# problem436

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Published: Mar 23, 2021 License: MIT

### 436. Find Right Interval (Medium)

You are given an array of `intervals`, where `intervals[i] = [starti, endi]` and each `starti` is unique.

The right interval for an interval `i` is an interval `j` such that `startj`` >= endi` and `startj` is minimized.

Return an array of right interval indices for each interval `i`. If no right interval exists for interval `i`, then put `-1` at index `i`.

Example 1:

```Input: intervals = [[1,2]]
Output: [-1]
Explanation: There is only one interval in the collection, so it outputs -1.
```

Example 2:

```Input: intervals = [[3,4],[2,3],[1,2]]
Output: [-1,0,1]
Explanation: There is no right interval for [3,4].
The right interval for [2,3] is [3,4] since start0 = 3 is the smallest start that is >= end1 = 3.
The right interval for [1,2] is [2,3] since start1 = 2 is the smallest start that is >= end2 = 2.
```

Example 3:

```Input: intervals = [[1,4],[2,3],[3,4]]
Output: [-1,2,-1]
Explanation: There is no right interval for [1,4] and [3,4].
The right interval for [2,3] is [3,4] since start2 = 3 is the smallest start that is >= end1 = 3.
```

Constraints:

• `1 <= intervals.length <= 2 * 104`
• `intervals[i].length == 2`
• `-106 <= starti <= endi <= 106`
• The start point of each interval is unique.

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