# Empty slot in list of integers

## Question

You have a list of integers that range from values `1`

to `n`

. Each value in the list is unique, however one random slot in the list is empty, making the size of the input array `n-1`

. Can you write a function to find the missing integer?

Examples:

```
Input: arr[] = [1, 2, 4, 6, 3, 7, 8]
Output: 5
Input: arr[] = [1, 3, 2, 5, 6]
Output: 4
```