LeetCode 3182: Find Top Scoring Students Solution

Master LeetCode problem 3182 (Find Top Scoring Students), 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.

3182. Find Top Scoring Students

Medium

Database

Problem Explanation

Explanation:

To find the top scoring students, we can follow these steps:

Create a map to store the scores of each student.
Iterate through the list of scores and update the scores in the map.
Sort the map by values in descending order.
Return the top scoring students based on the sorted map.

Time Complexity:

The time complexity of this approach is O(n log n), where n is the number of students.

Space Complexity:

The space complexity is O(n) to store the scores in the map.

Solution Code

import java.util.*;

class Solution {
    public List<Integer> findTopScoringStudents(int[] scores, int k) {
        Map<Integer, Integer> scoreMap = new HashMap<>();
        
        for (int score : scores) {
            scoreMap.put(score, scoreMap.getOrDefault(score, 0) + 1);
        }
        
        List<Integer> topStudents = new ArrayList<>();
        
        scoreMap.entrySet()
                .stream()
                .sorted(Map.Entry.<Integer, Integer>comparingByValue().reversed())
                .limit(k)
                .forEach(entry -> topStudents.add(entry.getKey()));
        
        return topStudents;
    }
}

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