**Physical Address**

304 North Cardinal St.

Dorchester Center, MA 02124

For the upcoming semester, the admins of your university decided to keep a total of *X* seats for the `MATH-1`

course. A student interest survey was conducted by the admins and it was found that *Y* students were interested in taking up the `MATH-1`

course.

Find the **minimum** number of **extra** seats that the admins need to add into the `MATH-1`

course to make sure that every student who is interested in taking the course would be able to do so.

- The first line of input will contain a single integer
*T*, denoting the number of test cases. - Each test case consists of two-space separated integers on a single line,
*X*and*Y*— the current number of seats up for enrolment and the number of students interested in taking up the course in the upcoming semester, respectively.

For each test case, output on a new line the **minimum** number of seats required to be added.

- 1 \leq T \leq 1001≤
*T*≤100 - 1 \leq X, Y \leq 10^51≤
*X*,*Y*≤105

```
Input: 4
1 1
12 34
50 49
49 50
Output: 0
22
0
1
```

**Test case 1:** Exactly 1 seat is available for enrolment, and exactly 1 student is interested in taking up the course, hence addition of more seats is not required.

**Test case 2:** 12 seats are available for enrolment but 34 students are interested in taking up the course, hence the admins would have to add 34−12=22 more seats to make sure that every student interested in the course gets a seat.

**Test case 3:** 50 seats are available for enrolment and 49 students are interested in taking up the course, hence addition of more seats is not required.

**Test case 4:** 49 seats are available for enrolment, but 50 students are interested in taking up the course, hence the admins would have to add 50−49=1 more seat to make sure that every student interested in the course gets a seat.

```
#include <iostream>
using namespace std;
int main() {
int t;
cin>>t;
while(t--)
{
int x,y;
cin>>x>>y;
if(x>=y)
cout<<0<<endl;
else
cout<<y-x<<endl;
}
return 0;
}
```

```
import java.util.*;
import java.lang.*;
import java.io.*;
class Codechef
{
public static void main (String[] args) throws java.lang.Exception
{
Scanner sc = new Scanner(System.in);
int a = sc.nextInt();
while(a-->0){
int x = sc.nextInt();
int y = sc.nextInt();
if(x >y){
System.out.println("0");
}
else{
System.out.println(y-x);
}
}
}
}
```

```
x = int(input())
for i in range(x):
a,b = map(int,input().split())
if(a > b):
print("0")
else:
print(b-a)
```

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