{"id":535,"date":"2020-09-26T10:53:09","date_gmt":"2020-09-26T02:53:09","guid":{"rendered":"http:\/\/39.96.58.60\/?p=535"},"modified":"2022-10-18T16:38:55","modified_gmt":"2022-10-18T08:38:55","slug":"leetcode-617-%e5%90%88%e5%b9%b6%e4%ba%8c%e5%8f%89%e6%a0%91","status":"publish","type":"post","link":"https:\/\/www.yatenglg.cn\/blog\/?p=535","title":{"rendered":"Leetcode 617. \u5408\u5e76\u4e8c\u53c9\u6811"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e24\u4e2a\u4e8c\u53c9\u6811\uff0c\u60f3\u8c61\u5f53\u4f60\u5c06\u5b83\u4eec\u4e2d\u7684\u4e00\u4e2a\u8986\u76d6\u5230\u53e6\u4e00\u4e2a\u4e0a\u65f6\uff0c\u4e24\u4e2a\u4e8c\u53c9\u6811\u7684\u4e00\u4e9b\u8282\u70b9\u4fbf\u4f1a\u91cd\u53e0\u3002<\/p>\n<p>\u4f60\u9700\u8981\u5c06\u4ed6\u4eec\u5408\u5e76\u4e3a\u4e00\u4e2a\u65b0\u7684\u4e8c\u53c9\u6811\u3002\u5408\u5e76\u7684\u89c4\u5219\u662f\u5982\u679c\u4e24\u4e2a\u8282\u70b9\u91cd\u53e0\uff0c\u90a3\u4e48\u5c06\u4ed6\u4eec\u7684\u503c\u76f8\u52a0\u4f5c\u4e3a\u8282\u70b9\u5408\u5e76\u540e\u7684\u65b0\u503c\uff0c\u5426\u5219<strong>\u4e0d\u4e3a&nbsp;<\/strong>NULL \u7684\u8282\u70b9\u5c06\u76f4\u63a5\u4f5c\u4e3a\u65b0\u4e8c\u53c9\u6811\u7684\u8282\u70b9\u3002<\/p>\n<p><strong>\u793a\u4f8b&nbsp;1:<\/strong><\/p>\n<pre><strong>\u8f93\u5165:<\/strong> \n\n\tTree 1                     Tree 2                  \n\n          1                         2                             \n\n         \/ \\                       \/ \\                            \n\n        3   2                     1   3                        \n\n       \/                           \\   \\                      \n\n      5                             4   7                  \n\n<strong>\u8f93\u51fa:<\/strong> \n\n\u5408\u5e76\u540e\u7684\u6811:\n\n\t     3\n\n\t    \/ \\\n\n\t   4   5\n\n\t  \/ \\   \\ \n\n\t 5   4   7\n\n<\/pre>\n<p><strong>\u6ce8\u610f:<\/strong>&nbsp;\u5408\u5e76\u5fc5\u987b\u4ece\u4e24\u4e2a\u6811\u7684\u6839\u8282\u70b9\u5f00\u59cb\u3002<\/p>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6811\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\uff1a104 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8664.10% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.4 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8679.35% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u5177\u4f53\u5b9e\u73b0\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def mergeTrees(self, t1: TreeNode, t2: TreeNode) -&gt; TreeNode:\n        def find(root1, root2): # \u4e24\u68f5\u6811\u7684\u5bf9\u5e94\u8282\u70b9\n            if root1 and root2: # \u5982\u679c\u8282\u70b9\u90fd\u5b58\u5728\n                node = TreeNode(root1.val + root2.val)  # \u5408\u5e76\u540e\u7684\u5f53\u524d\u8282\u70b9\u4e3a\u4e24\u6811\u8282\u70b9\u548c\n                node.left = find(root1.left, root2.left)    # \u5904\u7406\u4e24\u6811\u7684\u5bf9\u5e94\u5de6\u5b50\u6811\uff0c \u8fd4\u56de\u7684\u8282\u70b9\u4e3a\u5f53\u524d\u5408\u5e76\u5b50\u6811\u7684\u5de6\u5b50\u6811\n                node.right = find(root1.right, root2.right) # \u5904\u7406\u4e24\u6811\u7684\u5bf9\u5e94\u53f3\u5b50\u6811\n\n            elif root1 or root2:    # \u53ea\u5b58\u5728\u4e00\u4e2a\u8282\u70b9\n                node = TreeNode(root1.val if root1 else root2.val)  # \u5f53\u524d\u8282\u70b9\u7b49\u4e8e\u5b58\u5728\u8282\u70b9\u503c\n                node.left = find(root1.left if root1 else None, root2.left if root2 else None)  # \u904d\u5386\u5b58\u5728\u8282\u70b9\u7684\u5de6\u5b50\u6811\n                node.right = find(root1.right if root1 else None, root2.right if root2 else None)   # \u904d\u5386\u5b58\u5728\u8282\u70b9\u7684\u53f3\u5b50\u6811\n            else:\n                return None # \u5747\u4e0d\u5b58\u5728\u8fd4\u56deNone\n            return node\n        t = find(t1, t2)\n        return t\n\n\n\"\"\"\n\u6267\u884c\u7528\u65f6\uff1a100 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8691.61% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a14.5 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8646.33% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u540c\u4e0a\uff0c\u4f46\u4e0d\u65b0\u5efa\u6811\n\"\"\"\nclass Solution:\n    def mergeTrees(self, t1: TreeNode, t2: TreeNode) -&gt; TreeNode:\n        def find(root1, root2): # \u4e24\u68f5\u6811\u7684\u5bf9\u5e94\u8282\u70b9\n            if root1 and root2: # \u5982\u679c\u8282\u70b9\u90fd\u5b58\u5728\n                root1.val = root1.val + root2.val  # \u5408\u5e76\u540e\u7684\u5f53\u524d\u8282\u70b9\u4e3a\u4e24\u6811\u8282\u70b9\u548c\n                root1.left = find(root1.left, root2.left)    # \u5904\u7406\u4e24\u6811\u7684\u5bf9\u5e94\u5de6\u5b50\u6811\uff0c \u8fd4\u56de\u7684\u8282\u70b9\u4e3a\u5f53\u524d\u5408\u5e76\u5b50\u6811\u7684\u5de6\u5b50\u6811\n                root1.right = find(root1.right, root2.right) # \u5904\u7406\u4e24\u6811\u7684\u5bf9\u5e94\u53f3\u5b50\u6811\n\n            elif root1 or root2:    # \u53ea\u5b58\u5728\u4e00\u4e2a\u8282\u70b9, \u76f4\u63a5\u8fd4\u56de\u5b58\u5728\u7684\u8282\u70b9\u5373\u53ef\n                return root1 if root1 else root2\n            else:\n                return None # \u5747\u4e0d\u5b58\u5728\u8fd4\u56deNone\n            return root1\n        t = find(t1, t2)\n        return t<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e24\u4e2a\u4e8c\u53c9\u6811\uff0c\u60f3\u8c61\u5f53\u4f60\u5c06\u5b83\u4eec\u4e2d\u7684\u4e00\u4e2a\u8986\u76d6\u5230\u53e6\u4e00\u4e2a\u4e0a\u65f6\uff0c\u4e24\u4e2a\u4e8c\u53c9\u6811\u7684\u4e00\u4e9b\u8282\u70b9\u4fbf\u4f1a\u91cd\u53e0\u3002 \u4f60\u9700\u8981\u5c06\u4ed6\u4eec\u5408\u5e76\u4e3a\u4e00\u4e2a&#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":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/535"}],"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=535"}],"version-history":[{"count":1,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/535\/revisions"}],"predecessor-version":[{"id":536,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/535\/revisions\/536"}],"wp:attachment":[{"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=535"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=535"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=535"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}