here are some of my favorite OI problems!
IOI
- 2020 comparing plants (great writeup by ecnerwala here)
- 2017 ancient books
- 2017 simurgh
- 2015 sorting
- 2018 seats
- 2018 highway tolls
- 2018 werewolf
- mechanical doll
- 2020 stations
- 2016 detecting molecules
JOI
- Designated Cities
- Dungeon 3
- Sandcastle 2
- JOI Lamps
- Two Dishes
CF
Simple
These are “simpler” problems that are still quite fun to think about.