直接用集合
n=int(input())
male=set()
female=set()
for i in range(n):
p = input().split()
m = int(p[0])
f = int(p[1])
male |= set(p[2:m+2])
female |= set(p[m+2:])
res=sorted(map(int,(male-female)))
print(' '.join(map(str,res)))
你的代码这里反了: