leetcode-problemset/leetcode-cn/originData/count-unreachable-pairs-of-nodes-in-an-undirected-graph.json

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            "questionId": "2403",
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            "categoryTitle": "Algorithms",
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            "title": "Count Unreachable Pairs of Nodes in an Undirected Graph",
            "titleSlug": "count-unreachable-pairs-of-nodes-in-an-undirected-graph",
            "content": "<p>You are given an integer <code>n</code>. There is an <strong>undirected</strong> graph with <code>n</code> nodes, numbered from <code>0</code> to <code>n - 1</code>. You are given a 2D integer array <code>edges</code> where <code>edges[i] = [a<sub>i</sub>, b<sub>i</sub>]</code> denotes that there exists an <strong>undirected</strong> edge connecting nodes <code>a<sub>i</sub></code> and <code>b<sub>i</sub></code>.</p>\n\n<p>Return <em>the <strong>number of pairs</strong> of different nodes that are <strong>unreachable</strong> from each other</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/05/05/tc-3.png\" style=\"width: 267px; height: 169px;\" />\n<pre>\n<strong>Input:</strong> n = 3, edges = [[0,1],[0,2],[1,2]]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no pairs of nodes that are unreachable from each other. Therefore, we return 0.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/05/05/tc-2.png\" style=\"width: 295px; height: 269px;\" />\n<pre>\n<strong>Input:</strong> n = 7, edges = [[0,2],[0,5],[2,4],[1,6],[5,4]]\n<strong>Output:</strong> 14\n<strong>Explanation:</strong> There are 14 pairs of nodes that are unreachable from each other:\n[[0,1],[0,3],[0,6],[1,2],[1,3],[1,4],[1,5],[2,3],[2,6],[3,4],[3,5],[3,6],[4,6],[5,6]].\nTherefore, we return 14.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>0 &lt;= edges.length &lt;= 2 * 10<sup>5</sup></code></li>\n\t<li><code>edges[i].length == 2</code></li>\n\t<li><code>0 &lt;= a<sub>i</sub>, b<sub>i</sub> &lt; n</code></li>\n\t<li><code>a<sub>i</sub> != b<sub>i</sub></code></li>\n\t<li>There are no repeated edges.</li>\n</ul>\n",
            "translatedTitle": "统计无向图中无法互相到达点对数",
            "translatedContent": "<p>给你一个整数&nbsp;<code>n</code>&nbsp;，表示一张<strong>&nbsp;无向图</strong>&nbsp;中有 <code>n</code>&nbsp;个节点，编号为&nbsp;<code>0</code>&nbsp;到&nbsp;<code>n - 1</code>&nbsp;。同时给你一个二维整数数组&nbsp;<code>edges</code>&nbsp;，其中&nbsp;<code>edges[i] = [a<sub>i</sub>, b<sub>i</sub>]</code>&nbsp;表示节点&nbsp;<code>a<sub>i</sub></code> 和&nbsp;<code>b<sub>i</sub></code>&nbsp;之间有一条&nbsp;<strong>无向</strong>&nbsp;边。</p>\n\n<p>请你返回 <strong>无法互相到达</strong>&nbsp;的不同 <strong>点对数目</strong>&nbsp;。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/05/05/tc-3.png\" style=\"width: 267px; height: 169px;\"></p>\n\n<pre><b>输入：</b>n = 3, edges = [[0,1],[0,2],[1,2]]\n<b>输出：</b>0\n<b>解释：</b>所有点都能互相到达，意味着没有点对无法互相到达，所以我们返回 0 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/05/05/tc-2.png\" style=\"width: 295px; height: 269px;\"></p>\n\n<pre><b>输入：</b>n = 7, edges = [[0,2],[0,5],[2,4],[1,6],[5,4]]\n<b>输出：</b>14\n<b>解释：</b>总共有 14 个点对互相无法到达：\n[[0,1],[0,3],[0,6],[1,2],[1,3],[1,4],[1,5],[2,3],[2,6],[3,4],[3,5],[3,6],[4,6],[5,6]]\n所以我们返回 14 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>0 &lt;= edges.length &lt;= 2 * 10<sup>5</sup></code></li>\n\t<li><code>edges[i].length == 2</code></li>\n\t<li><code>0 &lt;= a<sub>i</sub>, b<sub>i</sub> &lt; n</code></li>\n\t<li><code>a<sub>i</sub> != b<sub>i</sub></code></li>\n\t<li>不会有重复边。</li>\n</ul>\n",
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                "Find the connected components of the graph. To find connected components, you can use Union Find (Disjoint Sets), BFS, or DFS.",
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