LeetCode 2897: Apply Operations on Array to Maximize Sum of Squares Solution

Master LeetCode problem 2897 (Apply Operations on Array to Maximize Sum of Squares), 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.

2897. Apply Operations on Array to Maximize Sum of Squares

Hard

Array Hash Table Greedy Bit Manipulation

Problem Explanation

Explanation:

This problem can be solved using a greedy approach. We need to maximize the sum of squares by choosing k elements from the array after performing a specified operation on the elements. The key idea is to realize that performing the given operation on any two elements results in one element being set to 0 and the other having all its bits set. Hence, the optimal strategy is to select k largest elements from the array after performing the operation. Solution:

Solution Code

class Solution {
    public int maxSumOfSquares(int[] nums, int k) {
        Arrays.sort(nums);
        int n = nums.length;
        long mod = 1000000007;
        long sum = 0;
        for (int i = n - 1; i >= n - k; i--) {
            sum = (sum + (long)nums[i] * nums[i]) % mod;
        }
        return (int)sum;
    }
}

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