Solve the programming task below in a Python markdown code block.
Chef has an array A of length N. Chef wants to select some disjoint, non-empty subarrays from A such that:
The mex of each of the selected subarray is the same. 

Note that the selected subarrays need not cover all the elements of the array.

For e.g. if A = [2, 0, 1, 6, 2, 1, 3, 0, 7], then one way in which Chef can select subarrays is as following: {[0, 1], [1, 3, 0]} (Here mex of both of them is 2).

Chef wants to select the maximum number of disjoint, non-empty subarrays that satisfy the above condition. Can you help him to do so?

Note: An array X is called a subarray of an array Y if X can be obtained from Y by deletion of several (possibly, zero or all) elements from the beginning and several (possibly, zero or all) elements from the end. Also, mex of a subarray is the smallest non-negative number that does not occur in that subarray.

------ Input Format ------ 

- The first line will contain T - the number of test cases. Then the test cases follow.
- The first line of each test case contains a single integer N - the length of the array A.
- The second line of each test case contains N space-separated integers - A_{1}, A_{2}, \dots, A_{N} denoting the array A.

------ Output Format ------ 

For each test case, output the maximum number of disjoint subarrays which Chef can select such that mex of each subarray is the same.

------ Constraints ------ 

$1 ≤ T ≤ 1000$
$1 ≤ N ≤ 10^{5}$
$0 ≤A_{i} ≤N$
- It is guaranteed that the sum of $N$ does not exceed $5 \cdot 10^{5}$

----- Sample Input 1 ------ 
2
4
0 1 1 0
6
0 0 3 1 2 0

----- Sample Output 1 ------ 
2
3

----- explanation 1 ------ 
Test case-1: Chef can select the following subarrays: $[0, 1]$, $[1, 0]$. Here $mex([0, 1]) = mex([1, 0]) = 2$. Therefore the answer is $2$.

Test case-2: Chef can select the following subarrays: $[0]$, $[0, 3]$, $[2, 0]$. Here $mex([0]) = mex([0, 3]) = mex([2, 0]) = 1$. Therefore the answer is $3$.