codeforces#P1478C. Nezzar and Symmetric Array
Nezzar and Symmetric Array
Description
Long time ago there was a symmetric array $a_1,a_2,\ldots,a_{2n}$ consisting of $2n$ distinct integers. Array $a_1,a_2,\ldots,a_{2n}$ is called symmetric if for each integer $1 \le i \le 2n$, there exists an integer $1 \le j \le 2n$ such that $a_i = -a_j$.
For each integer $1 \le i \le 2n$, Nezzar wrote down an integer $d_i$ equal to the sum of absolute differences from $a_i$ to all integers in $a$, i. e. $d_i = \sum_{j = 1}^{2n} {|a_i - a_j|}$.
Now a million years has passed and Nezzar can barely remember the array $d$ and totally forget $a$. Nezzar wonders if there exists any symmetric array $a$ consisting of $2n$ distinct integers that generates the array $d$.
The first line contains a single integer $t$ ($1 \le t \le 10^5$) — the number of test cases.
The first line of each test case contains a single integer $n$ ($1 \le n \le 10^5$).
The second line of each test case contains $2n$ integers $d_1, d_2, \ldots, d_{2n}$ ($0 \le d_i \le 10^{12}$).
It is guaranteed that the sum of $n$ over all test cases does not exceed $10^5$.
For each test case, print "YES" in a single line if there exists a possible array $a$. Otherwise, print "NO".
You can print letters in any case (upper or lower).
Input
The first line contains a single integer $t$ ($1 \le t \le 10^5$) — the number of test cases.
The first line of each test case contains a single integer $n$ ($1 \le n \le 10^5$).
The second line of each test case contains $2n$ integers $d_1, d_2, \ldots, d_{2n}$ ($0 \le d_i \le 10^{12}$).
It is guaranteed that the sum of $n$ over all test cases does not exceed $10^5$.
Output
For each test case, print "YES" in a single line if there exists a possible array $a$. Otherwise, print "NO".
You can print letters in any case (upper or lower).
Samples
6
2
8 12 8 12
2
7 7 9 11
2
7 11 7 11
1
1 1
4
40 56 48 40 80 56 80 48
6
240 154 210 162 174 154 186 240 174 186 162 210
YES
NO
NO
NO
NO
YES
Note
In the first test case, $a=[1,-3,-1,3]$ is one possible symmetric array that generates the array $d=[8,12,8,12]$.
In the second test case, it can be shown that there is no symmetric array consisting of distinct integers that can generate array $d$.