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2D-Prefix Sum

The 2D prefix sum, or summed-area table, is a data structure that enables efficient computation of the sum of elements in any rectangular sub-region of a 2D array. By precomputing the cumulative sums and storing them in a separate 2D table, the 2D prefix sum allows you to quickly determine the sum of any desired rectangular region using just four values from the precomputed table. This makes it a valuable tool for a variety of applications, from computer graphics and image processing to sliding window algorithms and efficient data analysis on 2D grids. 📍The problems: 1. Forest Queries: https://www.google.com/url?q=https://... 2. Counting Rectangles:https://www.google.com/url?q=https://... 3. Hits Different:https://www.google.com/url?q=https://... 📍If you have any questions feel free to reach out to our ICPC NU platforms : Instagram: https://www.instagram.com/nu.icpc?igs... Facebook: https://www.facebook.com/ICPCNU?mibex... #2D-prefixsum #prefixsum #ICPC_NU_COMMUNITY #CompetitiveProgramming #ProblemSolving #ICPC #ECPC #codeforcessolutions #Forest_Queries #Counting_Rectangles #Hits_Different