Prefix Sum Algorithm | Sum Query in O(1) | Free DSA Tutorials by SCALER

In this video, we talk about problem solving technique called Prefix sum, which is used to solve range queries. The video explains how to solve sum queries in O(1).
Contents of Video:
The problem of sum queries and its brute force solution
Intuition behind prefix sum
Construction of prefix sum array and solution to sum queries
Discussion of an interview problem based on prefix sum

0:00 Introduction
0:22 : Content of the video
1:03 : Sum of queries problem
6:11 : Intuition behind prefix sum
11:33 : Construction of prefix sum
27:15 : Pseudocode of sum of queries problem
29:15 : Time and Space complexity
32:38 : Question on prefix sum: Count of equilibrium index
41:50 : Pseudocode of the problem
49:05 : Time and Space complexity


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