Fading Coder

Prefix Sum Fundamentals The prefix sum technique converts range sum queries from O(n) per query to O(1) by preprocessing the array once. Given an array of n integers and m queries asking for the sum of elements between indices l and r (inclusive), the naive approach processes each query by iterating...

Prefix Sums in One-Dimensional Arrays LeetCode Problem: Range Sum Query - Immutable Problem Overview Given an integer array nums, implement a data structure that can efficiently answer multiple queries for the sum of elements between indices left and right inculsive. Core Idea Instead of recalculati...