LeetCode 1194: Tournament Winners Solution

Master LeetCode problem 1194 (Tournament Winners), a hard 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.

1194. Tournament Winners

Hard

Database

Problem Explanation

Explanation

To solve this problem, we need to determine the winner of a tournament where the matches are represented as a list of results. Each match consists of two teams competing against each other, and the winner advances to the next round. The input is a list of match results in the form of [winner, loser]. The task is to find the winner of the tournament.

We can use a stack to keep track of the current winners in each round. We iterate through the matches, pushing the winner onto the stack. If there are two winners on the stack, we pair them up and determine the winner of that round. We continue this process until we have a single winner left on the stack.

Solution Code

import java.util.*;

class Solution {
    public String tournamentWinner(List<List<String>> competitions, List<Integer> results) {
        Map<String, Integer> scores = new HashMap<>();
        String currentBestTeam = "";
        int maxScore = 0;

        for (int i = 0; i < competitions.size(); i++) {
            List<String> match = competitions.get(i);
            String winner = results.get(i) == 1 ? match.get(0) : match.get(1);

            scores.put(winner, scores.getOrDefault(winner, 0) + 3);

            if (scores.get(winner) > maxScore) {
                maxScore = scores.get(winner);
                currentBestTeam = winner;
            }
        }

        return currentBestTeam;
    }
}

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