LeetCode 3038: Maximum Number of Operations With the Same Score I Solution

Master LeetCode problem 3038 (Maximum Number of Operations With the Same Score I), 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.

3038. Maximum Number of Operations With the Same Score I

Easy

Array Simulation

Problem Explanation

Explanation

To solve this problem, we can iterate through the array of integers nums and count the frequency of each unique sum of pairs of elements. The maximum number of operations will be the maximum frequency of any sum. We can achieve this by using a hashmap to store the frequency of each sum.

Initialize a hashmap to store the frequency of each sum.
Iterate through the array nums and compute the sum of each pair of elements.
Increment the frequency of the sum in the hashmap.
Find the maximum frequency in the hashmap.
Return the maximum frequency as the result.

Time complexity: O(n), where n is the number of elements in the input array nums. Space complexity: O(n), to store the frequencies of sums.

Solution Code

class Solution {
    public int maxOperations(int[] nums) {
        Map<Integer, Integer> freqMap = new HashMap<>();
        int maxOps = 0;
        
        for (int num : nums) {
            int complement = 5 - num; // Target sum is 5
            if (freqMap.getOrDefault(complement, 0) > 0) {
                freqMap.put(complement, freqMap.get(complement) - 1);
                maxOps++;
            } else {
                freqMap.put(num, freqMap.getOrDefault(num, 0) + 1);
            }
        }
        
        return maxOps;
    }
}

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