Range Sum Query 2D | also covers 1D array | Interview Essential | Prefix Sum

👉 👉 All my links available here: https://nikoo28.github.io/all-my-links/ Actual Problem: https://leetcode.com/problems/range-s... Chapters: 00:00 - Intro 00:42 - Range sum Query 1D 04:27 - Range sum Query 2D 05:19 - Build the prefix matrix 11:12 - Using the prefix matrix 16:05 - Dry run of Code 📘 A text based explanation is available at: https://studyalgorithms.com Code on Github: https://github.com/nikoo28/java-solut... Test-cases on Github: https://github.com/nikoo28/java-solut... 💻 Get Social 💻 Follow on Facebook at:   / studyalgos   Subscribe to RSS feeds: https://studyalgorithms.com/feed/ Join fan mail: http://eepurl.com/g9Dadv #leetcode #programming #interview