# PROBLEM LINK:

Practice

Contest: Division 1

Contest: Division 2

Contest: Division 3

Contest: Division 4

* Author:* notsoloud

*iceknight1093, satyam_343*

**Testers:***iceknight1093*

**Editorialist:**# DIFFICULTY:

273

# PREREQUISITES:

None

# PROBLEM:

Chef works from X pm to Y pm. How many hours does he work?

# EXPLANATION:

The number of hours between X pm and Y pm is Y - X. Thus, the answer is Y - X.

# TIME COMPLEXITY:

\mathcal{O}(1) per testcase.

# CODE:

## Code (Python)

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