mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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188 lines
17 KiB
JSON
188 lines
17 KiB
JSON
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"questionId": "1547",
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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 class=\"example\">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 class=\"example\">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 class=\"example\">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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"difficulty": "Easy",
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"likes": 1440,
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"exampleTestcases": "[[\"London\",\"New York\"],[\"New York\",\"Lima\"],[\"Lima\",\"Sao Paulo\"]]\n[[\"B\",\"C\"],[\"D\",\"B\"],[\"C\",\"A\"]]\n[[\"A\",\"Z\"]]",
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"categoryTitle": "Algorithms",
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"name": "Hash Table",
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"lang": "C++",
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"code": "class Solution {\npublic:\n string destCity(vector<vector<string>>& paths) {\n \n }\n};",
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"lang": "Java",
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"langSlug": "java",
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"code": "class Solution {\n public String destCity(List<List<String>> paths) {\n \n }\n}",
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"__typename": "CodeSnippetNode"
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"lang": "Python",
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"langSlug": "python",
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"code": "class Solution(object):\n def destCity(self, paths):\n \"\"\"\n :type paths: List[List[str]]\n :rtype: str\n \"\"\"\n ",
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"lang": "Python3",
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"code": "class Solution:\n def destCity(self, paths: List[List[str]]) -> str:\n ",
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"code": "char* destCity(char*** paths, int pathsSize, int* pathsColSize) {\n \n}",
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"code": "public class Solution {\n public string DestCity(IList<IList<string>> paths) {\n \n }\n}",
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"code": "/**\n * @param {string[][]} paths\n * @return {string}\n */\nvar destCity = function(paths) {\n \n};",
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"code": "class Solution {\n\n /**\n * @param String[][] $paths\n * @return String\n */\n function destCity($paths) {\n \n }\n}",
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"lang": "Kotlin",
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"lang": "Dart",
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"lang": "Go",
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"langSlug": "golang",
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"code": "func destCity(paths [][]string) string {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {String[][]} paths\n# @return {String}\ndef dest_city(paths)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def destCity(paths: List[List[String]]): String = {\n \n }\n}",
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"lang": "Rust",
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"code": "impl Solution {\n pub fn dest_city(paths: Vec<Vec<String>>) -> String {\n \n }\n}",
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"lang": "Racket",
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"langSlug": "racket",
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"code": "(define/contract (dest-city paths)\n (-> (listof (listof string?)) string?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec dest_city(Paths :: [[unicode:unicode_binary()]]) -> unicode:unicode_binary().\ndest_city(Paths) ->\n .",
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"lang": "Elixir",
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"langSlug": "elixir",
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"code": "defmodule Solution do\n @spec dest_city(paths :: [[String.t]]) :: String.t\n def dest_city(paths) do\n \n end\nend",
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"hints": [
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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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],
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"solution": {
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"status": null,
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"sampleTestCase": "[[\"London\",\"New York\"],[\"New York\",\"Lima\"],[\"Lima\",\"Sao Paulo\"]]",
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"metaData": "{\n \"name\": \"destCity\",\n \"params\": [\n {\n \"name\": \"paths\",\n \"type\": \"list<list<string>>\"\n }\n ],\n \"return\": {\n \"type\": \"string\"\n }\n}",
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"envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 20 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code>OpenJDK 17</code>. Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. 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