Introduction

In this blog post, we will explore how to solve the LeetCode problem "3238" using AI. LeetCode is a popular platform for preparing for coding interviews, and with the help of AI tools like Chatmagic, we can generate solutions quickly and efficiently - helping you pass the interviews and get the job offer without having to study for months.

Problem Statement

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

Explanation

• Count Color Frequencies per Player: Iterate through the pick array and store the frequency of each color picked by each player using a dictionary (or a similar data structure).
  • Check Winning Condition: For each player, iterate through the color frequencies and check if any color's frequency is greater than the player's index (i). If yes, the player wins.
  • Count Winners: Keep track of the number of players who win and return the final count.

• Time Complexity: O(n*m), where n is the number of players and m is the number of picks. Space Complexity: O(n*k), where k is the number of distinct colors (at most the number of picks).

Code

    def solve():
    n = int(input())
    pick = []
    for _ in range(int(input())):
        pick.append(list(map(int, input().split())))

    wins = 0
    for player in range(n):
        color_counts = {}
        for p in pick:
            if p[0] == player:
                color = p[1]
                if color not in color_counts:
                    color_counts[color] = 0
                color_counts[color] += 1

        won = False
        for color in color_counts:
            if color_counts[color] > player:
                won = True
                break

        if won:
            wins += 1

    print(wins)

# Taking input for n and pick array in one line (like in the examples) is not supported.  
# The code below simulates the problem described with input using multiple lines.

def main():
    n = int(input())
    m = int(input())
    picks = []
    for _ in range(m):
        picks.append(list(map(int, input().split())))

    wins = 0
    for player in range(n):
        color_counts = {}
        for p in picks:
            if p[0] == player:
                color = p[1]
                if color not in color_counts:
                    color_counts[color] = 0
                color_counts[color] += 1

        won = False
        for color in color_counts:
            if color_counts[color] > player:
                won = True
                break

        if won:
            wins += 1

    print(wins)

if __name__ == "__main__":
    main()