LeetCode 3356: Zero Array Transformation II Solution

Master LeetCode problem 3356 (Zero Array Transformation II), 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.

3356. Zero Array Transformation II

Medium

Array Binary Search Prefix Sum

Problem Explanation

Explanation:

To solve this problem, we need to simulate the process of decrementing values in the nums array based on the given queries. We will iterate over the queries and update the array accordingly. At each step, we need to check if the array has become a Zero Array. If it becomes a Zero Array after processing the first k queries, we return k. Otherwise, we return -1.

Initialize a variable k to keep track of the number of queries processed.
For each query in the queries array:
- Decrement values in the range [li, ri] by at most vali.
- Check if the array becomes a Zero Array after this query. If yes, return the current value of k.
- Increment k.
If no Zero Array is found after processing all queries, return -1.

Time Complexity: O(n + q) where n is the length of the nums array and q is the number of queries. Space Complexity: O(1)

Solution Code

class Solution {
    public int minOperations(int[] nums, int[][] queries) {
        int n = nums.length;
        int k = 0;
        
        for (int[] query : queries) {
            int l = query[0];
            int r = query[1];
            int val = query[2];
            
            for (int i = l; i <= r; i++) {
                nums[i] -= Math.min(val, nums[i]);
            }
            
            boolean isZeroArray = true;
            for (int num : nums) {
                if (num != 0) {
                    isZeroArray = false;
                    break;
                }
            }
            
            if (isZeroArray) {
                return k + 1;
            }
            
            k++;
        }
        
        return -1;
    }
}

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