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# Problem Challenge 1: Next Interval (hard)

## Problem Statement

Given an array of intervals, find the next interval of each interval. In a list of intervals, for an interval ‘i’ its next interval ‘j’ will have the smallest ‘start’ greater than or equal to the ‘end’ of ‘i’.

Write a function to return an array containing indices of the next interval of each input interval. If there is no next interval of a given interval, return -1. It is given that none of the intervals have the same start point.

**Example 1**:

```
Input: Intervals [[2,3], [3,4], [5,6]]
Output: [1, 2, -1]
```

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