# 0370. Range Addition

<https://leetcode.com/problems/range-addition>

## Description

You are given an integer `length` and an array `updates` where `updates[i] = [startIdxi, endIdxi, inci]`.

You have an array `arr` of length `length` with all zeros, and you have some operation to apply on `arr`. In the `ith` operation, you should increment all the elements `arr[startIdxi], arr[startIdxi + 1], ..., arr[endIdxi]` by `inci`.

Return `arr` *after applying all the* `updates`.

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/03/27/rangeadd-grid.jpg)

```
**Input:** length = 5, updates = [[1,3,2],[2,4,3],[0,2,-2]]
**Output:** [-2,0,3,5,3]
```

**Example 2:**

```
**Input:** length = 10, updates = [[2,4,6],[5,6,8],[1,9,-4]]
**Output:** [0,-4,2,2,2,4,4,-4,-4,-4]
```

**Constraints:**

* `1 <= length <= 105`
* `0 <= updates.length <= 104`
* `0 <= startIdxi <= endIdxi < length`
* `-1000 <= inci <= 1000`

## ac

```java
```