Find Pair Given Difference
Easy Accuracy: 47.62% Submissions: 12139 Points: 2

Given an unsorted array Arr[] and a number N. You need to write a program to find if there exists a pair of elements in the array whose difference is N.

Input:
First line of input contains an integer T which denotes the number of test cases. Then T test cases follows. First line of each test case contains two space separated integers L and N where L denotes the length of array or the number of elements in the array and N denotes the difference between two elements. Second line of each test case contains L space separated integers which denotes the elements of the array.

Output:
For each test case, in a new line print 1 if the pair is found otherwise print -1 if there does not exist any such pair.

Constraints:
1<=T<=100
1<=L<=104
1<=Arr[i]<=105

Example:
Input:

2
6 78
5 20 3 2 5 80
5 45
90 70 20 80 50
Output:
1
-1

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