mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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156 lines
26 KiB
JSON
156 lines
26 KiB
JSON
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"questionId": "133",
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"title": "Clone Graph",
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"content": "<p>Given a reference of a node in a <strong><a href=\"https://en.wikipedia.org/wiki/Connectivity_(graph_theory)#Connected_graph\" target=\"_blank\">connected</a></strong> undirected graph.</p>\n\n<p>Return a <a href=\"https://en.wikipedia.org/wiki/Object_copying#Deep_copy\" target=\"_blank\"><strong>deep copy</strong></a> (clone) of the graph.</p>\n\n<p>Each node in the graph contains a value (<code>int</code>) and a list (<code>List[Node]</code>) of its neighbors.</p>\n\n<pre>\nclass Node {\n public int val;\n public List<Node> neighbors;\n}\n</pre>\n\n<p> </p>\n\n<p><strong>Test case format:</strong></p>\n\n<p>For simplicity, each node's value is the same as the node's index (1-indexed). For example, the first node with <code>val == 1</code>, the second node with <code>val == 2</code>, and so on. The graph is represented in the test case using an adjacency list.</p>\n\n<p><b>An adjacency list</b> is a collection of unordered <b>lists</b> used to represent a finite graph. Each list describes the set of neighbors of a node in the graph.</p>\n\n<p>The given node will always be the first node with <code>val = 1</code>. You must return the <strong>copy of the given node</strong> as a reference to the cloned graph.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/04/133_clone_graph_question.png\" style=\"width: 454px; height: 500px;\" />\n<pre>\n<strong>Input:</strong> adjList = [[2,4],[1,3],[2,4],[1,3]]\n<strong>Output:</strong> [[2,4],[1,3],[2,4],[1,3]]\n<strong>Explanation:</strong> There are 4 nodes in the graph.\n1st node (val = 1)'s neighbors are 2nd node (val = 2) and 4th node (val = 4).\n2nd node (val = 2)'s neighbors are 1st node (val = 1) and 3rd node (val = 3).\n3rd node (val = 3)'s neighbors are 2nd node (val = 2) and 4th node (val = 4).\n4th node (val = 4)'s neighbors are 1st node (val = 1) and 3rd node (val = 3).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/01/07/graph.png\" style=\"width: 163px; height: 148px;\" />\n<pre>\n<strong>Input:</strong> adjList = [[]]\n<strong>Output:</strong> [[]]\n<strong>Explanation:</strong> Note that the input contains one empty list. The graph consists of only one node with val = 1 and it does not have any neighbors.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> adjList = []\n<strong>Output:</strong> []\n<strong>Explanation:</strong> This an empty graph, it does not have any nodes.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li>The number of nodes in the graph is in the range <code>[0, 100]</code>.</li>\n\t<li><code>1 <= Node.val <= 100</code></li>\n\t<li><code>Node.val</code> is unique for each node.</li>\n\t<li>There are no repeated edges and no self-loops in the graph.</li>\n\t<li>The Graph is connected and all nodes can be visited starting from the given node.</li>\n</ul>\n",
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"translatedTitle": "克隆图",
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"translatedContent": "<p>给你无向 <strong><a href=\"https://baike.baidu.com/item/连通图/6460995?fr=aladdin\" target=\"_blank\">连通</a> </strong>图中一个节点的引用，请你返回该图的 <a href=\"https://baike.baidu.com/item/深拷贝/22785317?fr=aladdin\" target=\"_blank\"><strong>深拷贝</strong></a>（克隆）。</p>\n\n<p>图中的每个节点都包含它的值 <code>val</code>（<code>int</code>） 和其邻居的列表（<code>list[Node]</code>）。</p>\n\n<pre>class Node {\n public int val;\n public List<Node> neighbors;\n}</pre>\n\n<p> </p>\n\n<p><strong>测试用例格式：</strong></p>\n\n<p>简单起见，每个节点的值都和它的索引相同。例如，第一个节点值为 1（<code>val = 1</code>），第二个节点值为 2（<code>val = 2</code>），以此类推。该图在测试用例中使用邻接列表表示。</p>\n\n<p><strong>邻接列表</strong> 是用于表示有限图的无序列表的集合。每个列表都描述了图中节点的邻居集。</p>\n\n<p>给定节点将始终是图中的第一个节点（值为 1）。你必须将 <strong>给定节点的拷贝 </strong>作为对克隆图的引用返回。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/02/01/133_clone_graph_question.png\" style=\"height: 500px; width: 500px;\"></p>\n\n<pre><strong>输入：</strong>adjList = [[2,4],[1,3],[2,4],[1,3]]\n<strong>输出：</strong>[[2,4],[1,3],[2,4],[1,3]]\n<strong>解释：\n</strong>图中有 4 个节点。\n节点 1 的值是 1，它有两个邻居：节点 2 和 4 。\n节点 2 的值是 2，它有两个邻居：节点 1 和 3 。\n节点 3 的值是 3，它有两个邻居：节点 2 和 4 。\n节点 4 的值是 4，它有两个邻居：节点 1 和 3 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/02/01/graph.png\" style=\"height: 148px; width: 163px;\"></p>\n\n<pre><strong>输入：</strong>adjList = [[]]\n<strong>输出：</strong>[[]]\n<strong>解释：</strong>输入包含一个空列表。该图仅仅只有一个值为 1 的节点，它没有任何邻居。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>adjList = []\n<strong>输出：</strong>[]\n<strong>解释：</strong>这个图是空的，它不含任何节点。\n</pre>\n\n<p><strong>示例 4：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/02/01/graph-1.png\" style=\"height: 133px; width: 272px;\"></p>\n\n<pre><strong>输入：</strong>adjList = [[2],[1]]\n<strong>输出：</strong>[[2],[1]]</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ol>\n\t<li>节点数不超过 100 。</li>\n\t<li>每个节点值 <code>Node.val</code> 都是唯一的，<code>1 <= Node.val <= 100</code>。</li>\n\t<li>无向图是一个<a href=\"https://baike.baidu.com/item/简单图/1680528?fr=aladdin\" target=\"_blank\">简单图</a>，这意味着图中没有重复的边，也没有自环。</li>\n\t<li>由于图是无向的，如果节点 <em>p</em> 是节点 <em>q</em> 的邻居，那么节点 <em>q</em> 也必须是节点 <em>p</em> 的邻居。</li>\n\t<li>图是连通图，你可以从给定节点访问到所有节点。</li>\n</ol>\n",
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