{"id":425,"date":"2020-09-26T10:40:02","date_gmt":"2020-09-26T02:40:02","guid":{"rendered":"http:\/\/39.96.58.60\/?p=425"},"modified":"2022-10-18T16:39:23","modified_gmt":"2022-10-18T08:39:23","slug":"leetcode-733-%e5%9b%be%e5%83%8f%e6%b8%b2%e6%9f%93","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=425","title":{"rendered":"Leetcode 733. \u56fe\u50cf\u6e32\u67d3"},"content":{"rendered":"<p>\u6709\u4e00\u5e45\u4ee5\u4e8c\u7ef4\u6574\u6570\u6570\u7ec4\u8868\u793a\u7684\u56fe\u753b\uff0c\u6bcf\u4e00\u4e2a\u6574\u6570\u8868\u793a\u8be5\u56fe\u753b\u7684\u50cf\u7d20\u503c\u5927\u5c0f\uff0c\u6570\u503c\u5728 0 \u5230 65535 \u4e4b\u95f4\u3002<\/p>\n<p>\u7ed9\u4f60\u4e00\u4e2a\u5750\u6807&nbsp;<code>(sr, sc)<\/code>&nbsp;\u8868\u793a\u56fe\u50cf\u6e32\u67d3\u5f00\u59cb\u7684\u50cf\u7d20\u503c\uff08\u884c \uff0c\u5217\uff09\u548c\u4e00\u4e2a\u65b0\u7684\u989c\u8272\u503c&nbsp;<code>newColor<\/code>\uff0c\u8ba9\u4f60\u91cd\u65b0\u4e0a\u8272\u8fd9\u5e45\u56fe\u50cf\u3002<\/p>\n<p>\u4e3a\u4e86\u5b8c\u6210\u4e0a\u8272\u5de5\u4f5c\uff0c\u4ece\u521d\u59cb\u5750\u6807\u5f00\u59cb\uff0c\u8bb0\u5f55\u521d\u59cb\u5750\u6807\u7684\u4e0a\u4e0b\u5de6\u53f3\u56db\u4e2a\u65b9\u5411\u4e0a\u50cf\u7d20\u503c\u4e0e\u521d\u59cb\u5750\u6807\u76f8\u540c\u7684\u76f8\u8fde\u50cf\u7d20\u70b9\uff0c\u63a5\u7740\u518d\u8bb0\u5f55\u8fd9\u56db\u4e2a\u65b9\u5411\u4e0a\u7b26\u5408\u6761\u4ef6\u7684\u50cf\u7d20\u70b9\u4e0e\u4ed6\u4eec\u5bf9\u5e94\u56db\u4e2a\u65b9\u5411\u4e0a\u50cf\u7d20\u503c\u4e0e\u521d\u59cb\u5750\u6807\u76f8\u540c\u7684\u76f8\u8fde\u50cf\u7d20\u70b9\uff0c\u2026\u2026\uff0c\u91cd\u590d\u8be5\u8fc7\u7a0b\u3002\u5c06\u6240\u6709\u6709\u8bb0\u5f55\u7684\u50cf\u7d20\u70b9\u7684\u989c\u8272\u503c\u6539\u4e3a\u65b0\u7684\u989c\u8272\u503c\u3002<\/p>\n<p>\u6700\u540e\u8fd4\u56de\u7ecf\u8fc7\u4e0a\u8272\u6e32\u67d3\u540e\u7684\u56fe\u50cf\u3002<\/p>\n<p><strong>\u793a\u4f8b 1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> \n\nimage = [[1,1,1],[1,1,0],[1,0,1]]\n\nsr = 1, sc = 1, newColor = 2\n\n<strong>\u8f93\u51fa:<\/strong> [[2,2,2],[2,2,0],[2,0,1]]\n\n<strong>\u89e3\u6790:<\/strong> \n\n\u5728\u56fe\u50cf\u7684\u6b63\u4e2d\u95f4\uff0c(\u5750\u6807(sr,sc)=(1,1)),\n\n\u5728\u8def\u5f84\u4e0a\u6240\u6709\u7b26\u5408\u6761\u4ef6\u7684\u50cf\u7d20\u70b9\u7684\u989c\u8272\u90fd\u88ab\u66f4\u6539\u62102\u3002\n\n\u6ce8\u610f\uff0c\u53f3\u4e0b\u89d2\u7684\u50cf\u7d20\u6ca1\u6709\u66f4\u6539\u4e3a2\uff0c\n\n\u56e0\u4e3a\u5b83\u4e0d\u662f\u5728\u4e0a\u4e0b\u5de6\u53f3\u56db\u4e2a\u65b9\u5411\u4e0a\u4e0e\u521d\u59cb\u70b9\u76f8\u8fde\u7684\u50cf\u7d20\u70b9\u3002\n\n<\/pre>\n<p><strong>\u6ce8\u610f:<\/strong><\/p>\n<ul>\n<li><code>image<\/code> \u548c&nbsp;<code>image[0]<\/code>&nbsp;\u7684\u957f\u5ea6\u5728\u8303\u56f4&nbsp;<code>[1, 50]<\/code> \u5185\u3002<\/li>\n<li>\u7ed9\u51fa\u7684\u521d\u59cb\u70b9\u5c06\u6ee1\u8db3&nbsp;<code>0 &lt;= sr &lt; image.length<\/code> \u548c&nbsp;<code>0 &lt;= sc &lt; image[0].length<\/code>\u3002<\/li>\n<li><code>image[i][j]<\/code> \u548c&nbsp;<code>newColor<\/code>&nbsp;\u8868\u793a\u7684\u989c\u8272\u503c\u5728\u8303\u56f4&nbsp;<code>[0, 65535]<\/code>\u5185\u3002<\/li>\n<\/ul>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6df1\u5ea6\u4f18\u5148\u641c\u7d22\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\uff1a92 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8679.49% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.6 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8692.11% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def floodFill(self, image: List[List[int]], sr: int, sc: int, newColor: int) -&gt; List[List[int]]:\n        r, c = len(image), len(image[0])\n        directions  = [[-1, 0], [1, 0], [0, -1], [0, 1]]    # \u4e0a\u4e0b\u5de6\u53f3\u7684\u56db\u4e2a\u504f\u79fb\u91cf\n        oldColor = image[sr][sc]    # \u5148\u67e5\u770b\u8d77\u59cb\u70b9\u7684\u989c\u8272\n        rc_list = [[sr, sc]]    # \u7528\u4e8e\u8bb0\u5f55\u9700\u8981\u6e32\u67d3\u7684\u70b9\u7684\u5750\u6807\n\n        if newColor == oldColor:    # \u5982\u679c\u65b0\u65e7\u989c\u8272\u76f8\u540c\uff0c\u76f4\u63a5\u8fd4\u56de\n            return image\n\n        while rc_list:      # \u5faa\u73af\u5904\u7406\u9700\u8981\u6e32\u67d3\u7684\u989c\u8272\n            sr, sc = rc_list.pop()  # \u51fa\u5217\u8868\n\n            image[sr][sc] = newColor    # \u66f4\u6539\u989c\u8272\n\n            for direction in directions:    # \u8ba1\u7b97\u4e0a\u4e0b\u5de6\u53f3\u56db\u4e2a\u70b9\n                nr, nc = sr+direction[0], sc+direction[1]\n\n                if 0 &lt;= nr &lt; r and 0 &lt;= nc &lt; c: # \u5224\u65ad\u662f\u5426\u8d8a\u754c\n                    if image[nr][nc] == oldColor:   # \u5224\u65ad\u662f\u5426\u4e3a\u9700\u8981\u6e32\u67d3\u7684\u70b9\n                        rc_list.append([nr, nc])    # \u8fdb\u5217\u8868\n\n        return image<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u6709\u4e00\u5e45\u4ee5\u4e8c\u7ef4\u6574\u6570\u6570\u7ec4\u8868\u793a\u7684\u56fe\u753b\uff0c\u6bcf\u4e00\u4e2a\u6574\u6570\u8868\u793a\u8be5\u56fe\u753b\u7684\u50cf\u7d20\u503c\u5927\u5c0f\uff0c\u6570\u503c\u5728 0 \u5230 65535 \u4e4b\u95f4\u3002 \u7ed9\u4f60\u4e00\u4e2a&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","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\/425"}],"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=425"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/425\/revisions"}],"predecessor-version":[{"id":426,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/425\/revisions\/426"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=425"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}