LeetCode 574: Winning Candidate Solution

Master LeetCode problem 574 (Winning Candidate), 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.

574. Winning Candidate

Medium

Database

Problem Explanation

Explanation:

To find the winning candidate in an election, we need to count the votes for each candidate and determine the candidate with the highest number of votes. If there is a tie, we need to return the candidate with the lowest ID.

Create a map to store the count of votes for each candidate.
Iterate through the votes array and update the count of votes for each candidate in the map.
Find the candidate with the highest number of votes and the lowest ID.
Return the ID of the winning candidate.

Time Complexity:

The time complexity of this solution is O(n) where n is the number of votes.

Space Complexity:

The space complexity is O(n) to store the count of votes for each candidate.

Solution Code

class Solution {
    public String findWinner(String[] votes) {
        Map<String, Integer> voteCount = new HashMap<>();
        
        String winner = "";
        int maxVotes = 0;
        
        for (String vote : votes) {
            voteCount.put(vote, voteCount.getOrDefault(vote, 0) + 1);
            if (voteCount.get(vote) > maxVotes || (voteCount.get(vote) == maxVotes && vote.compareTo(winner) < 0)) {
                maxVotes = voteCount.get(vote);
                winner = vote;
            }
        }
        
        return winner;
    }
}

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