Codechef•Jul 17, 2025

Donation Drive

Hazrat Ali

Codechef

The drive has collected X donations so far. Find the remaining number of donations needed to reach the target.

Input Format

  • The first line of input will contain a single integer T, denoting the number of test cases.
  • Each test case contains two space-separated integers N and X — the number of required donations and the number of collected donations, respectively.

Output Format

For each test case, output on a new line, the remaining number of donations needed to reach the target.

Constraints

  • 1≤T≤200
  • 1≤X≤N≤20

Sample 1:

Input 
4
5 2
3 3
5 4
7 5

Output
 
3
0
1
2

Solution

m = int(input())
for _ in range(m):
    n, x = map(int, input().split())
    print(n - x)


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