LeetCode 3355: Zero Array Transformation I Solution

Master LeetCode problem 3355 (Zero Array Transformation I), 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.

3355. Zero Array Transformation I

Medium

Array Prefix Sum

Problem Explanation

Explanation

To solve this problem, we need to determine if it is possible to transform the given array nums into a zero array by following the given queries. We can observe that if the sum of increments and decrements at each index is even, then the array will eventually become a zero array. If the sum is odd, then it won't be possible to obtain a zero array.

We can iterate through the queries and calculate the increments and decrements at each index. If the sum is odd at any index, we return false. If we complete all queries without encountering an odd sum, we return true.

Solution Code

class Solution {
    public boolean canTransform(int[] nums, int[][] queries) {
        int n = nums.length;
        int[] changes = new int[n + 1];
        
        for (int[] query : queries) {
            int li = query[0];
            int ri = query[1];
            changes[li]++;
            changes[ri + 1]--;
        }
        
        int sum = 0;
        for (int i = 0; i < n; i++) {
            sum += changes[i];
            if (nums[i] != 0 && sum % 2 != 0) {
                return false;
            }
        }
        
        return sum % 2 == 0;
    }
}

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