from sys import stdin, stdout
for _ in range(int(stdin.readline())):
N = int(stdin.readline())
A = list(map(int, stdin.readline().split()))
print(min(A))1370A - Maximum GCD | 149A - Business trip |
34A - Reconnaissance 2 | 59A - Word |
462B - Appleman and Card Game | 1560C - Infinity Table |
1605C - Dominant Character | 1399A - Remove Smallest |
208A - Dubstep | 1581A - CQXYM Count Permutations |
337A - Puzzles | 495A - Digital Counter |
796A - Buying A House | 67A - Partial Teacher |
116A - Tram | 1472B - Fair Division |
1281C - Cut and Paste | 141A - Amusing Joke |
112A - Petya and Strings | 677A - Vanya and Fence |
1621A - Stable Arrangement of Rooks | 472A - Design Tutorial Learn from Math |
1368A - C+= | 450A - Jzzhu and Children |
546A - Soldier and Bananas | 32B - Borze |
1651B - Prove Him Wrong | 381A - Sereja and Dima |
41A - Translation | 1559A - Mocha and Math |