Hello Codeforces!!

I, amartya110, and mahesh_9996 are excited to invite you to the fourth installment of our contest series: CodeHurdle Athlos 04. After the success of our previous three rounds on this platform, we are back with an even more challenging and diverse problem set.

The contest will take place on Apr/14/2026 17:30 (Moscow time).

Prize Pool

We are offering a total prize pool of ₹10,000!

• (Details regarding the prize distribution for top rankers will be shared on our website and community groups.)

Registration & Participation

To participate in Athlos 04, please follow these steps:

• Register on our website: Visit codehurdle.com. The official contest link and registration portal will be available there.
• Join the Community: Stay updated with real-time announcements and receive the direct contest link by joining our WhatsApp Group.

Contest Details:

• Duration: 3 hours
• Problems: 8 original problems
• Format: ICPC Rules (10-minute penalty for incorrect submissions)
• Standings: We will continue to highlight our "Elite Athletes"—those who compete with consistency and integrity.

We hope you find the problems stimulating—we've designed them to ensure that every participant, from beginner to expert, walks away with at least a few new tricks in their bag.

A Serious Note on AI

As with our previous rounds, we maintain a zero-tolerance policy regarding AI use. CodeHurdle is a space for human logic. If you are caught using AI to generate solutions, your account will be skipped in the standings and flagged. We are actively scouring submissions—play fair.

Credits & Gratitude

This round wouldn't be possible without the hard work of a dedicated team:

• Problem Setters: A collaborative effort between mahesh_9996, Ajay_2705, Lucifer_K, and myself (amartya110). We’ve aimed for elegance and challenge in equal measure.
• Campus Partners: A special thanks to the Kiet Koders Korner (K3) club at KIET, PyC Coding Club at IIIT Bhagalpur, Coding Club BITS Pilani at Birla Institute of Technology and Science, Pilani, House of Geeks Technical Society of IIIT Ranchi at IIIT Ranchi, Programming and Algorithms Group (PAG) at Indian Institute of Technology, Roorkee, CSEC NITH at NIT Hamirpur, SSDC from SLIET Punjab and Computer Coding Club at MNNIT Allahabad for organizing the 2nd Round at their campus.
• The Testers: A huge shoutout to our testing team Vikas_soni, mahesh_9996, Lucifer_K, Ajay_2705 and _ronak_.
• The Community: Thank you to the ever-growing Codeforces community.
• You: For pushing your limits and competing with integrity.

Good luck to everyone! We’ll see you on the leaderboard.

Athlos 04 — Let the sprint begin!

Update: Contest Registration Link: https://mirror.codeforces.com/contestInvitation/6c72cb15c0d7e2da5cc4a85dad11e2b88061c464