{ "data": { "question": { "questionId": "2213", "questionFrontendId": "2092", "categoryTitle": "Algorithms", "boundTopicId": 1122918, "title": "Find All People With Secret", "titleSlug": "find-all-people-with-secret", "content": "
You are given an integer n
indicating there are n
people numbered from 0
to n - 1
. You are also given a 0-indexed 2D integer array meetings
where meetings[i] = [xi, yi, timei]
indicates that person xi
and person yi
have a meeting at timei
. A person may attend multiple meetings at the same time. Finally, you are given an integer firstPerson
.
Person 0
has a secret and initially shares the secret with a person firstPerson
at time 0
. This secret is then shared every time a meeting takes place with a person that has the secret. More formally, for every meeting, if a person xi
has the secret at timei
, then they will share the secret with person yi
, and vice versa.
The secrets are shared instantaneously. That is, a person may receive the secret and share it with people in other meetings within the same time frame.
\n\nReturn a list of all the people that have the secret after all the meetings have taken place. You may return the answer in any order.
\n\n\n
Example 1:
\n\n\nInput: n = 6, meetings = [[1,2,5],[2,3,8],[1,5,10]], firstPerson = 1\nOutput: [0,1,2,3,5]\nExplanation:\nAt time 0, person 0 shares the secret with person 1.\nAt time 5, person 1 shares the secret with person 2.\nAt time 8, person 2 shares the secret with person 3.\nAt time 10, person 1 shares the secret with person 5.\nThus, people 0, 1, 2, 3, and 5 know the secret after all the meetings.\n\n\n
Example 2:
\n\n\nInput: n = 4, meetings = [[3,1,3],[1,2,2],[0,3,3]], firstPerson = 3\nOutput: [0,1,3]\nExplanation:\nAt time 0, person 0 shares the secret with person 3.\nAt time 2, neither person 1 nor person 2 know the secret.\nAt time 3, person 3 shares the secret with person 0 and person 1.\nThus, people 0, 1, and 3 know the secret after all the meetings.\n\n\n
Example 3:
\n\n\nInput: n = 5, meetings = [[3,4,2],[1,2,1],[2,3,1]], firstPerson = 1\nOutput: [0,1,2,3,4]\nExplanation:\nAt time 0, person 0 shares the secret with person 1.\nAt time 1, person 1 shares the secret with person 2, and person 2 shares the secret with person 3.\nNote that person 2 can share the secret at the same time as receiving it.\nAt time 2, person 3 shares the secret with person 4.\nThus, people 0, 1, 2, 3, and 4 know the secret after all the meetings.\n\n\n
\n
Constraints:
\n\n2 <= n <= 105
1 <= meetings.length <= 105
meetings[i].length == 3
0 <= xi, yi <= n - 1
xi != yi
1 <= timei <= 105
1 <= firstPerson <= n - 1
给你一个整数 n
,表示有 n
个专家从 0
到 n - 1
编号。另外给你一个下标从 0 开始的二维整数数组 meetings
,其中 meetings[i] = [xi, yi, timei]
表示专家 xi
和专家 yi
在时间 timei
要开一场会。一个专家可以同时参加 多场会议 。最后,给你一个整数 firstPerson
。
专家 0
有一个 秘密 ,最初,他在时间 0
将这个秘密分享给了专家 firstPerson
。接着,这个秘密会在每次有知晓这个秘密的专家参加会议时进行传播。更正式的表达是,每次会议,如果专家 xi
在时间 timei
时知晓这个秘密,那么他将会与专家 yi
分享这个秘密,反之亦然。
秘密共享是 瞬时发生 的。也就是说,在同一时间,一个专家不光可以接收到秘密,还能在其他会议上与其他专家分享。
\n\n在所有会议都结束之后,返回所有知晓这个秘密的专家列表。你可以按 任何顺序 返回答案。
\n\n\n\n
示例 1:
\n\n\n输入:n = 6, meetings = [[1,2,5],[2,3,8],[1,5,10]], firstPerson = 1\n输出:[0,1,2,3,5]\n解释:\n时间 0 ,专家 0 将秘密与专家 1 共享。\n时间 5 ,专家 1 将秘密与专家 2 共享。\n时间 8 ,专家 2 将秘密与专家 3 共享。\n时间 10 ,专家 1 将秘密与专家 5 共享。\n因此,在所有会议结束后,专家 0、1、2、3 和 5 都将知晓这个秘密。\n\n\n
示例 2:
\n\n\n输入:n = 4, meetings = [[3,1,3],[1,2,2],[0,3,3]], firstPerson = 3\n输出:[0,1,3]\n解释:\n时间 0 ,专家 0 将秘密与专家 3 共享。\n时间 2 ,专家 1 与专家 2 都不知晓这个秘密。\n时间 3 ,专家 3 将秘密与专家 0 和专家 1 共享。\n因此,在所有会议结束后,专家 0、1 和 3 都将知晓这个秘密。\n\n\n
示例 3:
\n\n\n输入:n = 5, meetings = [[3,4,2],[1,2,1],[2,3,1]], firstPerson = 1\n输出:[0,1,2,3,4]\n解释:\n时间 0 ,专家 0 将秘密与专家 1 共享。\n时间 1 ,专家 1 将秘密与专家 2 共享,专家 2 将秘密与专家 3 共享。\n注意,专家 2 可以在收到秘密的同一时间分享此秘密。\n时间 2 ,专家 3 将秘密与专家 4 共享。\n因此,在所有会议结束后,专家 0、1、2、3 和 4 都将知晓这个秘密。\n\n
\n\n
提示:
\n\n2 <= n <= 105
1 <= meetings.length <= 105
meetings[i].length == 3
0 <= xi, yi <= n - 1
xi != yi
1 <= timei <= 105
1 <= firstPerson <= n - 1
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