Coding & Algorithms Tournament 2026
CAT is a Nationwide Competitive Programming Competition made by Ecommurz and CSRelatedCompetitions as a celebration of programming skills, one of the key drivers of innovation in the 21st century. The coding competition is open for all Indonesians worldwide 🇮🇩🌏.
Built alongside some of the Indonesians who contributed to IOI, ICPC, and Google Code Jam. Top engineers making complex problems for the top 1%.
+ Is an Indonesian Citizen, all ages welcome
+ No LLMs, no Vibecoding; your raw coding skills
More detailed category rules and eligibility are in the guidebook.
Join us on the FINAL Round! Limited slots!
+ BINUS @Alam Sutera, 6 June 2026, 17:00-20:00 WIB
+ Google Cloud and Virtu Financial will be opening their booths.
+ Free lunch and dinner.
+ Get limited-edition SWAGs from CAT and sponsors.
And more!
Prize Pool
of IDR
135.000.000++
Prizes and benefits for the top 30 finalists & winners:
+ Cash prize for winners
+ Google Cloud Credits for winners
+ Transportation & accommodation support for onsite finals
+ CV drop opportunities
+ A lot of merchandise!
Additional Prizes: Giveaways for participants and top referrers
| 12/04 | 23:59 WIB | Batch 1 registration deadline |
| 18/04 | 19:00-20:00 WIB | (Optional) Technical Meeting for Preliminary round batch 1 |
| 18/04-19/04 | (Optional) Practice Session for Preliminary round batch 1 | |
| 25/04 | 19:05-20:35 WIB | Preliminary round (Babak Penyisihan): batch 1 |
| 28/04 | 23:59 WIB | Registration final deadline |
| 02/05 | 19:00-20:00 WIB | (Optional) Technical Meeting for Preliminary round batch 2 |
| 02/05-03/05 | (Optional) Practice Session for Preliminary round batch 2 | |
| 03/05 | 19:05-20:35 WIB | Preliminary round (Babak Penyisihan): batch 2 |
| 16/05 | 19:05-21:05 WIB | Semifinals |
| 06/06 | All day | Onsite final round in Greater Jakarta Area |
For the preliminary rounds (babak penyisihan), you may join one batch, or both, depending on which dates fit your schedule best. Note that if you had registered after 12 April, you can only participate in the batch 2.
Free Coding & Algorithms Workshops by MurzEdu at @murzfam — open to everyone.
Preparing for CAT, OSN Informatics, GEMASTIK Div. 1, ICPC, or DSA interviews? We got you covered by our legendary and experienced instructors, from an OSN Informatics Trainer to a Tech Lead.
Free for all. Watch the archive here.
| 28/03 | Basic Programming & Complexity Analysis — Watch here |
| 31/03 | Data Structures — Watch here |
| 04/04 | Problem Solving Paradigm 1: Greedy & Complete Search — Watch here |
| 07/04 | Graphs — Watch here |
| 11/04 | Problem Solving Paradigm 2: Dynamic Programming — Watch here |
Got competitive programming questions stuck in your head?
Access past CAT 2026 rounds problems, written analysis, and the live solve here.
