Introduction

In this blog post, we will explore how to solve the LeetCode problem "3175" 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

A competition consists of n players numbered from 0 to n - 1. You are given an integer array skills of size n and a positive integer k, where skills[i] is the skill level of player i. All integers in skills are unique. All players are standing in a queue in order from player 0 to player n - 1. The competition process is as follows: The first two players in the queue play a game, and the player with the higher skill level wins. After the game, the winner stays at the beginning of the queue, and the loser goes to the end of it. The winner of the competition is the first player who wins k games in a row. Return the initial index of the winning player. Example 1: Input: skills = [4,2,6,3,9], k = 2 Output: 2 Explanation: Initially, the queue of players is [0,1,2,3,4]. The following process happens: Players 0 and 1 play a game, since the skill of player 0 is higher than that of player 1, player 0 wins. The resulting queue is [0,2,3,4,1]. Players 0 and 2 play a game, since the skill of player 2 is higher than that of player 0, player 2 wins. The resulting queue is [2,3,4,1,0]. Players 2 and 3 play a game, since the skill of player 2 is higher than that of player 3, player 2 wins. The resulting queue is [2,4,1,0,3]. Player 2 won k = 2 games in a row, so the winner is player 2. Example 2: Input: skills = [2,5,4], k = 3 Output: 1 Explanation: Initially, the queue of players is [0,1,2]. The following process happens: Players 0 and 1 play a game, since the skill of player 1 is higher than that of player 0, player 1 wins. The resulting queue is [1,2,0]. Players 1 and 2 play a game, since the skill of player 1 is higher than that of player 2, player 1 wins. The resulting queue is [1,0,2]. Players 1 and 0 play a game, since the skill of player 1 is higher than that of player 0, player 1 wins. The resulting queue is [1,2,0]. Player 1 won k = 3 games in a row, so the winner is player 1. Constraints: n == skills.length 2 <= n <= 105 1 <= k <= 109 1 <= skills[i] <= 106 All integers in skills are unique.

Explanation

Here's the breakdown of the solution:

• Simulate the game: Mimic the competition process by tracking the queue of players and the number of consecutive wins for the current winner.
• Handle large k: If k is larger than n - 1, the player with the highest skill will always win. Identify this player and return their index directly to avoid unnecessary simulations.

• Optimize for edge cases: Specifically handle the edge case where n is less than or equal to k since the largest element will not always win in this scenario, we still have to run the simulation.

• Runtime Complexity: O(n), Storage Complexity: O(1)

Code

    def find_the_winner(skills, k):
    n = len(skills)
    if k >= n - 1:
        winner_index = 0
        for i in range(1, n):
            if skills[i] > skills[winner_index]:
                winner_index = i
        return winner_index

    winner = 0
    wins = 0
    loser = 1

    while wins < k:
        if skills[winner] > skills[loser]:
            wins += 1
            temp = loser
            loser += 1
            if loser == n:
              loser = temp + 1
              if loser == n:
                loser = 0

        else:
            wins = 1
            temp_winner = loser
            winner = loser
            loser = winner + 1
            if loser == n:
              loser = 0

        if wins >= k:
          return winner
        if loser == winner:
          loser += 1
          if loser == n:
            loser = 0
    return winner