149. Last Stone Weight

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Example 1:

Input: stones = [2, 7, 4, 1, 8, 1]

Output: 1

Explanation: We combine 7 and 8 to get 1 so the array converts to [2,4,1,1,1] then, we combine 2 and 4 to get 2 so the array converts to [2,1,1,1] then, we combine 2 and 1 to get 1 so the array converts to [1,1,1] then, we combine 1 and 1 to get 0 so the array converts to [1] then that's the value of the last stone.

Example 2:

Input: stones = [1]

Output: 1

Explanation: Only one stone, so the last stone weight is 1.

Constraints:

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Time Complexity

O(n log n)

Space Complexity

O(n)