Hi, experimentally, this year, we decided to open an unofficial mirror for IOI 2021, because there is no official mirror this year.

We created a separate post for the mirror in order to avoid spoilers. Please don't spoil the tasks here and discuss the tasks in these posts instead: Day 1, Day 2

Note that you can solve the problems without participating: https://oj.uz/problems/source/575

UPD: It's over, thanks for participating. Scoreboard

Links

• Day 1: https://oj.uz/contest/view/IOI2021DAY1
• Day 2: https://oj.uz/contest/view/IOI2021DAY2
• Scoreboard

Information

• Programming language: C++17 (GCC 10, Ubuntu)
• Duration: 5 hours whenever you want
• You can start the contest until Jun 30, 2021, 02:59:59 PM UTC (subject to change)
• Contest System: It almost looks like CMS. Unfortunately, only English and Korean UI are available.
• All official task translations are available.
• Scoring rule: Use the sum over each subtask of the best result for that subtask across all submissions (IOI 2017-)
• Scoreboard is not available during the contest window, maybe we will publish them after the contest is over.