题解 | 圣
圣
https://www.nowcoder.com/practice/36bea3ca457c4ce2bbb3b2059679f286
from functools import reduce
for _ in range(int(input())):
a=0
n=int(input())
b=list(map(int,input().split()))
print(reduce(lambda x, y: x ^ y, b, 0))
圣
https://www.nowcoder.com/practice/36bea3ca457c4ce2bbb3b2059679f286
from functools import reduce
for _ in range(int(input())):
a=0
n=int(input())
b=list(map(int,input().split()))
print(reduce(lambda x, y: x ^ y, b, 0))
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