题目描述
You are given an array $a$ consisting of $n$ positive integers.
You are allowed to perform this operation any number of times (possibly, zero):
- choose an index $i$ ($2 \le i \le n$), and change $a_i$ to $a_i - a_{i-1}$.
Is it possible to make $a_i=0$ for all $2\le i\le n$?
Input
The input consists of multiple test cases. The first line contains a single integer $t$ ($1\le t\le 100$) — the number of test cases. The description of the test cases follows.
The first line contains one integer $n$ ($2 \le n \le 100$) — the length of array $a$.
The second line contains $n$ integers $a_1,a_2,\ldots,a_n$ ($1 \le a_i \le 10^9$).
Output
For each test case, print "YES" (without quotes), if it is possible to change $a_i$ to $0$ for all $2 \le i \le n$, and "NO" (without quotes) otherwise.
You can print letters in any case (upper or lower).
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分
样例输入
样例输出
提示
In the first test case, the initial array is $[5,10]$. You can perform $2$ operations to reach the goal:
- Choose $i=2$, and the array becomes $[5,5]$.
- Choose $i=2$, and the array becomes $[5,0]$.
In the second test case, the initial array is $[1,2,3]$. You can perform $4$ operations to reach the goal:
- Choose $i=3$, and the array becomes $[1,2,1]$.
- Choose $i=2$, and the array becomes $[1,1,1]$.
- Choose $i=3$, and the array becomes $[1,1,0]$.
- Choose $i=2$, and the array becomes $[1,0,0]$.
In the third test case, you can choose indices in the order $4$, $3$, $2$.