Last Stone Weight Problem Explanation

Given a collection of stones, each having a positive integer weight, perform the following operation: On each turn, select the two heaviest stones and smash them together. Assume the stones have weights 'x' and 'y' where 'x' <= 'y'. The outcomes of smashes are:

1. If 'x' == 'y', both stones are destroyed.
2. If 'x' != 'y', the stone with weight 'x' is destroyed, and the stone with weight 'y' is updated to 'y - x'.

Continue this process until at most one stone remains. Return the weight of the last stone, or 0 if no stones are left.

Input:

First line: Integer 'N', the number of stones.
Second line: 'N' space-separated integers representing the weights of the stones.

Output:

Print the weight of the final stone, or 0 if no stones remain.

Example:

Input: 
 N = 6
 Weights = [2, 7, 4, 1, 8, 1]

Output: 
 1

Constraints:

• 1 <= N <= 10^5
• 1 <= W[i] <= 10^6
• Time Limit: 1 sec

Note:

Implement the function to solve the problem. No need for explicit printing or input reading as it's handled internally.