[백준] 10773번: 제로 - Python

 

 

https://www.acmicpc.net/problem/10773

 

 

 

K = int(input())

stack = []

for i in range(K) :
    n = int(input())
    if n == 0 :
        stack.pop()
    else :
        stack.append(n)

print(sum(stack))