Associated Course(s):
Sudo Placement 2019

Given an array containing **N** integers and an integer **K**. Your task is to find the length of the longest Sub-Array with sum of the elements equal to the given value **K**.

**Input:**

The first line of input contains an integer **T** denoting the number of test cases. Then **T** test cases follow. Each test case consists of two lines. First line of each test case contains two Integers **N** and **K** and the second line contains **N** space separated elements of the array.

**Output:**

For each test case, print the required lenght of the longest Sub-Array in new line. If no such sub array can be formed print 0.

**Constraints:**

1<=T<=500

1<=N,K<=10^{5}

-10^{5}<=A[i]<=10^{5}

**Example:
Input:**

3

6 15

10 5 2 7 1 9

6 -5

-5 8 -14 2 4 12

3 6

-1 2 3

4

5

0

TestCase 1:

```
Input : arr[] = { 10, 5, 2, 7, 1, 9 },
K = 15
Output : 4
The sub-array is
```**{5, 2, 7, 1}**.

Author: harshitsidhwa

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