[python] 백준 1547 공

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

5613번: 계산기 프로그램

N=int(input())
ball = []
now=1
for i in range(N):
    inp= list((map(int,input().split())))
    inp.sort()
    ball.append(inp)
for i in ball:
    if i[0] ==now:
        now=i[1]
    elif i[1]==now:
        now=i[0]
print(now)