The Simple Implementation of Binary Index Tree (BIT or Fenwick Tree)
Introduction to Binary Index Tree or Fenwick Tree Binary Index Tree (BIT) aka Fenwick Tree is a simple data structure that has O(LogN) complexity in updating element in a …
Tag: range sum
How to Compute Running Sum of 1d Array using std::partial_sum in C++?
Given an array nums. We define a running sum of an array as runningSum = sum(nums…nums). Return the running sum of nums. Example 1: Input: nums = Output: Explanation: …
C++ Range Sum Query on Immutable Array via Prefix Sum
Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example: Given nums = sumRange(0, 2): 1 sumRange(2, 5): …
