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"translatedContent": "<p>有一个具有 <code>n</code>个顶点的 <strong>双向</strong> 图,其中每个顶点标记从 <code>0</code> 到 <code>n - 1</code>(包含 <code>0</code> 和 <code>n - 1</code>)。图中的边用一个二维整数数组 <code>edges</code> 表示,其中 <code>edges[i] = [u<sub>i</sub>, v<sub>i</sub>]</code> 表示顶点 <code>ui</code> 和顶点 <code>vi</code> 之间的双向边。 每个顶点对由 <strong>最多一条</strong> 边连接,并且没有顶点存在与自身相连的边。</p>\n\n<p>请你确定是否存在从顶点 <code>start</code> 开始,到顶点 <code>end</code> 结束的 <strong>有效路径</strong> 。</p>\n\n<p>给你数组 <code>edges</code> 和整数 <code>n</code>、<code>start</code>和<code>end</code>,如果从 <code>start</code> 到 <code>end</code> 存在 <strong>有效路径</strong> ,则返回 <code>true</code>,否则返回 <code>false</code> 。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/08/14/validpath-ex1.png\" style=\"width: 141px; height: 121px;\" />\n<pre>\n<strong>输入:</strong>n = 3, edges = [[0,1],[1,2],[2,0]], start = 0, end = 2\n<strong>输出:</strong>true\n<strong>解释:</strong>存在由顶点 0 到顶点 2 的路径:\n- 0 → 1 → 2 \n- 0 → 2\n</pre>\n\n<p><strong>示例 2</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/08/14/validpath-ex2.png\" style=\"width: 281px; height: 141px;\" />\n<pre>\n<strong>输入:</strong>n = 6, edges = [[0,1],[0,2],[3,5],[5,4],[4,3]], start = 0, end = 5\n<strong>输出:</strong>false\n<strong>解释:</strong>不存在由顶点 0 到顶点 5 的路径.\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;= 2 * 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;= u<sub>i</sub>, v<sub>i</sub> &lt;= n - 1</code></li>\n\t<li><code>u<sub>i</sub> != v<sub>i</sub></code></li>\n\t<li><code>0 &lt;= start, end &lt;= n - 1</code></li>\n\t<li>不存在双向边</li>\n\t<li>不存在指向顶点自身的边</li>\n</ul>\n",
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