3238. Find the Number of Winning Players

Problem Link

Description

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You are given an integer n representing the number of players in a game and a 2D array pick where pick[i] = [xi, yi] represents that the player xi picked a ball of color yi.

Player i wins the game if they pick strictly more than i balls of the same color. In other words,

• Player 0 wins if they pick any ball.
• Player 1 wins if they pick at least two balls of the same color.
• ...
• Player i wins if they pick at leasti + 1 balls of the same color.

Return the number of players who win the game.

Note that multiple players can win the game.

 

Example 1:

Input: n = 4, pick = [[0,0],[1,0],[1,0],[2,1],[2,1],[2,0]]

Output: 2

Explanation:

Player 0 and player 1 win the game, while players 2 and 3 do not win.

Example 2:

Input: n = 5, pick = [[1,1],[1,2],[1,3],[1,4]]

Output: 0

Explanation:

No player wins the game.

Example 3:

Input: n = 5, pick = [[1,1],[2,4],[2,4],[2,4]]

Output: 1

Explanation:

Player 2 wins the game by picking 3 balls with color 4.

 

Constraints:

• 2 <= n <= 10
• 1 <= pick.length <= 100
• pick[i].length == 2
• 0 <= xi <= n - 1
• 0 <= yi <= 10

Solution

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Python3

class Solution:
    def winningPlayerCount(self, n: int, pick: List[List[int]]) -> int:
        players = defaultdict(lambda : defaultdict(int))
        res = 0
 
        for x, y in pick:
            players[x][y] += 1
        
        for player in players.keys():
            ok = False
 
            for v in players[player].values():
                if v > player:
                    ok = True
                    break
 
            if ok:
                res += 1
        
        return res