题解 | 不重复数字

import sys

T = int(sys.stdin.readline())
for _ in range(T):
    r, b, n, a = [], dict(), int(sys.stdin.readline()), list(map(int, sys.stdin.readline().split()))
    for i in a:
        if i not in b:
            b[i] = None
    r = list(b.keys())
    print(*r)