[Solution] Chairs Requirement CodeChef Solution | CodeChef Problem Solution 2022

[Solution] Chairs Requirement CodeChef Solution | CodeChef Problem Solution 2022

Chef's coding class is very famous in Chefland.

This year X$X$ students joined his class and each student will require one chair to sit on. Chef already has Y$Y$ chairs in his class. Determine the minimum number of new chairs Chef must buy so that every student is able to get one chair to sit on.

Input Format

• The first line contains a single integer T$T$ — the number of test cases. Then the test cases 

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• The first and only line of each test case contains two integers X$X$ and Y$Y$ — the number of students in the class and the number of chairs Chef already has.

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Output Format

For each test case, output the minimum number of extra chairs Chef must buy so that every student gets one chair.

Constraints

• 1≤T≤1000$1\le T\le 1000$
• 0≤X,Y≤100