This part of the DSA Tutorial runs from Prefix Sums and Range Queries. There is 1 lesson here, and working through them takes about 6 minutes at a steady pace.
It follows on from Intervals, so finish that first if you have not already — the examples below assume you are comfortable with it.
Each lesson below says what it covers before you open it. Read them in order the first time; afterwards this page works as a index you can jump back into when you need to check one thing.
