{"id":2565,"date":"2022-02-03T19:26:50","date_gmt":"2022-02-03T11:26:50","guid":{"rendered":"http:\/\/139.9.1.231\/?p=2565"},"modified":"2022-02-03T19:26:52","modified_gmt":"2022-02-03T11:26:52","slug":"leetcodeday110","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/02\/03\/leetcodeday110\/","title":{"rendered":"leetcodeday110–\u5e73\u8861\u4e8c\u53c9\u6811"},"content":{"rendered":"\n

\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u5224\u65ad\u5b83\u662f\u5426\u662f\u9ad8\u5ea6\u5e73\u8861\u7684\u4e8c\u53c9\u6811\u3002<\/p>\n\n\n\n

\u672c\u9898\u4e2d\uff0c\u4e00\u68f5\u9ad8\u5ea6\u5e73\u8861\u4e8c\u53c9\u6811\u5b9a\u4e49\u4e3a\uff1a<\/p>\n\n\n\n

\u4e00\u4e2a\u4e8c\u53c9\u6811\u6bcf\u4e2a\u8282\u70b9 <\/em>\u7684\u5de6\u53f3\u4e24\u4e2a\u5b50\u6811\u7684\u9ad8\u5ea6\u5dee\u7684\u7edd\u5bf9\u503c\u4e0d\u8d85\u8fc7 1 \u3002<\/p><\/blockquote>\n\n\n\n

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

\"\"\/<\/figure>\n\n\n\n
\u8f93\u5165\uff1a<\/strong>root = [3,9,20,null,null,15,7]\n\u8f93\u51fa\uff1a<\/strong>true<\/code><\/pre>\n\n\n\n
# [110] \u5e73\u8861\u4e8c\u53c9\u6811\r\n#\r\n\r\n# @lc code=start\r\n# Definition for a binary tree node.\r\n# class TreeNode:\r\n#     def __init__(self, val=0, left=None, right=None):\r\n#         self.val = val\r\n#         self.left = left\r\n#         self.right = right\r\nclass Solution:\r\n    def isBalanced(self, root: TreeNode) -> bool:\r\n        def recur(root):\r\n            # \u6811\u4e3a\u7a7a\uff0c\u4e5f\u662f\u5e73\u8861\u4e8c\u53c9\u6811\r\n            if not root:\r\n                return 0\r\n            # \u67e5\u770b\u5de6\u5b50\u6811\r\n            left = recur(root.left)\r\n            # \u5de6\u5b50\u6811\u975e\u5e73\u8861\uff0c\u76f4\u63a5\u8fd4\u56de\u975e\u5e73\u8861\u7684\u7ed3\u8bba\r\n            if left == -1:\r\n                return -1\r\n            # \u67e5\u770b\u53f3\u5b50\u6811\r\n            right = recur(root.right)\r\n            # \u53f3\u5b50\u6811\u975e\u5e73\u8861\uff0c\u76f4\u63a5\u8fd4\u56de\u975e\u5e73\u8861\u7684\u7ed3\u8bba\r\n            if right == -1:\r\n                return -1\r\n            # \u5982\u679c\u5de6\u53f3\u5b50\u6811\u5747\u662f\u5e73\u8861\u7684\uff0c\u90a3\u4e48\u8fd4\u56de\u5b83\u4eec\u6df1\u5ea6\u7684\u6700\u5927\u503c\u5e76\u52a01\r\n            # \u8868\u793a\u5bf9\u5e94\u7ed3\u70b9\u7684\u6df1\u5ea6\r\n            # \u5982\u679c\u5de6\u53f3\u5b50\u6811\u7684\u6df1\u5ea6\u76f8\u5dee\u5927\u4e8e1\uff0c \u90a3\u4e48\u5f53\u524d\u7ed3\u70b9\u662f\u975e\u5e73\u8861\u7684\r\n            # \u603b\u4f53\u6765\u770b\uff0c\u6574\u68f5\u6811\u4e5f\u662f\u975e\u5e73\u8861\u7684\r\n            return max(left, right) + 1 if abs(left-right) <= 1 else -1\r\n        return recur(root) != -1\r\n# @lc code=end        def recur(root):\r\n            # \u6811\u4e3a\u7a7a\uff0c\u4e5f\u662f\u5e73\u8861\u4e8c\u53c9\u6811\r\n            if not root:\r\n                return 0\r\n            # \u67e5\u770b\u5de6\u5b50\u6811\r\n            left = recur(root.left)\r\n            # \u5de6\u5b50\u6811\u975e\u5e73\u8861\uff0c\u76f4\u63a5\u8fd4\u56de\u975e\u5e73\u8861\u7684\u7ed3\u8bba\r\n            if left == -1:\r\n                return -1\r\n            # \u67e5\u770b\u53f3\u5b50\u6811\r\n            right = recur(root.right)\r\n            # \u53f3\u5b50\u6811\u975e\u5e73\u8861\uff0c\u76f4\u63a5\u8fd4\u56de\u975e\u5e73\u8861\u7684\u7ed3\u8bba\r\n            if right == -1:\r\n                return -1\r\n            # \u5982\u679c\u5de6\u53f3\u5b50\u6811\u5747\u662f\u5e73\u8861\u7684\uff0c\u90a3\u4e48\u8fd4\u56de\u5b83\u4eec\u6df1\u5ea6\u7684\u6700\u5927\u503c\u5e76\u52a01\r\n            # \u8868\u793a\u5bf9\u5e94\u7ed3\u70b9\u7684\u6df1\u5ea6\r\n            # \u5982\u679c\u5de6\u53f3\u5b50\u6811\u7684\u6df1\u5ea6\u76f8\u5dee\u5927\u4e8e1\uff0c \u90a3\u4e48\u5f53\u524d\u7ed3\u70b9\u662f\u975e\u5e73\u8861\u7684\r\n            # \u603b\u4f53\u6765\u770b\uff0c\u6574\u68f5\u6811\u4e5f\u662f\u975e\u5e73\u8861\u7684\r\n            return max(left, right) + 1 if abs(left-right) <= 1 else -1\r\n        return recur(root) != -1<\/code><\/pre>\n\n\n\n
\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"
\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\uff0c\u5224\u65ad\u5b83\u662f\u5426\u662f\u9ad8\u5ea6\u5e73\u8861\u7684\u4e8c\u53c9\u6811\u3002 \u672c\u9898\u4e2d\uff0c\u4e00\u68f5\u9ad8\u5ea6\u5e73\u8861\u4e8c\u53c9\u6811\u5b9a\u4e49\u4e3a\uff1a \u4e00\u4e2a\u4e8c\u53c9\u6811\u6bcf\u4e2a\u8282\u70b9&nbs … \u7ee7\u7eed\u9605\u8bfbleetcodeday110–\u5e73\u8861\u4e8c\u53c9\u6811<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2565"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=2565"}],"version-history":[{"count":1,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2565\/revisions"}],"predecessor-version":[{"id":2567,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/2565\/revisions\/2567"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=2565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=2565"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=2565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}