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"translatedContent": "<p>给你一个数组 <code>routes</code> ,表示一系列公交线路,其中每个 <code>routes[i]</code> 表示一条公交线路,第 <code>i</code> 辆公交车将会在上面循环行驶。</p>\n\n<ul>\n\t<li>例如,路线 <code>routes[0] = [1, 5, 7]</code> 表示第 <code>0</code> 辆公交车会一直按序列 <code>1 -> 5 -> 7 -> 1 -> 5 -> 7 -> 1 -> ...</code> 这样的车站路线行驶。</li>\n</ul>\n\n<p>现在从 <code>source</code> 车站出发(初始时不在公交车上),要前往 <code>target</code> 车站。 期间仅可乘坐公交车。</p>\n\n<p>求出 <strong>最少乘坐的公交车数量</strong> 。如果不可能到达终点车站,返回 <code>-1</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1</strong></p>\n\n<pre>\n<strong>输入:</strong>routes = [[1,2,7],[3,6,7]], source = 1, target = 6\n<strong>输出:</strong>2\n<strong>解释:</strong>最优策略是先乘坐第一辆公交车到达车站 7 , 然后换乘第二辆公交车到车站 6 。 \n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre>\n<strong>输入:</strong>routes = [[7,12],[4,5,15],[6],[15,19],[9,12,13]], source = 15, target = 12\n<strong>输出:</strong>-1\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= routes.length <= 500</code>.</li>\n\t<li><code>1 <= routes[i].length <= 10<sup>5</sup></code></li>\n\t<li><code>routes[i]</code> 中的所有值 <strong>互不相同</strong></li>\n\t<li><code>sum(routes[i].length) <= 10<sup>5</sup></code></li>\n\t<li><code>0 <= routes[i][j] < 10<sup>6</sup></code></li>\n\t<li><code>0 <= source, target < 10<sup>6</sup></code></li>\n</ul>\n",
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