LeetCode – Range Sum Query – Mutable (Java)

Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies nums by updating the element at index i to val. Java Solution 1 – Segment Tree class TreeNode{ int start; int end; int sum; TreeNode leftChild; TreeNode rightChild;   public … Read more