Problem Description

Given $n$ numbers, remove the duplicates and keep only the first occurrence of each number.

Input Format

This problem contains multiple test cases.

The first line contains an integer $T$, the number of test cases.

For each test case:

The first line contains an integer $n$.

The second line contains $n$ numbers, which are the given numbers.

Output Format

For each test case, output one line containing the remaining numbers after deduplication, separated by a single space.

2
11
1 2 18 3 3 19 2 3 6 5 4
6
1 2 3 4 5 6

1 2 18 3 19 6 5 4
1 2 3 4 5 6

Hint

For $30\%$ of the testdata, $n \le 100$, and each given number $\in [0, 100]$.

For $60\%$ of the testdata, $n \le 10^4$, and each given number $\in [0, 10^4]$.

For $100\%$ of the testdata, $1 \le T \le 50$, $1 \le n \le 5 \times 10^4$, and each given number is within the $32$-bit signed integer range.

Translated by ChatGPT 5