Note: The text editorials will be provided by the authors of the round. This video tutorial acts as an additional resource for those who prefer video over text, not as a substitute for the text editorial.

2009A — Minimize!

2009B — osu!mania

2009C — The Legend of Freya the Frog

2009D — Satyam and Counting

2009E — Klee's SUPER DUPER LARGE Array!!!

2009F — Firefly's Queries

2009G — Yunli's Subarray Queries