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{
"data": {
"question": {
"questionId": "1000477",
"questionFrontendId": "LCP 62",
"categoryTitle": "Algorithms",
"boundTopicId": 1845920,
"title": "交通枢纽",
"titleSlug": "D9PW8w",
"content": "English description is not available for the problem. Please switch to Chinese.",
"translatedTitle": "交通枢纽",
"translatedContent": "为了缓解「力扣嘉年华」期间的人流压力,组委会在活动期间开设了一些交通专线。`path[i] = [a, b]` 表示有一条从地点 `a`通往地点 `b` 的 **单向** 交通专线。\n若存在一个地点满足以下要求我们则称之为 **交通枢纽**\n- 所有地点(除自身外)均有一条 **单向** 专线 **直接** 通往该地点;\n- 该地点不存在任何 **通往其他地点** 的单向专线。\n\n请返回交通专线的 **交通枢纽**。若不存在,则返回 `-1`。\n\n**注意:**\n- 对于任意一个地点,至少被一条专线连通。\n\n**示例 1**\n>输入:`path = [[0,1],[0,3],[1,3],[2,0],[2,3]]`\n>\n>输出:`3`\n>\n>解释:如下图所示:\n> 地点 `0,1,2` 各有一条通往地点 `3` 的交通专线,\n> 且地点 `3` 不存在任何**通往其他地点**的交通专线。\n>![image.png](https://pic.leetcode-cn.com/1663902572-yOlUCr-image.png){:width=200px}\n\n\n**示例 2**\n>输入:`path = [[0,3],[1,0],[1,3],[2,0],[3,0],[3,2]]`\n>\n>输出:`-1`\n>\n>解释:如下图所示:不存在满足 **交通枢纽** 的地点。\n>![image.png](https://pic.leetcode-cn.com/1663902595-McsEkY-image.png){:width=200px}\n\n**提示:**\n- `1 <= path.length <= 1000`\n- `0 <= path[i][0], path[i][1] <= 1000`\n- `path[i][0]` 与 `path[i][1]` 不相等",
"isPaidOnly": false,
"difficulty": "Medium",
"likes": 10,
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"isLiked": null,
"similarQuestions": "[]",
"contributors": [
{
"username": "LeetCode",
"profileUrl": "/u/leetcode",
"avatarUrl": "https://assets.leetcode.cn/aliyun-lc-upload/uploaded_files/2021/03/73c9f099-abbe-4d94-853f-f8abffd459cd/leetcode.png",
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"topicTags": [
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{
"lang": "C++",
"langSlug": "cpp",
"code": "class Solution {\npublic:\n int transportationHub(vector<vector<int>>& path) {\n\n }\n};",
"__typename": "CodeSnippetNode"
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"lang": "Java",
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"code": "class Solution {\n public int transportationHub(int[][] path) {\n\n }\n}",
"__typename": "CodeSnippetNode"
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{
"lang": "Python",
"langSlug": "python",
"code": "class Solution(object):\n def transportationHub(self, path):\n \"\"\"\n :type path: List[List[int]]\n :rtype: int\n \"\"\"",
"__typename": "CodeSnippetNode"
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{
"lang": "Python3",
"langSlug": "python3",
"code": "class Solution:\n def transportationHub(self, path: List[List[int]]) -> int:",
"__typename": "CodeSnippetNode"
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{
"lang": "C",
"langSlug": "c",
"code": "\n\nint transportationHub(int** path, int pathSize, int* pathColSize){\n\n}",
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{
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"code": "public class Solution {\n public int TransportationHub(int[][] path) {\n\n }\n}",
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{
"lang": "JavaScript",
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"code": "/**\n * @param {number[][]} path\n * @return {number}\n */\nvar transportationHub = function(path) {\n\n};",
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"code": "function transportationHub(path: number[][]): number {\n\n};",
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"langSlug": "php",
"code": "class Solution {\n\n /**\n * @param Integer[][] $path\n * @return Integer\n */\n function transportationHub($path) {\n\n }\n}",
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"code": "class Solution {\n fun transportationHub(path: Array<IntArray>): Int {\n\n }\n}",
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"code": "func transportationHub(path [][]int) int {\n\n}",
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"code": "object Solution {\n def transportationHub(path: Array[Array[Int]]): Int = {\n\n }\n}",
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"lang": "Rust",
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"code": "impl Solution {\n pub fn transportation_hub(path: Vec<Vec<i32>>) -> i32 {\n\n }\n}",
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"lang": "Racket",
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