Hello Programmers!!

We, The IIITV Coding Club and Enigma (The IIITV Mathematics Club), are pleased to invite the global competitive programming community to participate in CC × Enigma: Tesseract'26, an online reverse coding contest.

Tesseract'26 is designed to move beyond traditional problem-solving formats and challenge participants through logical deduction, mathematical reasoning, and reverse engineering.

Contest Format

The problemset will contain around 9-15 problems, each of varying difficulty. The problems will not be in any particular difficulty order, so you should attempt all the questions. This contest will be held on rules of codeforces.

• Date: Sunday, 1st February, 2026
• Time: 14:00 to 17:00 IST (GMT+05:30)
• Mode: Online
• Platform: Codeforces
• Registration link: Official Website

The contest follows a reverse coding format:

• Each problem provides access to an interactive sandbox on official website.
• Participants may query the system with custom inputs
• Outputs returned by the system must be analyzed to infer the underlying logic
• No explicit problem statement is provided
• Participants must implement a program that exactly reproduces the observed behavior
• Submissions are evaluated on hidden test cases
• Standard judging rules apply (Accepted / Wrong Answer / Time Limit Exceeded)

Eligibility

• The contest is open to participants worldwide
• Participation is individual

Prizes Distribution

Total Prize Pool : ₹10,000

Prize Breakdown

• Champion: ₹3,300
• Runner Up: ₹2,700
• IIITV Special Ops Category: ₹2,300 + ₹1,700(FY)

Prizes Claim Policy

• Only participants currently studying in Indian institutions are eligible for prizes
• International participants are welcome to compete but will not be considered for prize distribution

To claim prizes, a participant must:

• Have valid contest submissions
• Be registered on Unstop
• Be registered on the official event website
• Comply with all contest rules and verification requirements

Failure to meet any of the above conditions will result in forfeiture of prize eligibility, regardless of contest rank.

Organizing Team

The problems were authored and tested by the members of the IIITV Coding Club and Enigma — IIITV Mathematics Club.

Event Coordinators: Mr.Quantum_1915, SarahSpeedy, tarundeepakjain, ZodiacZ408, Arpitmaheswari

Problem Setters: ZodiacZ408, Mr.Quantum_1915, Arpitmaheswari, tarundeepakjain

Updates

Update 1: Registrations are open on Unstop and the official event website, participants must complete both registrations to be eligible for prizes.

Update 2: All participants must set up OBS and record their screen during the contest. The recording must be shared with the organizers if requested. If you wish to participate without consideration for prizes, this is not mandatory.

Update 3: Contest link is here.

Update 4: Editorial of problems are out now.

Update 5: The results are out now — congratulations to all the winners. 1. ekatasingh290304 — Ekata Singh, IGDTUW 2. TheEgoist — Parth Sahu, NSUT