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m=int(input())
for t in range(m):
	n=int(input())
	a=list(map(int,input().split()))
	s=a[0]
	for i in range(n):
		s=s&a[i]
	print(s)

Success #stdin #stdout 0.02s 9296KB

stdin

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4
2
3 10
3
1 1 3
4
3 11 3 7
5
11 7 15 3 7

stdout

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https://ideone.com/gHcnsp

language:

Python 3 (python 3.9.5)

created:

visibility:

public

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