jae_coding

문제 문제 링크 코드 import sys input = sys.stdin.readline N = int(input()) stack = list() def push(stack, num): stack.append(num) def pop(stack): if len(stack) != 0: n = stack[len(stack)-1] print(n) del stack[-1] else: print(-1) def size(stack): print(len(stack)) def empty(stack): if len(stack) == 0: print(1) else: print(0) def top(stack): if len(stack) != 0: print(stack[len(stack)-1]) else: print(-1) f..