[백준 문제풀이] 얼렁뚱땅 11723번 집합 풀이

https://www.acmicpc.net/problem/11723

 

import sys
n = int(sys.stdin.readline())

a = set()

for i in range(n) :
	list_ = sys.stdin.readline().strip().split()
	if list_[0] == 'add' :
		a.add(int(list_[1]))
	elif list_[0] == 'remove' :
		if int(list_[1]) in a :
			a.remove(int(list_[1]))
	elif list_[0] == 'check' :
		if int(list_[1]) in a :
			print(1)
		else :
			print(0)
	elif list_[0] == 'toggle' :
		if int(list_[1]) in a :
			a.remove(int(list_[1]))
		else :
			a.add(int(list_[1]))
	elif list_[0] == 'all' :
		a = set([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20])
	else :
		a = set()