mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
28 KiB
JSON
180 lines
28 KiB
JSON
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"questionId": "129",
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"categoryTitle": "Algorithms",
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"boundTopicId": 1734,
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"title": "Sum Root to Leaf Numbers",
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"titleSlug": "sum-root-to-leaf-numbers",
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"content": "<p>You are given the <code>root</code> of a binary tree containing digits from <code>0</code> to <code>9</code> only.</p>\n\n<p>Each root-to-leaf path in the tree represents a number.</p>\n\n<ul>\n\t<li>For example, the root-to-leaf path <code>1 -> 2 -> 3</code> represents the number <code>123</code>.</li>\n</ul>\n\n<p>Return <em>the total sum of all root-to-leaf numbers</em>. Test cases are generated so that the answer will fit in a <strong>32-bit</strong> integer.</p>\n\n<p>A <strong>leaf</strong> node is a node with no children.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/02/19/num1tree.jpg\" style=\"width: 212px; height: 182px;\" />\n<pre>\n<strong>Input:</strong> root = [1,2,3]\n<strong>Output:</strong> 25\n<strong>Explanation:</strong>\nThe root-to-leaf path <code>1->2</code> represents the number <code>12</code>.\nThe root-to-leaf path <code>1->3</code> represents the number <code>13</code>.\nTherefore, sum = 12 + 13 = <code>25</code>.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/02/19/num2tree.jpg\" style=\"width: 292px; height: 302px;\" />\n<pre>\n<strong>Input:</strong> root = [4,9,0,5,1]\n<strong>Output:</strong> 1026\n<strong>Explanation:</strong>\nThe root-to-leaf path <code>4->9->5</code> represents the number 495.\nThe root-to-leaf path <code>4->9->1</code> represents the number 491.\nThe root-to-leaf path <code>4->0</code> represents the number 40.\nTherefore, sum = 495 + 491 + 40 = <code>1026</code>.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the tree is in the range <code>[1, 1000]</code>.</li>\n\t<li><code>0 <= Node.val <= 9</code></li>\n\t<li>The depth of the tree will not exceed <code>10</code>.</li>\n</ul>\n",
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"translatedTitle": "求根节点到叶节点数字之和",
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"translatedContent": "给你一个二叉树的根节点 <code>root</code> ，树中每个节点都存放有一个 <code>0</code> 到 <code>9</code> 之间的数字。\n<div class=\"original__bRMd\">\n<div>\n<p>每条从根节点到叶节点的路径都代表一个数字：</p>\n\n<ul>\n\t<li>例如，从根节点到叶节点的路径 <code>1 -> 2 -> 3</code> 表示数字 <code>123</code> 。</li>\n</ul>\n\n<p>计算从根节点到叶节点生成的 <strong>所有数字之和</strong> 。</p>\n\n<p><strong>叶节点</strong> 是指没有子节点的节点。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/02/19/num1tree.jpg\" style=\"width: 212px; height: 182px;\" />\n<pre>\n<strong>输入：</strong>root = [1,2,3]\n<strong>输出：</strong>25\n<strong>解释：</strong>\n从根到叶子节点路径 <code>1->2</code> 代表数字 <code>12</code>\n从根到叶子节点路径 <code>1->3</code> 代表数字 <code>13</code>\n因此，数字总和 = 12 + 13 = <code>25</code></pre>\n\n<p><strong>示例 2：</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/02/19/num2tree.jpg\" style=\"width: 292px; height: 302px;\" />\n<pre>\n<strong>输入：</strong>root = [4,9,0,5,1]\n<strong>输出：</strong>1026\n<strong>解释：</strong>\n从根到叶子节点路径 <code>4->9->5</code> 代表数字 495\n从根到叶子节点路径 <code>4->9->1</code> 代表数字 491\n从根到叶子节点路径 <code>4->0</code> 代表数字 40\n因此，数字总和 = 495 + 491 + 40 = <code>1026</code>\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li>树中节点的数目在范围 <code>[1, 1000]</code> 内</li>\n\t<li><code>0 <= Node.val <= 9</code></li>\n\t<li>树的深度不超过 <code>10</code></li>\n</ul>\n</div>\n</div>\n",
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