Tales of a Sort
Description
Alphen has an array of positive integers $a$ of length $n$.
Alphen can perform the following operation:
- For all $i$ from $1$ to $n$, replace $a_i$ with $\max(0, a_i - 1)$.
Alphen will perform the above operation until $a$ is sorted, that is $a$ satisfies $a_1 \leq a_2 \leq \ldots \leq a_n$. How many operations will Alphen perform? Under the constraints of the problem, it can be proven that Alphen will perform a finite number of operations.
Each test contains multiple test cases. The first line of input contains a single integer $t$ ($1 \le t \le 500$) — the number of test cases. The description of the test cases follows.
The first line of each test case contains a single integer $n$ ($2 \le n \le 50$) — the length of the array $a$.
The second line of each test case contains $n$ integers $a_1, a_2, \dots, a_n$ ($1 \le a_i \le 10 ^ 9$) — the elements of the array $a$.
For each test case, output a single integer — the number of operations that Alphen will perform.
Input
Each test contains multiple test cases. The first line of input contains a single integer $t$ ($1 \le t \le 500$) — the number of test cases. The description of the test cases follows.
The first line of each test case contains a single integer $n$ ($2 \le n \le 50$) — the length of the array $a$.
The second line of each test case contains $n$ integers $a_1, a_2, \dots, a_n$ ($1 \le a_i \le 10 ^ 9$) — the elements of the array $a$.
Output
For each test case, output a single integer — the number of operations that Alphen will perform.
7
3
1 2 3
5
2 1 2 1 2
4
3 1 5 4
2
7 7
5
4 1 3 2 5
5
2 3 1 4 5
3
1000000000 1 2
0
2
5
0
4
3
1000000000
Note
In the first test case, we have $a=[1,2,3]$. Since $a$ is already sorted, Alphen will not need to perform any operations. So, the answer is $0$.
In the second test case, we have $a=[2,1,2,1,2]$. Since $a$ is not initially sorted, Alphen will perform one operation to make $a=[1,0,1,0,1]$. After performing one operation, $a$ is still not sorted, so Alphen will perform another operation to make $a=[0,0,0,0,0]$. Since $a$ is sorted, Alphen will not perform any other operations. Since Alphen has performed two operations in total, the answer is $2$.