Zonal Computing Olympiad (ZCO)
by Indian Association for Research in Computing Science (IARCS)
Admission Advantage at Top Universities
530 participants
ZCO is India's leading online coding competition for school students (Class 1-12), designed to enhance algorithmic thinking and problem-solving skills. It's a direct pathway to qualify for the Indian National Olympiad in Informatics (INOI) and the International Olympiad in Informatics (IOI).
Mode
In-Person
Fee
₹472
Participation format
Individual
Duration
3 hours
Eligibility
ZCO is open to all school students across India, from Class 1 to Class 12, enrolled in any school board. While there's no lower age limit, participants must be under 20 years of age on July 1st of the International Olympiad in Informatics (IOI) year. Students who have completed Class 12 are not eligible. Participants should have a strong interest in computer science and competitive programming. The competition is held at designated centers across various cities in India.
- Grade level
- Grade 1 to 12
- Age range
- 6 to 18 years
- Eligibility region
- Available nationwide across India
- Academic requirement
- Must be a school student currently enrolled in a school in India, from any school board. Students who have completed Class 12 are not eligible, even if taking a break or redoing exams. Participants must be under 20 years of age on July 1st of the IOI year.
- Prerequisites
- Basic knowledge of a programming language (C, C++, Java, or Python).
- Familiarity with fundamental data structures such as arrays, linked lists, and trees.
- Understanding of basic algorithms like searching and sorting.
- Strong logical and analytical reasoning abilities.
- Ability to write and debug code independently.
- Understanding of basic mathematical concepts, including logic and combinatorics.
See if your child qualifies.
Rewards and recognition
Award
Top performers in the later stages of the Indian Computing Olympiad (INOI and IOITC) may be awarded scholarships and cash prizes.
Prizes
Medals for Top Performers
Top performers in the later stages of the Indian Computing Olympiad (INOI and IOITC) can earn prestigious medals.
Certificate
Certificate of Participation from IARCS
All participants receive a Certificate of Participation from IARCS, acknowledging their involvement in this national-level competition.
Opens doors to
Top performers in ZCO, INOI, and IOITC gain significant admission advantages at prestigious Indian institutions like Chennai Mathematical Institute (CMI), IIIT Delhi, IIIT Hyderabad, and IIT Gandhinagar. International universities such as the Hong Kong University of Science and Technology, Nanyang Technical University (NTU) Singapore, and National University of Singapore (NUS) also offer special consideration or scholarships to IOI medalists.
Career pathways
Excelling in ZCO and subsequent ICO stages significantly boosts career prospects in the technology sector, opening doors to internships and job opportunities at leading tech companies. It showcases advanced problem-solving and coding abilities highly sought after in the industry.
Recognition
National & International Recognition
Skills your child builds
Key dates
Last edition
- Registration opened
- 28 Oct 2025
- Registration closed
- 19 Dec 2025
- Competition
- 8 Feb 2026
How to apply
- 1Online registration through the official IARCS website (www.iarcs.org.in/inoi/).
- 2Payment of the non-refundable registration fee online via internet banking, debit card, credit card, or UPI.
- 3Admit cards will be available for download approximately 5 days before the exam on the IARCS website.
- 4Participants must carefully review the detailed eligibility criteria and competition rules before registering to ensure full compliance.
- 5It is highly recommended to register well in advance of the deadline to avoid last-minute technical issues and ensure a smooth application process.
Rules and guidelines
- Solutions are judged primarily on correctness, efficiency (time and memory limits), and adherence to problem constraints.
- Partial points may be awarded for solving subtasks within a problem.
- Emphasis is placed on the clarity and elegance of the code.
- Any participant found to be indulging in any form of malpractice will be immediately disqualified.
- Cellphones and other electronic devices are not allowed in the examination hall.
- Using multiple IDEs together may lead to slow system, system may hang or crash. Be careful while using heavy IDEs.
- The leaderboard and other users' activity will not be visible to the participants during the contest.
Technology requirements
- Details about compilers, IDEs, and other aspects of the contest environment are announced by IARCS.
- A stable internet connection is crucial for the online contest environment.
- Participants are expected to write code in C, C++, Java, or Python. C++ is highly recommended for subsequent rounds.
- Details about specific compilers, IDEs, and other aspects of the contest environment are announced by IARCS on their official website.
- It is recommended to use Google Chrome browser for the online platform to ensure compatibility and optimal performance.
- A stable internet connection is crucial for the online contest environment, especially for submitting solutions and accessing problem statements.
- Familiarity with an online judge system is beneficial for practicing and understanding submission procedures.
Fees and financial support
Fee details
The non-refundable registration fee for ZCO is ₹472 (₹400 + GST), payable online via internet banking, debit card, credit card, or UPI. Fees are subject to change; participants should refer to the official IARCS website (www.iarcs.org.in/inoi/) for the most current information. Group discounts may be available for bulk registrations (10 or more participants); interested schools or groups should contact IARCS directly for details. The fee covers the cost of administering the exam, providing access to the online platform, and evaluating the solutions. It is advisable to have a valid payment method ready before starting the registration process to ensure a smooth experience.
Refund policy
Registration fees for ZCO are strictly non-refundable. Participants are advised to carefully review the eligibility criteria and competition rules before completing their registration. In case of technical issues during the registration process, participants should contact IARCS support for assistance. It is crucial to understand that once paid, the fee will not be reimbursed under normal circumstances, so ensure full commitment before payment.
About this opportunity
The Zonal Computing Olympiad (ZCO) is an annual computer programming contest held in India as part of the Indian Computing Olympiad (ICO) program. It serves as a crucial first step for students aspiring to represent India in international computer programming tournaments.
ZCO emphasizes logical thinking, algorithmic problem-solving, and fundamental programming skills, assessing a student's ability to solve complex problems using efficient methods and clear computational thinking. This competition is a significant opportunity for students interested in computer science and problem-solving.
By participating in ZCO, students begin their journey into algorithms and competitive coding in a supportive environment that fosters improvement. Open to all school students up to Class 12, ZCO provides a national platform to test informatics skills and potentially advance to global competitions.
Success in ZCO not only builds confidence but also opens doors to advanced programming opportunities and potential scholarships. It helps students learn about computer science and pick up important skills that will help them do well in school and their future jobs.
Exam format
- Total marks
- 200
- Duration
- 180 minutes
- Format
- Problems require significant algorithmic and computational insight. Students are expected to design efficient algorithms, optimize their solutions, and demonstrate strong programming skills. Typically, two problems are given, each with subtasks to award partial points. The problems are designed to test a student's ability to apply data structures and algorithms to solve real-world computational challenges.
- Language
- English
Rounds and format
The Indian Computing Olympiad (ICO) comprises three main stages: 1. Zonal Round (ZIO/ZCO): ZCO is an online programming contest, while ZIO is a written exam. Students can participate in either or both. ZCO typically involves 2 problems, each worth 100 marks, with subtasks for partial points. 2. Indian National Olympiad in Informatics (INOI): This is a programming competition for students who qualify from ZIO/ZCO. It involves solving two algorithmic problems in three hours, primarily using C++. Approximately 250-300 students are selected for INOI from the zonal rounds. 3. International Olympiad in Informatics Training Camp (IOITC): A residential training camp for approximately 30 top INOI performers, leading to the final selection of the four-member Indian team for the International Olympiad in Informatics (IOI). This camp typically lasts 10-15 days and includes intensive training sessions, mock contests, and mentorship from experienced coaches.
How entries are judged
Solutions are judged primarily on correctness, efficiency (time and memory limits), and adherence to problem constraints. Partial points may be awarded for solving subtasks within a problem. Emphasis is also placed on the clarity and elegance of the code.
Selection process
Approximately 250-300 students from ZIO and ZCO combined are selected for INOI based on their performance in the first round. The top 30 students from INOI are then selected for the IOITC. The final four-member Indian team for the IOI is selected from the IOITC participants. Selection criteria are strictly based on performance in the respective rounds, with a strong focus on problem-solving skills and coding proficiency.
How to prepare
- IARCS official website (www.iarcs.org.in/inoi/) for past question papers and solutions.
- CodeChef's ZCO Practice site and other competitive programming platforms like Codeforces, HackerRank, and LeetCode.
- Official ICO Online Study Material provided by IARCS.
- Textbooks such as 'Introduction to Algorithms' by Cormen, Leiserson, Rivest, and Stein (CLRS).
- Mentoring programs offered by past IOITC participants.
- Online tutorials for C++ and Standard Template Library (STL) functions.
- Solving problems from the IARCS Problems Archive and CodeDrills.
- Participating in weekly competitive programming contests to simulate exam conditions.
- USACO Guide for comprehensive resources on topics and practice problems.
- Websites like GeeksforGeeks for theoretical concepts and practice problems.
Academic details
Difficulty: Mixed Levels
What's covered
The official syllabus for ZCO is based on the Basic Topics in the ICO Online Study Material provided by IARCS. This includes: Introduction to programming concepts, Efficiency of algorithms, Searching algorithms (e.g., binary search), Sorting algorithms (e.g., quicksort, mergesort), Basic Graph Algorithms, Dynamic Programming, Greedy Algorithms, Computing Shortest Paths, Heaps, Permutations, Directed Acyclic Graphs, Computing Prefix Sums, and Sliding Window Algorithms. For INOI and IOITC, the syllabus aligns with the International Olympiad in Informatics (IOI) syllabus, covering more advanced topics in competitive programming. Students are strongly encouraged to review the detailed syllabus on the IARCS website for comprehensive preparation.
Frequently asked questions
How can students effectively manage performance anxiety during the Zonal Computing Olympiad?
Students can manage performance anxiety by practicing mock tests under timed conditions to simulate the exam environment. Developing a consistent preparation routine, focusing on problem-solving strategies rather than just memorization, and incorporating relaxation techniques can also be beneficial. Adequate sleep and nutrition before the competition are crucial for optimal mental performance.
What are some common mistakes participants make during ZCO and how can they be avoided to maximize scores?
Common mistakes include misinterpreting problem statements, failing to consider edge cases, inefficient algorithm design, and poor time management. To avoid these, participants should read problems carefully, test solutions with various inputs, prioritize problems based on difficulty and points, and allocate time wisely. Debugging skills are also essential to quickly identify and fix errors.
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