Summed Matrix
##### Submissions: 1449   Accuracy: 28.48%   Difficulty: Easy   Marks: 2

A matrix is constructed of size n*n. such that Mi,j= i+j.Count the number of cells having value q.
Assume, 1 based indexing.

Input:
The first line contains an integer, the number of tescases.Then each test case contains an integer n- size of the matrix , q- whose count you need to tell.

Output:
For every testcase, Output the count of q.

Constraints:
1 <= T <= 100
1 <= n <= 1015
2 <= q <= 2*n

Example:
Input:

2
4 7
5 4

Output:
6
3

Explanation:
1st testcase- Matrix becomes
2 3 4 5
3 4 5 6
4 5 6 7
5 6 7 8
The count of 7 is 2
2nd testcase-Matrix becomes
2 3 4 5 6
3 4 5 6 7
4 5 6 7 8
5 6 7 8 9
6 7 8 9 10
The count of 4 is 3

#### ** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Abhinav Jain(iamabjain)
Author: iamabjain

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