Minimum Operations to Reduce X to Zero

In one operation, remove either the first or the last remaining element of nums and subtract its value from x. Return the fewest operations needed to make x exactly zero. If no sequence of these removals works, return -1.

Example 1:

Input: nums = [2,5,1,3]
x = 5

Output: 2

Explanation: Remove 2 from the left and 3 from the right. Their sum is 5, so two operations suffice. Neither endpoint alone equals 5.

Example 2:

Input: nums = [2,3]
x = 5

Output: 2

Explanation: Remove both elements, whose sum is 2 + 3 = 5. This uses two operations and leaves an empty array.

Example 3:

Input: nums = [4,2,4]
x = 3

Output: -1

Explanation: The initial endpoints are both 4. Removing either would overshoot x = 3, so no valid sequence exists.

Constraints:

• 1 <= nums.length <= 100000
• 1 <= nums[i] <= 10000
• 1 <= x <= 1000000000