last stone weigth.py

class Solution:
    def lastStoneWeight(self, stones: List[int]) -> int:
        sorted_stones = list(sorted(stones))
        
        while True:
            if len(sorted_stones) > 1:
                x = sorted_stones[-2]
                y = sorted_stones[-1]

                del sorted_stones[-1]
                del sorted_stones[-1]

                if x != y:                    
                    delta = y - x
                    sorted_stones.append(delta)
                    sorted_stones = list(sorted(sorted_stones))
            elif len(sorted_stones) == 1:
                return sorted_stones[0]
            else:
                return 0