# Finding repeated elements in array of integers

## Question

Suppose you're given an array of integers. Write code to find the first repeating element in the array.

For example:

```
Input: array = [10, 2, -2, -20, 10]
Output: 10
Input: array = [9, 4, 20, 20, 10, 5]
Output: 20
```

If there are no duplicates, you can return -1.