In Chefland, everyone who earns strictly more than Y rupees per year, has to pay a tax to Chef. Chef has allowed a special scheme where you can invest any amount of money and claim exemption for it. You have earned X ( �
� ) (X>Y) rupees this year. Find the minimum amount of money you have to invest so that you don't have to pay taxes this year.
The first line of input will contain a single integer T, denoting the number of test cases. Each test case consists of a single line of input consisting of two space separated integers X and Y denoting the amount you earned and the amount above which you will have to pay taxes.
For each test case, output a single integer, denoting the minimum amount you need to invest.
1<= T <=100 1<=Y<X<=100
4 2 2 8 7 1 5 1 4 2 1 1
Test case 1 1: The amount above which you will have to pay taxes is 2 2. Since you earn 4 4 rupees, you need to invest at least 2 2 rupees. After investing 2 2 rupees, you will remain with an effective income 4 − 2
2 4−2=2 rupees which will not be taxed.
Test case 2 2: The amount above which you will have to pay taxes is 7 7. Since you earn 8 8 rupees, you need to invest at least 1 1 rupees.
Test case 3 3: The amount above which you will have to pay taxes is 1
- Since you earn 5 5 rupees, you need to invest at least 4 4 rupees.
Test case 4 4: The amount above which you will have to pay taxes is 1
- Since you earn 2 2 rupees, you need to invest at least 1 1 rupees.