[백준] 10828 스택 (파이썬 python)

 

 

문제 링크

 

 

https://www.acmicpc.net/problem/10828

10828번: 스택

 

 

 

문제

 

 

 

 

문제 풀이

 

 

import sys
input = sys.stdin.readline

stack = []

n = int(input())
for i in range(n):
    command = input().split()
    if command[0] == 'push':
        stack.append(command[1])
    elif command[0] == 'pop':
        if len(stack) == 0:
            print(-1)
        else:
            print(stack.pop())
    elif command[0] == 'size':
        print(len(stack))
    elif command[0] == 'empty':
        if len(stack) == 0:
            print(1)
        else:
            print(0)
    elif command[0] == 'top':
        if len(stack) == 0:
            print(-1)
        else:
            print(stack[-1])