LeetCode682

水题

import numpy as np

def calPoints(ops):
    """
    :type ops: List[str]
    :rtype: int
    """
    nums = []
    for op in ops:
        if op == '+':   nums.append(nums[-1] + nums[-2])
        elif op == 'D': nums.append(nums[-1] * 2)
        elif op == 'C': nums.pop()
        else:   nums.append(int(op))
    return sum(nums)

# sample:
ops = ["5","2","C","D","+"]
print(calPoints(ops))
ops = ["5","-2","4","C","D","9","+","+"]
print(calPoints(ops))