leetcode-problemset/leetcode-cn/originData/longest-cycle-in-a-graph.json

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            "title": "Longest Cycle in a Graph",
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            "content": "<p>You are given a <strong>directed</strong> graph of <code>n</code> nodes numbered from <code>0</code> to <code>n - 1</code>, where each node has <strong>at most one</strong> outgoing edge.</p>\n\n<p>The graph is represented with a given <strong>0-indexed</strong> array <code>edges</code> of size <code>n</code>, indicating that there is a directed edge from node <code>i</code> to node <code>edges[i]</code>. If there is no outgoing edge from node <code>i</code>, then <code>edges[i] == -1</code>.</p>\n\n<p>Return <em>the length of the <strong>longest</strong> cycle in the graph</em>. If no cycle exists, return <code>-1</code>.</p>\n\n<p>A cycle is a path that starts and ends at the <strong>same</strong> node.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/06/08/graph4drawio-5.png\" style=\"width: 335px; height: 191px;\" />\n<pre>\n<strong>Input:</strong> edges = [3,3,4,2,3]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> The longest cycle in the graph is the cycle: 2 -&gt; 4 -&gt; 3 -&gt; 2.\nThe length of this cycle is 3, so 3 is returned.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/06/07/graph4drawio-1.png\" style=\"width: 171px; height: 161px;\" />\n<pre>\n<strong>Input:</strong> edges = [2,-1,3,1]\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> There are no cycles in this graph.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == edges.length</code></li>\n\t<li><code>2 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>-1 &lt;= edges[i] &lt; n</code></li>\n\t<li><code>edges[i] != i</code></li>\n</ul>\n",
            "translatedTitle": "图中的最长环",
            "translatedContent": "<p>给你一个 <code>n</code>&nbsp;个节点的 <b>有向图</b>&nbsp;，节点编号为&nbsp;<code>0</code>&nbsp;到&nbsp;<code>n - 1</code>&nbsp;，其中每个节点&nbsp;<strong>至多</strong>&nbsp;有一条出边。</p>\n\n<p>图用一个大小为 <code>n</code>&nbsp;下标从<strong>&nbsp;0</strong>&nbsp;开始的数组&nbsp;<code>edges</code>&nbsp;表示，节点 <code>i</code>&nbsp;到节点&nbsp;<code>edges[i]</code>&nbsp;之间有一条有向边。如果节点&nbsp;<code>i</code>&nbsp;没有出边，那么&nbsp;<code>edges[i] == -1</code>&nbsp;。</p>\n\n<p>请你返回图中的 <strong>最长</strong>&nbsp;环，如果没有任何环，请返回 <code>-1</code>&nbsp;。</p>\n\n<p>一个环指的是起点和终点是 <strong>同一个</strong>&nbsp;节点的路径。</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/2022/06/08/graph4drawio-5.png\" style=\"width: 335px; height: 191px;\" /></p>\n\n<pre>\n<b>输入：</b>edges = [3,3,4,2,3]\n<b>输出去：</b>3\n<b>解释：</b>图中的最长环是：2 -&gt; 4 -&gt; 3 -&gt; 2 。\n这个环的长度为 3 ，所以返回 3 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/06/07/graph4drawio-1.png\" style=\"width: 171px; height: 161px;\" /></p>\n\n<pre>\n<b>输入：</b>edges = [2,-1,3,1]\n<b>输出：</b>-1\n<b>解释：</b>图中没有任何环。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>n == edges.length</code></li>\n\t<li><code>2 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>-1 &lt;= edges[i] &lt; n</code></li>\n\t<li><code>edges[i] != i</code></li>\n</ul>\n",
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