Leetcode Problem 1658. Minimum Operations to Reduce X to Zero

1658. Minimum Operations to Reduce X to Zero

Leetcode Solutions

Two Pointers Approach to Find Minimum Operations

  1. Calculate the sum of all elements in nums and store it in total.
  2. Initialize two pointers, left and right, to 0.
  3. Initialize current to 0, which will track the sum of the current subarray.
  4. Initialize max_length to -1, which will track the maximum length of the subarray that sums to total - x.
  5. Iterate with the right pointer over the array, adding nums[right] to current.
  6. While current is greater than total - x, subtract nums[left] from current and increment left.
  7. If current equals total - x, update max_length with the maximum of max_length and right - left + 1.
  8. After the loop, if max_length is not -1, return the length of nums minus max_length as the minimum number of operations; otherwise, return -1.
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Prefix and Suffix Sum Approach

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