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+<h2><a href="https://leetcode.com/problems/range-addition">370. Range Addition</a></h2><h3>Medium</h3><hr><p>You are given an integer <code>length</code> and an array <code>updates</code> where <code>updates[i] = [startIdx<sub>i</sub>, endIdx<sub>i</sub>, inc<sub>i</sub>]</code>.</p>
+
+<p>You have an array <code>arr</code> of length <code>length</code> with all zeros, and you have some operation to apply on <code>arr</code>. In the <code>i<sup>th</sup></code> operation, you should increment all the elements <code>arr[startIdx<sub>i</sub>], arr[startIdx<sub>i</sub> + 1], ..., arr[endIdx<sub>i</sub>]</code> by <code>inc<sub>i</sub></code>.</p>
+
+<p>Return <code>arr</code> <em>after applying all the</em> <code>updates</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2021/03/27/rangeadd-grid.jpg" style="width: 413px; height: 573px;" />
+<pre>
+<strong>Input:</strong> length = 5, updates = [[1,3,2],[2,4,3],[0,2,-2]]
+<strong>Output:</strong> [-2,0,3,5,3]
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> length = 10, updates = [[2,4,6],[5,6,8],[1,9,-4]]
+<strong>Output:</strong> [0,-4,2,2,2,4,4,-4,-4,-4]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= length &lt;= 10<sup>5</sup></code></li>
+	<li><code>0 &lt;= updates.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>0 &lt;= startIdx<sub>i</sub> &lt;= endIdx<sub>i</sub> &lt; length</code></li>
+	<li><code>-1000 &lt;= inc<sub>i</sub> &lt;= 1000</code></li>
+</ul>