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Zonal Informatics Olympiad
IARCS Stage-1 informatics olympiad. Pen-and-paper paper on algorithmic problem-solving — no programming language knowledge required. 4 problems in 3 hours.
Updated 17 Aug 2026 ·Vacancy counts change every cycle — always confirm the exact number in the latest official notification before applying.
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Source: official exam authority notification · refreshed weekly. How this works →
Free ZIO preparation on Shishya
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Measuring Algorithm EfficiencyA nested loop structure has the outer loop running n times and the inner loop running m times. What is the time complexity?
Tap an option to check your answer.
డయగ్నోస్టిక్తో ప్రారంభించండి
మీరు ఎక్కడ ఉన్నారో చూడటానికి syllabus అంతటా 10 ప్రశ్నలు.
అధికారిక నోటిఫికేషన్ PDFల నుండి PYQలు సేకరిస్తున్నాం. త్వరలో వస్తుంది.
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ZIO — Quick Practice
FULL20 ప్రశ్నలు · 180 నిమి
మాక్ ప్రారంభించండి →Full-length subject tests below — 25 questions each, real exam format, instant scoring. Want to drill a single topic? Every topic has its own 10-question test in the syllabus.
Algorithmic Problem Solving
20 QsTell Shishya exactly what to test you on — topics, size, difficulty — and get a fresh mock in seconds. Leave the box blank and we'll target your weakest topics.
లీడర్బోర్డ్లో మీరు ఎక్కడ ఉన్నారో చూడటానికి మాక్ తీసుకోండి.
Students
1
Mocks taken
2
Average score
85%
Top score
100%
What can I get from ZIO?
Mock-score → expected rank → likely outcome. Use the mocks below to find your current band, then plan how many marks you need to climb.
Elite tier — IOI potential
95–100% · Post-based exam (no numeric rank)
National camp probable
90–95% · Post-based exam (no numeric rank)
IARCS has confirmed that details for the Indian Computing Olympiad 2027 cycle will be announced in the second half of September 2026, with registrations opening in October 2026.
The Indian team of four students selected through the ICO process will represent India at the International Olympiad in Informatics 2026 to be held in Uzbekistan.
IARCS conducted the Indian National Olympiad in Informatics (INOI-2026) on February 14, 2026. Approximately 30 top performers will be selected for the IOI Training Camp.
ఏదైనా టాపిక్పై ట్యాప్ చేయండి — నోట్స్ + 10 ప్రశ్నల టాపిక్ టెస్ట్
Introduction to Algorithms
What an algorithm is, step-wise problem decomposition, pseudocode reading.
Measuring Algorithm Efficiency
Time and space complexity intuition, big-picture growth rates without formal Big-O.
Searching
Linear search, binary search and variants over sorted/unsorted data.
Sorting
Selection, insertion, merge and quick sort intuition; stability and order properties.
Recursion
Recursive thinking, base/recursive cases, recursion tree, divide-and-conquer.
IOITC selection range
82–90% · Post-based exam (no numeric rank)
INOI strong contenders
70–82% · Post-based exam (no numeric rank)
INOI qualification range
55–70% · Post-based exam (no numeric rank)
Regional participation range
35–55% · Post-based exam (no numeric rank)
Below qualification threshold
0–35% · Post-based exam (no numeric rank)
AI-curated from historic cut-off patterns. Always verify with the latest official notification before making decisions.
The Zonal Informatics Olympiad 2026 results were announced in the third week of December 2025, with qualified students advancing to INOI-2026 held in February 2026.
ICO-2027 notification announcement expected
17 రోజులు మిగిలాయిWed, 9 Sept, 2026
IARCS to announce detailed schedule for ICO-2027 cycle
ICO-2027 registration opens
42 రోజులు మిగిలాయిSun, 4 Oct, 2026
Online registration portal opens for ZIO and ZCO 2027
ZIO-2027 registration deadline (expected)
69 రోజులు మిగిలాయిSat, 31 Oct, 2026
Last date to register for Zonal Informatics Olympiad 2027
ZIO-2027 admit card release (expected)
74 రోజులు మిగిలాయిThu, 5 Nov, 2026
Hall tickets available approximately 5 days before exam
🏅ZIO-2027 exam day (expected)
79 రోజులు మిగిలాయిTue, 10 Nov, 2026
Written exam held at centers across India, 2 PM to 5 PM
ZIO-2027 results announcement (expected)
107 రోజులు మిగిలాయిTue, 8 Dec, 2026
Qualified candidates advance to INOI-2027
🏅ZCO-2027 exam (expected)
162 రోజులు మిగిలాయిMon, 1 Feb, 2027
Programming exam supporting C++, Java, and Python
🏅INOI-2027 exam (expected)
169 రోజులు మిగిలాయిMon, 8 Feb, 2027
Second round programming test, C++ only
Counting Principles
Sum and product rules, permutations, combinations applied to small enumerations.
Pigeonhole Principle
Existence arguments via pigeons/holes — colourings, residues, pairs.
Parity and Modular Reasoning
Even/odd reasoning, basic modular arithmetic for invariants.
Elementary Number Theory
Divisibility, gcd/lcm reasoning, prime factorisation puzzles.
Combinatorial Games
Winning/losing positions, Nim-like games, strategy stealing.
Sets and Logic
Inclusion-exclusion, propositional logic, truth tables in puzzles.
Constructive Problems
Building an explicit example/configuration that satisfies given rules.
Optimisation Puzzles
Finding minimum/maximum of a quantity under given constraints.
Scheduling and Ordering
Sequencing tasks, jobs or moves to satisfy precedence/deadline rules.
Grid and Geometry Puzzles
Reasoning on 2D grids — paths, colourings, tilings, distance puzzles.
Three Concrete Inputs Format
ZIO-style problems — solve three increasingly large concrete inputs by spotting an efficient method.