Rebellion
Description
You have an array $a$ of size $n$ consisting only of zeroes and ones. You can do the following operation:
- choose two indices $1 \le i , j \le n$, $i \ne j$,
- add $a_{i}$ to $a_{j}$,
- remove $a_{i}$ from $a$.
Note that elements of $a$ can become bigger than $1$ after performing some operations. Also note that $n$ becomes $1$ less after the operation.
What is the minimum number of operations needed to make $a$ non-decreasing, i. e. that each element is not less than the previous element?
Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 10^4$). The description of the test cases follows.
The first line of each test case contains an integer $n$ ($1 \le n \le 10^5$), the size of array $a$.
Next line contains $n$ integers $a_{1}, a_{2}, \ldots a_{n}$ ($a_i$ is $0$ or $1$), elements of array $a$.
It's guaranteed that sum of $n$ over all test cases doesn't exceed $2 \cdot 10^5$.
For each test case print a single integer, minimum number of operations needed to make $a$ non-decreasing.
Input
Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 10^4$). The description of the test cases follows.
The first line of each test case contains an integer $n$ ($1 \le n \le 10^5$), the size of array $a$.
Next line contains $n$ integers $a_{1}, a_{2}, \ldots a_{n}$ ($a_i$ is $0$ or $1$), elements of array $a$.
It's guaranteed that sum of $n$ over all test cases doesn't exceed $2 \cdot 10^5$.
Output
For each test case print a single integer, minimum number of operations needed to make $a$ non-decreasing.
4
8
0 0 1 1 1 1 1 1
5
1 0 0 1 1
2
1 0
11
1 1 0 0 1 0 0 1 1 1 0
0
1
1
3
Note
In the first test case, $a$ is already non-decreasing, so you don't need to do any operations and the answer is $0$.
In the second test case, you can perform an operation for $i = 1$ and $j = 5$, so $a$ will be equal to $[0, 0, 1, 2]$ and it becomes non-decreasing.
In the third test case, you can perform an operation for $i = 2$ and $j = 1$, so $a$ will be equal to $[1]$ and it becomes non-decreasing.