백준 1547 [공] 파이썬

https://www.acmicpc.net/problem/1547

# 백준 1547 공

N=int(input())
dic_cup={1:True,2:False,3:False}
for _ in range(N):
    a_cup,b_cup=map(int,input().split())
    temp=dic_cup[a_cup]
    dic_cup[a_cup]=dic_cup[b_cup]
    dic_cup[b_cup]=temp


if dic_cup[1]==True:
    print(1)
elif dic_cup[2]==True:
    print(2)
elif dic_cup[3]==True:
    print(3)