mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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178 lines
26 KiB
JSON
178 lines
26 KiB
JSON
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"questionId": "1021",
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"categoryTitle": "Algorithms",
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"boundTopicId": 2866,
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"title": "Distribute Coins in Binary Tree",
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"titleSlug": "distribute-coins-in-binary-tree",
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"content": "<p>You are given the <code>root</code> of a binary tree with <code>n</code> nodes where each <code>node</code> in the tree has <code>node.val</code> coins. There are <code>n</code> coins in total throughout the whole tree.</p>\n\n<p>In one move, we may choose two adjacent nodes and move one coin from one node to another. A move may be from parent to child, or from child to parent.</p>\n\n<p>Return <em>the <strong>minimum</strong> number of moves required to make every node have <strong>exactly</strong> one coin</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/18/tree1.png\" style=\"width: 250px; height: 236px;\" />\n<pre>\n<strong>Input:</strong> root = [3,0,0]\n<strong>Output:</strong> 2\n<strong>Explanation: </strong>From the root of the tree, we move one coin to its left child, and one coin to its right child.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/01/18/tree2.png\" style=\"width: 250px; height: 236px;\" />\n<pre>\n<strong>Input:</strong> root = [0,3,0]\n<strong>Output:</strong> 3\n<strong>Explanation: </strong>From the left child of the root, we move two coins to the root [taking two moves]. Then, we move one coin from the root of the tree to the right child.\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 <code>n</code>.</li>\n\t<li><code>1 <= n <= 100</code></li>\n\t<li><code>0 <= Node.val <= n</code></li>\n\t<li>The sum of all <code>Node.val</code> is <code>n</code>.</li>\n</ul>\n",
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"translatedTitle": "在二叉树中分配硬币",
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"translatedContent": "<p>给定一个有 <code>N</code> 个结点的二叉树的根结点 <code>root</code>，树中的每个结点上都对应有 <code>node.val</code> 枚硬币，并且总共有 <code>N</code> 枚硬币。</p>\n\n<p>在一次移动中，我们可以选择两个相邻的结点，然后将一枚硬币从其中一个结点移动到另一个结点。(移动可以是从父结点到子结点，或者从子结点移动到父结点。)。</p>\n\n<p>返回使每个结点上只有一枚硬币所需的移动次数。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/01/19/tree1.png\" style=\"height: 142px; width: 150px;\"></strong></p>\n\n<pre><strong>输入：</strong>[3,0,0]\n<strong>输出：</strong>2\n<strong>解释：</strong>从树的根结点开始，我们将一枚硬币移到它的左子结点上，一枚硬币移到它的右子结点上。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/01/19/tree2.png\" style=\"height: 142px; width: 150px;\"></strong></p>\n\n<pre><strong>输入：</strong>[0,3,0]\n<strong>输出：</strong>3\n<strong>解释：</strong>从根结点的左子结点开始，我们将两枚硬币移到根结点上 [移动两次]。然后，我们把一枚硬币从根结点移到右子结点上。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/01/19/tree3.png\" style=\"height: 142px; width: 150px;\"></strong></p>\n\n<pre><strong>输入：</strong>[1,0,2]\n<strong>输出：</strong>2\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/01/19/tree4.png\" style=\"height: 156px; width: 155px;\"></strong></p>\n\n<pre><strong>输入：</strong>[1,0,0,null,3]\n<strong>输出：</strong>4\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ol>\n\t<li><code>1<= N <= 100</code></li>\n\t<li><code>0 <= node.val <= N</code></li>\n</ol>\n",
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