{ "data": { "question": { "questionId": "3189", "questionFrontendId": "2924", "boundTopicId": null, "title": "Find Champion II", "titleSlug": "find-champion-ii", "content": "

There are n teams numbered from 0 to n - 1 in a tournament; each team is also a node in a DAG.

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You are given the integer n and a 0-indexed 2D integer array edges of length m representing the DAG, where edges[i] = [ui, vi] indicates that there is a directed edge from team ui to team vi in the graph.

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A directed edge from a to b in the graph means that team a is stronger than team b and team b is weaker than team a.

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Team a will be the champion of the tournament if there is no team b that is stronger than team a.

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Return the team that will be the champion of the tournament if there is a unique champion, otherwise, return -1.

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Notes

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Example 1:

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\nInput: n = 3, edges = [[0,1],[1,2]]\nOutput: 0\nExplanation: Team 1 is weaker than team 0. Team 2 is weaker than team 1. So the champion is team 0.\n
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Example 2:

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\nInput: n = 4, edges = [[0,2],[1,3],[1,2]]\nOutput: -1\nExplanation: Team 2 is weaker than team 0 and team 1. Team 3 is weaker than team 1. But team 1 and team 0 are not weaker than any other teams. So the answer is -1.\n
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Constraints:

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