\u65e0\u9650\u5730\u524d\u8fdb\u3002\u6211\u4eec\u60f3\u627e\u5230\u4f7f\u5f97\u6240\u6709\u6c14\u7403\u5168\u90e8\u88ab\u5f15\u7206\uff0c\u6240\u9700\u7684\u5f13\u7bad\u7684\u6700\u5c0f\u6570\u91cf\u3002<\/p>\n<p>\u7ed9\u4f60\u4e00\u4e2a\u6570\u7ec4 <code>points<\/code> \uff0c\u5176\u4e2d <code>points [i] = [x<sub>start<\/sub>,x<sub>end<\/sub>]<\/code> \uff0c\u8fd4\u56de\u5f15\u7206\u6240\u6709\u6c14\u7403\u6240\u5fc5\u987b\u5c04\u51fa\u7684\u6700\u5c0f\u5f13\u7bad\u6570\u3002<\/p>\n<p><strong>\u793a\u4f8b 1\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>points = [[10,16],[2,8],[1,6],[7,12]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>2\n\n<strong>\u89e3\u91ca\uff1a<\/strong>\u5bf9\u4e8e\u8be5\u6837\u4f8b\uff0cx = 6 \u53ef\u4ee5\u5c04\u7206 [2,8],[1,6] \u4e24\u4e2a\u6c14\u7403\uff0c\u4ee5\u53ca x = 11 \u5c04\u7206\u53e6\u5916\u4e24\u4e2a\u6c14\u7403<\/pre>\n<p><strong>\u793a\u4f8b 2\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>points = [[1,2],[3,4],[5,6],[7,8]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>4\n\n<\/pre>\n<p><strong>\u793a\u4f8b 3\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>points = [[1,2],[2,3],[3,4],[4,5]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>2\n\n<\/pre>\n<p><strong>\u793a\u4f8b 4\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>points = [[1,2]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>1\n\n<\/pre>\n<p><strong>\u793a\u4f8b 5\uff1a<\/strong><\/p>\n<pre><strong>\u8f93\u5165\uff1a<\/strong>points = [[2,3],[2,3]]\n\n<strong>\u8f93\u51fa\uff1a<\/strong>1\n\n<\/pre>\n<p><strong>\u63d0\u793a\uff1a<\/strong><\/p>\n<ul>\n<li><code>0 &lt;= points.length &lt;= 10<sup>4<\/sup><\/code><\/li>\n<li><code>points[i].length == 2<\/code><\/li>\n<li><code>-2<sup>31<\/sup> &lt;= x<sub>start<\/sub> &lt;&nbsp;x<sub>end<\/sub> &lt;= 2<sup>31<\/sup> - 1<\/code><\/li>\n<\/ul>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u8d2a\u5fc3\u7b97\u6cd5\u3001 \u6392\u5e8f\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\uff1a128 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8629.39% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a16.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8652.88% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def findMinArrowShots(self, points: List[List[int]]) -&gt; int:\n        if len(points) == 0:\n            return 0\n        points.sort()\n        result = 1\n        now = points[0]\n        i = 0\n\n        while i &lt; len(points):\n            # print(points, now, points[i])\n            if now[1] &gt;= points[i][0]:  # \u6709\u4ea4\u53c9\n                now = [max(now[0], points[i][0]), min(now[1], points[i][1])]    # \u66f4\u65b0\u7bad\u7684\u8303\u56f4\n                i += 1\n            else:\n                now = points[i]\n                i += 1\n                result += 1\n        return result\n\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u4e8c\u7ef4\u7a7a\u95f4\u4e2d\u6709\u8bb8\u591a\u7403\u5f62\u7684\u6c14\u7403\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u6c14\u7403\uff0c\u63d0\u4f9b\u7684\u8f93\u5165\u662f\u6c34\u5e73\u65b9\u5411\u4e0a\uff0c\u6c14\u7403\u76f4\u5f84\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u5750\u6807\u3002\u7531\u4e8e\u5b83\u662f\u6c34\u5e73\u7684\uff0c&#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":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/812"}],"collection":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=812"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/812\/revisions"}],"predecessor-version":[{"id":813,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/812\/revisions\/813"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=812"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=812"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=812"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}