LeetCode 2985: Calculate Compressed Mean Solution

Master LeetCode problem 2985 (Calculate Compressed Mean), a easy 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.

2985. Calculate Compressed Mean

Easy

Database

Problem Explanation

Explanation:

To calculate the compressed mean of an array, we first need to compress the array by removing all duplicate elements. Then, we calculate the mean of the compressed array.

Algorithm:

Create a HashSet to store unique elements of the input array.
Iterate through the input array and add each element to the HashSet.
Calculate the sum of the unique elements in the HashSet.
Calculate the mean by dividing the sum by the size of the HashSet.

Time Complexity: O(n), where n is the number of elements in the input array. Space Complexity: O(n) for the HashSet.

Solution Code

import java.util.HashSet;

class Solution {
    public double calculateCompressedMean(int[] nums) {
        HashSet<Integer> uniqueNums = new HashSet<>();
        
        for (int num : nums) {
            uniqueNums.add(num);
        }
        
        double sum = 0;
        for (int num : uniqueNums) {
            sum += num;
        }
        
        return sum / uniqueNums.size();
    }
}

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