# PROBLEM LINK:

Practice

Contest: Division 1

Contest: Division 2

Contest: Division 3

Contest: Division 4

* Author:* tejas10p

*iceknight1093, rivalq*

**Testers:***iceknight1093*

**Editorialist:**# DIFFICULTY:

TBD

# PREREQUISITES:

None

# PROBLEM:

You earned X rupees this year; and anyone who earns strictly more than Y rupees per year must pay taxes.

Given that Y \lt X, how much money must you invest so that you no longer have to pay taxes?

# EXPLANATION:

Since Y \lt X, it’s clearly optimal to bring our money down to Y (since it only shouldn’t be strictly more than Y).

This can be done by investing X-Y rupees.

So, the answer is simply X-Y.

# TIME COMPLEXITY:

\mathcal{O}(N) per testcase.

# CODE:

## Code (Python)

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