682. Baseball Game

https://leetcode.com/problems/baseball-game/

Python

class Solution:
    def calPoints(self, ops: List[str]) -> int:
        scores = []
        for op in ops:
            if op == 'C':
                scores.pop()
            elif op == 'D':
                scores.append(scores[-1]*2)
            elif op == '+':
                scores.append(scores[-1]+scores[-2])
            else:
                scores.append(int(op))

        return sum(scores)