MAYMIN 개발 스토리

n = int(input()) cnt=0 stack=list() result=list() flag = True for i in range(n): number = int(input()) while cnt

k = int(input()) stack = list() for _ in range(k): num = int(input()) if num != 0: stack.append(num) else: stack.pop() print(sum(stack))

import sys n = int(sys.stdin.readline()) stack = list() for i in range(n): op = sys.stdin.readline().split() if op[0]=='push': stack.append(op[1]) elif op[0]=='pop': if len(stack)==0: print(-1) else: print(stack.pop()) elif op[0]=='size': print(len(stack)) elif op[0]=='empty': if len(stack)==0: print(1) else: print(0) elif op[0]=='top': if len(stack)==0: print(-1) else: print(stack[-1])