{"id":391,"date":"2020-09-26T10:36:11","date_gmt":"2020-09-26T02:36:11","guid":{"rendered":"http:\/\/39.96.58.60\/?p=391"},"modified":"2022-10-18T16:39:35","modified_gmt":"2022-10-18T08:39:35","slug":"leetcode-993-%e4%ba%8c%e5%8f%89%e6%a0%91%e7%9a%84%e5%a0%82%e5%85%84%e5%bc%9f%e8%8a%82%e7%82%b9","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=391","title":{"rendered":"Leetcode 993. \u4e8c\u53c9\u6811\u7684\u5802\u5144\u5f1f\u8282\u70b9"},"content":{"rendered":"

\u5728\u4e8c\u53c9\u6811\u4e2d\uff0c\u6839\u8282\u70b9\u4f4d\u4e8e\u6df1\u5ea6 0<\/code> \u5904\uff0c\u6bcf\u4e2a\u6df1\u5ea6\u4e3a k<\/code> \u7684\u8282\u70b9\u7684\u5b50\u8282\u70b9\u4f4d\u4e8e\u6df1\u5ea6 k+1<\/code> \u5904\u3002<\/p>\n

\u5982\u679c\u4e8c\u53c9\u6811\u7684\u4e24\u4e2a\u8282\u70b9\u6df1\u5ea6\u76f8\u540c\uff0c\u4f46\u7236\u8282\u70b9\u4e0d\u540c<\/strong>\uff0c\u5219\u5b83\u4eec\u662f\u4e00\u5bf9\u5802\u5144\u5f1f\u8282\u70b9<\/em>\u3002<\/p>\n

\u6211\u4eec\u7ed9\u51fa\u4e86\u5177\u6709\u552f\u4e00\u503c\u7684\u4e8c\u53c9\u6811\u7684\u6839\u8282\u70b9 root<\/code>\uff0c\u4ee5\u53ca\u6811\u4e2d\u4e24\u4e2a\u4e0d\u540c\u8282\u70b9\u7684\u503c x<\/code> \u548c y<\/code>\u3002<\/p>\n

\u53ea\u6709\u4e0e\u503c x<\/code> \u548c y<\/code> \u5bf9\u5e94\u7684\u8282\u70b9\u662f\u5802\u5144\u5f1f\u8282\u70b9\u65f6\uff0c\u624d\u8fd4\u56de true<\/code>\u3002\u5426\u5219\uff0c\u8fd4\u56de false<\/code>\u3002<\/p>\n

 <\/p>\n

\u793a\u4f8b 1\uff1a<\/strong><\/p>\n


\n<\/strong>\"\"<\/strong><\/p>\n

\u8f93\u5165\uff1a<\/strong>root = [1,2,3,4], x = 4, y = 3\n\n\u8f93\u51fa\uff1a<\/strong>false\n\n<\/pre>\n
\u793a\u4f8b 2\uff1a<\/strong><\/p>\n

\n<\/strong>\"\"<\/strong><\/p>\n
\u8f93\u5165\uff1a<\/strong>root = [1,2,3,null,4,null,5], x = 5, y = 4\n\n\u8f93\u51fa\uff1a<\/strong>true\n\n<\/pre>\n
\u793a\u4f8b 3\uff1a<\/strong><\/p>\n
\"\"<\/strong><\/p>\n
\u8f93\u5165\uff1a<\/strong>root = [1,2,3,null,4], x = 2, y = 3\n\n\u8f93\u51fa\uff1a<\/strong>false<\/pre>\n
 <\/p>\n
\u63d0\u793a\uff1a<\/strong><\/p>\n
    \n
  1. \u4e8c\u53c9\u6811\u7684\u8282\u70b9\u6570\u4ecb\u4e8e 2<\/code> \u5230 100<\/code> \u4e4b\u95f4\u3002<\/li>\n
  2. \u6bcf\u4e2a\u8282\u70b9\u7684\u503c\u90fd\u662f\u552f\u4e00\u7684\u3001\u8303\u56f4\u4e3a 1<\/code> \u5230 100<\/code> \u7684\u6574\u6570\u3002<\/li>\n<\/ol>\n
     <\/p>\n
    **\u96be\u5ea6**: Easy<\/p>\n
    **\u6807\u7b7e**: \u6811\u3001 \u5e7f\u5ea6\u4f18\u5148\u641c\u7d22\u3001<\/p>\n
    \n
    \n# -*- coding: utf-8 -*-\n# @Author  : LG\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a36 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8695.78% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a13.5 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8617.49% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u5148\u5bfb\u627e\u4e24\u8282\u70b9\u5728\u6811\u4e2d\u7684\u4f4d\u7f6e\n    \u4fdd\u5b58\uff0c\u8282\u70b9\u7684\u6df1\u5ea6\u548c\u7236\u8282\u70b9\n    \u5177\u4f53\u5b9e\u73b0\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def isCousins(self, root: TreeNode, x: int, y: int) -> bool:\n        record = {} # \u7528\u4e8e\u4fdd\u5b58  x,y\u5728\u6811\u4e2d\u7684\u6df1\u5ea6\u548c\u7236\u8282\u70b9\n        def find(root, f, h):\n            if root:\n                if root.val == x or root.val == y:  # \u627e\u5230x,y\n                    record[root.val] = [f, h]       # \u8bb0\u5f55x,y\u7684\u7236\u8282\u70b9\u548c\u6df1\u5ea6\n                    return\n                find(root.left, root, h+1)\n                find(root.right, root, h+1)\n\n        find(root, None, 0)\n\n        if len(record) == 2:    # \u5982\u679cx,y\u90fd\u627e\u5230\n            if record[x][1] == record[y][1] and record[x][0] != record[y][0]:   # xy\u5904\u4e8e\u540c\u6df1\u5ea6\uff0c\u4e14\u7236\u8282\u70b9\u4e0d\u540c\u65f6\uff0c\u8fd4\u56detrue\n                return True\n            else:\n                return False\n        else:\n            return False<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    \u5728\u4e8c\u53c9\u6811\u4e2d\uff0c\u6839\u8282\u70b9\u4f4d\u4e8e\u6df1\u5ea6 0 \u5904\uff0c\u6bcf\u4e2a\u6df1\u5ea6\u4e3a k \u7684\u8282\u70b9\u7684\u5b50\u8282\u70b9\u4f4d\u4e8e\u6df1\u5ea6 k+1 \u5904\u3002 \u5982\u679c\u4e8c\u53c9\u6811\u7684\u4e24\u4e2a\u8282\u70b9…<\/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\/391"}],"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=391"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/391\/revisions"}],"predecessor-version":[{"id":392,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/391\/revisions\/392"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=391"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=391"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=391"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}