πŸ†Single Problem Contests

Welcome to the Single Problem Contest series! Ideal for a lunch break or quick mental workout, each contest features one unique, engaging problem to solve. It's competitive problem-solving made accessible, yet still filled with the thrill of a challenge.

  • Your participation is registered only upon a successful problem submission, ensuring every entry reflects a problem solved. Whether you're an experienced problem-solver or a keen learner, these contests offer a chance to challenge yourself and grow.
  • To participate, simply click on the contest you wish to join. You will be redirected to the contest page where you can submit your solution when the cintest starts.
  • Subscribe to the RSS feed to get notified of upcoming contests.
  • See the contest rules for details.
  • Prize money is paid out in the Monero (XMR) cryptocurrency to the winner after the contest has ended. To transfer the prize money to your Monero wallet you go to "Profile β†’ Settings β†’ Prize Payouts". Find the current exchange rate for XMR here.

Upcoming and Ongoing Contests

πŸ’° Prize
πŸ’¦ Difficulty
βŒ› Duration
πŸ•’ Start

User Ratings

The ELO rating system is a method for calculating the relative skill levels of participants. It assigns each participant a rating based on their performance against others. Higher ratings indicate stronger performance. Ratings are updated after each contest, considering both expected and actual outcomes. Learn more on Wikipedia.

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Full list of user ratings

Past Contests

πŸ’° Prize
πŸ’¦ Difficulty
βŒ› Duration
πŸ•’ Date
0 XMR
medium
45 minutes
2023-05-22T21:00:00+02:00
0 XMR
medium
30 minutes
2023-05-24T12:30:00+02:00
0 XMR
medium
25 minutes
2023-05-27T15:00:00+02:00
0 XMR
medium
40 minutes
2023-05-29T20:00:00+02:00
0 XMR
easy
40 minutes
2023-06-02T13:00:00+02:00
0 XMR
medium
30 minutes
2023-06-05T21:00:00+02:00
0 XMR
hard
1 hour
2023-06-11T16:30:00+02:00
0 XMR
medium
45 minutes
2023-06-18T16:30:00+02:00
0 XMR
medium
45 minutes
2023-06-25T16:30:00+02:00
0 XMR
medium
45 minutes
2023-07-02T16:30:00+02:00
0 XMR
medium
45 minutes
2023-07-09T16:30:00+02:00
0 XMR
easy
30 minutes
2023-07-16T16:30:00+02:00
0 XMR
hard
2 hours
2023-07-23T16:30:00+02:00
0 XMR
medium
45 minutes
2023-07-30T16:30:00+02:00
0 XMR
medium
30 minutes
2023-08-06T16:30:00+02:00
0 XMR
medium
1 hour
2023-08-12T16:30:00+02:00
0 XMR
medium
45 minutes
2023-08-20T16:30:00+02:00
0.05 XMR
medium
30 minutes
2023-08-27T16:30:00+02:00
0.05 XMR
medium
45 minutes
2023-09-03T16:30:00+02:00
0.05 XMR
medium
1 hour
2023-09-10T16:30:00+02:00
0.05 XMR
medium
55 minutes
2023-09-17T16:30:00+02:00
0.05 XMR
easy
45 minutes
2023-09-24T16:30:00+02:00
0.05 XMR
medium
1 hour
2023-10-01T16:30:00+02:00
0.05 XMR
medium
55 minutes
2023-10-08T16:30:00+02:00
0.05 XMR
easy
45 minutes
2023-10-15T16:30:00+02:00
0.05 XMR
medium
1 hour
2023-10-22T16:30:00+02:00
0.05 XMR
medium
1 hour
2023-10-29T16:30:00+02:00
0.05 XMR
medium
1 hour
2023-11-26T15:30:00+01:00
0.05 XMR
medium
45 minutes
2024-01-07T15:00:00+01:00
0.05 XMR
medium
3 hours
2024-01-28T15:00:00+01:00
0.02 XMR
hard
2 hours
2024-02-25T15:00:00+01:00
0.02 XMR
easy
1 hour
2024-10-06T16:30:00+02:00
0.02 XMR
medium
45 minutes
2024-10-20T16:30:00+02:00
0.02 XMR
medium
45 minutes
2024-10-27T16:30:00+02:00