LeetCode 3175: Find The First Player to win K Games in a Row Solution

Master LeetCode problem 3175 (Find The First Player to win K Games in a Row), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

3175. Find The First Player to win K Games in a Row

Medium

Array Simulation

Problem Explanation

Explanation

To find the first player to win k games in a row, we can simulate the competition process by using a queue to keep track of the players. We will iterate through the players, playing games until we find a player who wins k games in a row. We will track the current winning streak and reset it whenever a player loses. Once we find a player who wins k games in a row, we return their initial index.

Algorithm:

Create a queue to store the indices of the players.
Initialize variables for current winning streak and the player who won k games in a row.
Iterate through the players:
- Compare the skill levels of the first two players in the queue.
- If the player with higher skill level wins, move them to the front of the queue and increment the winning streak.
- If the winning streak equals k, return the initial index of the winning player.
- Otherwise, move the losing player to the end of the queue and reset the winning streak.
If no player wins k games in a row, return -1.

Time Complexity:

The time complexity of this algorithm is O(n), where n is the number of players.

Space Complexity:

The space complexity is O(n) to store the queue of players.

Solution Code

class Solution {
    public int findTheWinner(int[] skills, int k) {
        Queue<Integer> queue = new LinkedList<>();
        for (int i = 0; i < skills.length; i++) {
            queue.offer(i);
        }
        
        int winningStreak = 0;
        int winner = -1;
        
        while (!queue.isEmpty()) {
            int player1 = queue.poll();
            int player2 = queue.poll();
            
            if (skills[player1] > skills[player2]) {
                queue.offer(player1);
                winningStreak++;
            } else {
                queue.offer(player2);
                winningStreak = 1;
            }
            
            if (winningStreak == k) {
                winner = queue.peek();
                break;
            }
        }
        
        return winner;
    }
}

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