题解 | 不重复数字
不重复数字
https://www.nowcoder.com/practice/38532b5539164242b4252352be8749ab
t = int(input())
for _ in range(t):
n = int(input())
a = list(map(int,input().split()))
seen, ans = set(), []
for c in a:
if c not in seen:
seen.add(c)
ans.append(c)
print(' '.join(map(str,ans)))
