{"id":727,"date":"2020-09-26T11:15:12","date_gmt":"2020-09-26T03:15:12","guid":{"rendered":"http:\/\/39.96.58.60\/?p=727"},"modified":"2022-10-18T16:37:28","modified_gmt":"2022-10-18T08:37:28","slug":"leetcode-63-%e4%b8%8d%e5%90%8c%e8%b7%af%e5%be%84-ii","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=727","title":{"rendered":"Leetcode 63. \u4e0d\u540c\u8def\u5f84 II"},"content":{"rendered":"<p>\u4e00\u4e2a\u673a\u5668\u4eba\u4f4d\u4e8e\u4e00\u4e2a <em>m x n <\/em>\u7f51\u683c\u7684\u5de6\u4e0a\u89d2 \uff08\u8d77\u59cb\u70b9\u5728\u4e0b\u56fe\u4e2d\u6807\u8bb0\u4e3a\u201cStart\u201d \uff09\u3002<\/p>\n<p>\u673a\u5668\u4eba\u6bcf\u6b21\u53ea\u80fd\u5411\u4e0b\u6216\u8005\u5411\u53f3\u79fb\u52a8\u4e00\u6b65\u3002\u673a\u5668\u4eba\u8bd5\u56fe\u8fbe\u5230\u7f51\u683c\u7684\u53f3\u4e0b\u89d2\uff08\u5728\u4e0b\u56fe\u4e2d\u6807\u8bb0\u4e3a\u201cFinish\u201d\uff09\u3002<\/p>\n<p>\u73b0\u5728\u8003\u8651\u7f51\u683c\u4e2d\u6709\u969c\u788d\u7269\u3002\u90a3\u4e48\u4ece\u5de6\u4e0a\u89d2\u5230\u53f3\u4e0b\u89d2\u5c06\u4f1a\u6709\u591a\u5c11\u6761\u4e0d\u540c\u7684\u8def\u5f84\uff1f<\/p>\n<p><img src=\"https:\/\/assets.leetcode-cn.com\/aliyun-lc-upload\/uploads\/2018\/10\/22\/robot_maze.png\" style=\"height: 183px; width: 400px;\"><\/p>\n<p>\u7f51\u683c\u4e2d\u7684\u969c\u788d\u7269\u548c\u7a7a\u4f4d\u7f6e\u5206\u522b\u7528 <code>1<\/code> \u548c <code>0<\/code> \u6765\u8868\u793a\u3002<\/p>\n<p><strong>\u8bf4\u660e\uff1a<\/strong><em>m<\/em>&nbsp;\u548c <em>n <\/em>\u7684\u503c\u5747\u4e0d\u8d85\u8fc7 100\u3002<\/p>\n<p><strong>\u793a\u4f8b&nbsp;1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:\n\n<\/strong>[\n\n&nbsp; [0,0,0],\n\n&nbsp; [0,1,0],\n\n&nbsp; [0,0,0]\n\n]\n\n<strong>\u8f93\u51fa:<\/strong> 2\n\n<strong>\u89e3\u91ca:<\/strong>\n\n3x3 \u7f51\u683c\u7684\u6b63\u4e2d\u95f4\u6709\u4e00\u4e2a\u969c\u788d\u7269\u3002\n\n\u4ece\u5de6\u4e0a\u89d2\u5230\u53f3\u4e0b\u89d2\u4e00\u5171\u6709 <code>2<\/code> \u6761\u4e0d\u540c\u7684\u8def\u5f84\uff1a\n\n1. \u5411\u53f3 -&gt; \u5411\u53f3 -&gt; \u5411\u4e0b -&gt; \u5411\u4e0b\n\n2. \u5411\u4e0b -&gt; \u5411\u4e0b -&gt; \u5411\u53f3 -&gt; \u5411\u53f3\n\n<\/pre>\n<p>**\u96be\u5ea6**: Medium<\/p>\n<p>**\u6807\u7b7e**: \u6570\u7ec4\u3001 \u52a8\u6001\u89c4\u5212\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\u4e8680.17% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8675.98% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u52a8\u6001\u89c4\u5212\n    \u7531\u4e8e\u7f51\u683c\u4e2d\u52a0\u5165\u4e86\u969c\u788d\n    \u969c\u788d\u53f3\u4fa7\u7684\u7f51\u683c\u8def\u5f84\u6570\uff0c\u53ea\u4f9d\u8d56\u4e8e\u7f51\u683c\u4e0a\u4fa7\n    \u969c\u788d\u4e0b\u4fa7\u7684\u7f51\u683c\u8def\u5f84\u6570\uff0c\u53ea\u4f9d\u8d56\u4e8e\u7f51\u683c\u5de6\u4fa7\n    \u4e3a\u7edf\u4e00\u601d\u8def\uff0c\u5c06\u5b58\u5728\u969c\u788d\u7684\u7f51\u683c\u8def\u5f84\u6570\u7f6e\u4e3a0 \u5373\u53ef\n\"\"\"\nclass Solution:\n    def uniquePathsWithObstacles(self, obstacleGrid: List[List[int]]) -&gt; int:\n        n, m = len(obstacleGrid), len(obstacleGrid[0])\n\n        dp = [[1 for _ in range(m)] for _ in range(n)]\n        if obstacleGrid[0][0] == 1:\n            dp[0][0] = 0\n\n        for i in range(1, n):\n            if obstacleGrid[i][0] == 1:\n                dp[i][0] = 0\n            else:\n                dp[i][0] = dp[i-1][0]\n\n        for j in range(1, m):\n            if obstacleGrid[0][j] == 1:\n                dp[0][j] = 0\n            else:\n                dp[0][j] = dp[0][j-1]\n\n        for i in range(1, n):\n            for j in range(1, m):\n                if obstacleGrid[i][j] == 1:\n                    dp[i][j] = 0\n                else:\n                    dp[i][j] = dp[i-1][j] + dp[i][j-1]\n        return dp[-1][-1]<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u4e2a\u673a\u5668\u4eba\u4f4d\u4e8e\u4e00\u4e2a m x n \u7f51\u683c\u7684\u5de6\u4e0a\u89d2 \uff08\u8d77\u59cb\u70b9\u5728\u4e0b\u56fe\u4e2d\u6807\u8bb0\u4e3a\u201cStart\u201d \uff09\u3002 \u673a\u5668\u4eba\u6bcf\u6b21\u53ea\u80fd\u5411\u4e0b\u6216&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":[],"categories":[11,1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/727"}],"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=727"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/727\/revisions"}],"predecessor-version":[{"id":728,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/727\/revisions\/728"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=727"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=727"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}