mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-11 02:58:13 +08:00
171 lines
21 KiB
JSON
171 lines
21 KiB
JSON
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"questionId": "1547",
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"questionFrontendId": "1436",
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"categoryTitle": "Algorithms",
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"boundTopicId": 225379,
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"title": "Destination City",
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"titleSlug": "destination-city",
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"content": "<p>You are given the array <code>paths</code>, where <code>paths[i] = [cityA<sub>i</sub>, cityB<sub>i</sub>]</code> means there exists a direct path going from <code>cityA<sub>i</sub></code> to <code>cityB<sub>i</sub></code>. <em>Return the destination city, that is, the city without any path outgoing to another city.</em></p>\n\n<p>It is guaranteed that the graph of paths forms a line without any loop, therefore, there will be exactly one destination city.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> paths = [["London","New York"],["New York","Lima"],["Lima","Sao Paulo"]]\n<strong>Output:</strong> "Sao Paulo" \n<strong>Explanation:</strong> Starting at "London" city you will reach "Sao Paulo" city which is the destination city. Your trip consist of: "London" -> "New York" -> "Lima" -> "Sao Paulo".\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> paths = [["B","C"],["D","B"],["C","A"]]\n<strong>Output:</strong> "A"\n<strong>Explanation:</strong> All possible trips are: \n"D" -> "B" -> "C" -> "A". \n"B" -> "C" -> "A". \n"C" -> "A". \n"A". \nClearly the destination city is "A".\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> paths = [["A","Z"]]\n<strong>Output:</strong> "Z"\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= paths.length <= 100</code></li>\n\t<li><code>paths[i].length == 2</code></li>\n\t<li><code>1 <= cityA<sub>i</sub>.length, cityB<sub>i</sub>.length <= 10</code></li>\n\t<li><code>cityA<sub>i</sub> != cityB<sub>i</sub></code></li>\n\t<li>All strings consist of lowercase and uppercase English letters and the space character.</li>\n</ul>\n",
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"translatedTitle": "旅行终点站",
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"translatedContent": "<p>给你一份旅游线路图，该线路图中的旅行线路用数组 <code>paths</code> 表示，其中 <code>paths[i] = [cityA<sub>i</sub>, cityB<sub>i</sub>]</code> 表示该线路将会从 <code>cityA<sub>i</sub></code> 直接前往 <code>cityB<sub>i</sub></code> 。请你找出这次旅行的终点站，即没有任何可以通往其他城市的线路的城市<em>。</em></p>\n\n<p>题目数据保证线路图会形成一条不存在循环的线路，因此恰有一个旅行终点站。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>paths = [[\"London\",\"New York\"],[\"New York\",\"Lima\"],[\"Lima\",\"Sao Paulo\"]]\n<strong>输出：</strong>\"Sao Paulo\" \n<strong>解释：</strong>从 \"London\" 出发，最后抵达终点站 \"Sao Paulo\" 。本次旅行的路线是 \"London\" -> \"New York\" -> \"Lima\" -> \"Sao Paulo\" 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>paths = [[\"B\",\"C\"],[\"D\",\"B\"],[\"C\",\"A\"]]\n<strong>输出：</strong>\"A\"\n<strong>解释：</strong>所有可能的线路是：\n\"D\" -> \"B\" -> \"C\" -> \"A\". \n\"B\" -> \"C\" -> \"A\". \n\"C\" -> \"A\". \n\"A\". \n显然，旅行终点站是 \"A\" 。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>paths = [[\"A\",\"Z\"]]\n<strong>输出：</strong>\"Z\"\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 <= paths.length <= 100</code></li>\n\t<li><code>paths[i].length == 2</code></li>\n\t<li><code>1 <= cityA<sub>i</sub>.length, cityB<sub>i</sub>.length <= 10</code></li>\n\t<li><code>cityA<sub>i </sub>!= cityB<sub>i</sub></code></li>\n\t<li>所有字符串均由大小写英文字母和空格字符组成。</li>\n</ul>\n",
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"Start in any city and use the path to move to the next city.",
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"Eventually, you will reach a city with no path outgoing, this is the destination city."
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"sampleTestCase": "[[\"London\",\"New York\"],[\"New York\",\"Lima\"],[\"Lima\",\"Sao Paulo\"]]",
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