解题思路:
注意事项:
参考代码:
n=int(int(input()))
mas=[list(map(int,input().strip().split()))for i in range(n)]
mas_1=[j for i in mas for j in i]
l=[]
for i in range(min(mas_1),max(mas_1)+1):
l.append(i)
for i in mas_1:
if mas_1.count(i)==2:
s=i
break
mas_1=set(mas_1)
l=set(l)
a=l-mas_1
a=list(a)
print(a[0],s)
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