P7717 [CF1420A] Cubes Sorting
入门
题目描述

Wheatley decided to try to make a test chamber. He made a nice test chamber, but there was only one detail absent — cubes.

For completing the chamber Wheatley needs $n$ cubes. $i$-th cube has a volume $a_i$.

Wheatley has to place cubes in such a way that they would be sorted in a non-decreasing order by their volume. Formally, for each $i>1$, $a_{i-1} \le a_i$ must hold.

To achieve his goal, Wheatley can exchange two neighbouring cubes. It means that for any $i>1$ you can exchange cubes on positions $i-1$ and $i$.

But there is a problem: Wheatley is very impatient. If Wheatley needs more than $\frac{n \cdot (n-1)}{2}-1$ exchange operations, he won't do this boring work.

Wheatly wants to know: can cubes be sorted under this conditions?

Input

Each test contains multiple test cases.

The first line contains one positive integer $t$ ($1 \le t \le 1000$), denoting the number of test cases. Description of the test cases follows.

The first line of each test case contains one positive integer $n$ ($2 \le n \le 5 \cdot 10^4$) — number of cubes.

The second line contains $n$ positive integers $a_i$ ($1 \le a_i \le 10^9$) — volumes of cubes.

It is guaranteed that the sum of $n$ over all test cases does not exceed $10^5$.

Output

For each test case, print a word in a single line: "YES" (without quotation marks) if the cubes can be sorted and "NO" (without quotation marks) otherwise.

输入格式

见题面 Input 部分

输出格式

见题面 Output 部分

样例输入
3 5 5 3 2 1 4 6 2 2 2 2 2 2 2 2 1
样例输出
YES YES NO
提示

In the first test case it is possible to sort all the cubes in $7$ exchanges.

In the second test case the cubes are already sorted.

In the third test case we can make $0$ exchanges, but the cubes are not sorted yet, so the answer is "NO".