#2225

Find Players With Zero or One Losses

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Description

You are given an integer array matches where matches[i] = [winneri, loseri] indicates that the player winneri defeated player loseri in a match.

Return a list answer of size 2 where:

- answer[0] is a list of all players that have not lost any matches.

- answer[1] is a list of all players that have lost exactly one match.

The values in the two lists should be returned in increasing order.

Note:

- You should only consider the players that have played at least one match.

- The testcases will be generated such that no two matches will have the same outcome.

Example 1:

Input: matches = [[1,3],[2,3],[3,6],[5,6],[5,7],[4,5],[4,8],[4,9],[10,4],[10,9]]

Output: [[1,2,10],[4,5,7,8]]

Explanation:

Players 1, 2, and 10 have not lost any matches.

Players 4, 5, 7, and 8 each have lost one match.

Players 3, 6, and 9 each have lost two matches.

Thus, answer[0] = [1,2,10] and answer[1] = [4,5,7,8].

Example 2:

Input: matches = [[2,3],[1,3],[5,4],[6,4]]

Output: [[1,2,5,6],[]]

Explanation:

Players 1, 2, 5, and 6 have not lost any matches.

Players 3 and 4 each have lost two matches.

Thus, answer[0] = [1,2,5,6] and answer[1] = [].

Solution