[BOJ] 10828. ์คํ(python)
๐๋ฌธ์ 
๐ช์์ด๋์ด
- ๋ช
๋ น์ด ์ฒ๋ฆฌ- push ๋ช ๋ น์ด ๋ค์ ์ซ์๋ฅผ ์คํ์ ๋ฃ์ด์ค๋ค
- size ์คํ๊ธธ์ด ์ถ๋ ฅ
- stack ๋น ๊ณต๊ฐ์ธ์ง ๊ฒ์ฌ - ย - stack O - stack X - empty - 0์ถ๋ ฅ - 1์ถ๋ ฅ - pop - stack.pop์ถ๋ ฅ - -1์ถ๋ ฅ - top - stack[-1]์ถ๋ ฅ - -1์ถ๋ ฅ 
 
๐ฅ์ฝ๋
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import sys
input=sys.stdin.readline
stack=[]
N = int(input())
for _ in range(N):
    command = input().split()
    if command[0]=='push': 
        stack.append(int(command[1]))
    elif command[0]=='size': 
        print(len(stack))
    else:
        if stack:
            if command[0] == 'pop': print(stack.pop())
            elif command[0] == 'empty': print(0)
            else: print(stack[-1])
        else:
            if command[0] == 'empty': print(1)
            else: print(-1)
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