Main APIO website

• http://apio-olympiad.org

Previous APIOs

• APIO 2020 - https://apio2020.toki.id
• APIO 2019 - https://apio2019.ru

Main IOI websites

• https://ioinformatics.org
• IOI 2021 - https://ioi2021.sg

Previous IOIs

• IOI 2020 - https://ioi2020.sg
• IOI 2019 - https://ioi2019.az
• IOI 2018 - https://ioi2018.jp