Solve the programming task below in a Python markdown code block.
Professor Sahil is a master artist, he always finds creative ways to teach lessons to his students.
Today in Painting class he took all the students of the class to a wall. Professor Sahil asked every student to paint the wall upto a certain integral height one by one (second boy starts once the first boy finishes painting) from the bottom with any color of their wish, except a student Mudit who was made to stand behind the wall and note down all the data i.e the height upto which each student painted and the color $Ci$ every student used. At the end of the painting session Professor asked Mudit to tell how many distinct colors are there on the wall. Mudit being a weak student asked you for help.

Formally, given a wall of infinite height, initially unpainted. There occur $N$ operations, and in ith operation, the wall is painted upto height $Hi$ with color $Ci$. Suppose in jth operation (j>i) wall is painted upto height $Hj$ with color $Cj$ such that $Hj$ ≥ $Hi$, the $Cith$ color on the wall is hidden. At the end of $N$ operations, you have to find the number of distinct colors(≥1) visible on the wall.

Help him find out the number of distinct colors on the wall.

------ Input: ------

The first line consists of single integer $T$ denoting the number of test cases.
The second line contains 2 space separated integers $N$ and $M$, denoting the number of students and number of colors available (1 to $M$).
The third line contains $N$-space separated integers ($Hi$ ) denoting the height upto which each student painted the wall.
The fourth line contains $N$ space separated integers denoting the color ( $Ci$ ) the ith student used.

------ Output: ------
Print the number for distinct colors on the wall for each test case.

------ Constraints ------
$1 ≤ T ≤ 100$
$1 ≤ N ,M ≤ 10^{5}$
Sum of N over all test cases ≤ $5*10^{5}$
Sum of M over all test cases ≤$5*10^{5}$
$1 ≤ Hi ≤10^{9}$
$1 ≤ Ci ≤ M$

------ Sample Input: ------
	
------ Sample Output: ------
	
###EXPLANATION:

----- Sample Input 1 ------ 
3
5 4
1 2 3 4 5
3 3 3 3 3
5 4
3 5 1 2 3
1 2 3 4 3
5 5 
5 4 3 2 3
1 2 3 4 5
----- Sample Output 1 ------ 
1
2
3
----- explanation 1 ------ 
In the first test case, painted upto height 1, 2, 3, 4, 5 in the five operations, all with the same color. Hence, the number of distinct colors is 1.