{"id":583,"date":"2020-09-26T11:00:05","date_gmt":"2020-09-26T03:00:05","guid":{"rendered":"http:\/\/39.96.58.60\/?p=583"},"modified":"2022-10-18T16:38:45","modified_gmt":"2022-10-18T08:38:45","slug":"leetcode-112-%e8%b7%af%e5%be%84%e6%80%bb%e5%92%8c","status":"publish","type":"post","link":"http:\/\/www.yatenglg.cn\/blog\/?p=583","title":{"rendered":"Leetcode 112. \u8def\u5f84\u603b\u548c"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\u548c\u4e00\u4e2a\u76ee\u6807\u548c\uff0c\u5224\u65ad\u8be5\u6811\u4e2d\u662f\u5426\u5b58\u5728\u6839\u8282\u70b9\u5230\u53f6\u5b50\u8282\u70b9\u7684\u8def\u5f84\uff0c\u8fd9\u6761\u8def\u5f84\u4e0a\u6240\u6709\u8282\u70b9\u503c\u76f8\u52a0\u7b49\u4e8e\u76ee\u6807\u548c\u3002<\/p>\n<p><strong>\u8bf4\u660e:<\/strong>&nbsp;\u53f6\u5b50\u8282\u70b9\u662f\u6307\u6ca1\u6709\u5b50\u8282\u70b9\u7684\u8282\u70b9\u3002<\/p>\n<p><strong>\u793a\u4f8b:<\/strong>&nbsp;<\/p>\n<p>\u7ed9\u5b9a\u5982\u4e0b\u4e8c\u53c9\u6811\uff0c\u4ee5\u53ca\u76ee\u6807\u548c <code>sum = 22<\/code>\uff0c<\/p>\n<pre>              <strong>5<\/strong>\n\n             \/ \\\n\n            <strong>4 <\/strong>  8\n\n           \/   \/ \\\n\n          <strong>11 <\/strong> 13  4\n\n         \/  \\      \\\n\n        7    <strong>2<\/strong>      1\n\n<\/pre>\n<p>\u8fd4\u56de <code>true<\/code>, \u56e0\u4e3a\u5b58\u5728\u76ee\u6807\u548c\u4e3a 22 \u7684\u6839\u8282\u70b9\u5230\u53f6\u5b50\u8282\u70b9\u7684\u8def\u5f84 <code>5-&gt;4-&gt;11-&gt;2<\/code>\u3002<\/p>\n<p>**\u96be\u5ea6**: Easy<\/p>\n<p>**\u6807\u7b7e**: \u6811\u3001 \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\uff1a48 ms, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8694.04% \u7684\u7528\u6237\n\u5185\u5b58\u6d88\u8017\uff1a15.3 MB, \u5728\u6240\u6709 Python3 \u63d0\u4ea4\u4e2d\u51fb\u8d25\u4e8626.11% \u7684\u7528\u6237\n\n\u89e3\u9898\u601d\u8def\uff1a\n    \u9012\u5f52\n    \u5177\u4f53\u5b9e\u73b0\u89c1\u4ee3\u7801\u6ce8\u91ca\n\"\"\"\nclass Solution:\n    def hasPathSum(self, root: TreeNode, sum: int) -&gt; bool:\n        def find(root, current):\n            if root:\n                current += root.val\n                if root.left:\n                    if find(root.left, current):    # \u5904\u7406\u5de6\u5b50\u6811\n                        return True\n                if root.right:\n                    if find(root.right, current):   # \u5904\u7406\u53f3\u5b50\u6811\n                        return True\n                if not (root.left or root.right):   # \u5982\u679c\u662f\u53f6\u8282\u70b9\uff0c\u5224\u65ad\u5f53\u524d\u548c\n                    if current == sum:\n                        return True\n        if find(root, 0):\n            return True\n        else:\n            return False<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u4e8c\u53c9\u6811\u548c\u4e00\u4e2a\u76ee\u6807\u548c\uff0c\u5224\u65ad\u8be5\u6811\u4e2d\u662f\u5426\u5b58\u5728\u6839\u8282\u70b9\u5230\u53f6\u5b50\u8282\u70b9\u7684\u8def\u5f84\uff0c\u8fd9\u6761\u8def\u5f84\u4e0a\u6240\u6709\u8282\u70b9\u503c\u76f8\u52a0\u7b49\u4e8e\u76ee\u6807\u548c\u3002 \u8bf4&#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\/583"}],"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=583"}],"version-history":[{"count":1,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/583\/revisions"}],"predecessor-version":[{"id":584,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=\/wp\/v2\/posts\/583\/revisions\/584"}],"wp:attachment":[{"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=583"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.yatenglg.cn\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}