#### Cycle in an Array

You are given an array of non-negative integers as an argument. Each integer element points to the index of the next element. Return true if there is a cycle in the array, false if not.

A cycle would be found if the value of the array loops back to an element that it is already seen.

### Requirements

- Must return either true or false

#### Example #1

```
solve([1, 2, 1, 3])
> true
```

*The value of the array is at the zero index. The element's value here is 1, so we go to the 1 index next.**The value of the array is at the 1 index. The element's value here is 2, so we go to the 2 index next.**The value of the array is at the 2 index. The element's value here is 1, so we go back to the 1 index next.**We have already seen the 1 index before, so we have found a cycle and the program returns true.*

#### Example #2

```
solve([1, 2, 3, 4, 5, 6])
> false
```

*We do not revisit any indexes in the array, so we return false.*