Problems
| Problem Name | Code | Points | Users | AC Rate | Date Added |
|---|---|---|---|---|---|
| IOI '94 - The Triangle | ioi9411 | 7 | 632 | 60.19% | 2013-12-25 |
| IOI '94 - The Castle | ioi9412 | 10 | 143 | 24.63% | 2013-12-25 |
| IOI '94 - The Primes | ioi9413 | 25p | 24 | 7.02% | 2013-12-26 |
| IOI '94 - The Clocks | ioi9421 | 10 | 106 | 26.79% | 2013-12-26 |
| IOI '94 - The Buses | ioi9422 | 20p | 17 | 5.42% | 2009-08-20 |
| IOI '94 - The Circle | ioi9423 | 17p | 11 | 34.38% | 2009-08-20 |
| IOI '95 Practice Task - Fence Factory | ioi9501 | 15p | 7 | 17.50% | 2014-04-11 |
| IOI '95 Practice Task - Word Chains | ioi9502 | 12 | 40 | 32.60% | 2014-04-13 |
| IOI '95 Practice Task - Bar Codes | ioi9503 | 20p | 17 | 37.74% | 2014-04-13 |
| IOI '95 - Packing Rectangles | ioi9511 | 15p | 20 | 47.92% | 2013-12-24 |
| IOI '95 - Shopping Offers | ioi9512 | 15p | 34 | 28.77% | 2013-12-25 |
| IOI '95 - Letter Game | ioi9521 | 15p | 25 | 21.28% | 2013-12-25 |
| IOI '95 - Street Race | ioi9522 | 15p | 33 | 25.19% | 2013-12-25 |
| IOI '96 - A Game | ioi9611 | 10 | 188 | 48.40% | 2013-12-22 |
| IOI '96 - Job Processing | ioi9612 | 20p | 42 | 36.91% | 2013-12-22 |
| IOI '96 - Network of Schools | ioi9613 | 20p | 64 | 23.18% | 2013-12-22 |
| IOI '96 - Sorting a Three-Valued Sequence | ioi9621 | 10 | 110 | 31.91% | 2013-12-22 |
| IOI '96 - Longest Prefix | ioi9622 | 12 | 90 | 16.35% | 2013-12-22 |
| IOI '96 - Magic Squares | ioi9623 | 15p | 70 | 29.61% | 2013-12-22 |
| IOI '97 - The Toxic iShongololo | ioi9713 | 20p | 1 | 1.80% | 2013-12-26 |
| IOI '97 - Map Labelling | ioi9721 | 20p | 1 | 4.88% | 2013-12-26 |
| IOI '97 - Character Recognition | ioi9722 | 30p | 5 | 2.33% | 2013-12-27 |
| IOI '98 - Contact | ioi9811 | 15p | 36 | 10.75% | 2013-12-21 |
| IOI '98 - Starry Night | ioi9812 | 15 | 22 | 36.51% | 2013-12-21 |
| IOI '98 - Party Lamps | ioi9813 | 15p | 101 | 31.02% | 2013-12-21 |
| IOI '98 - Picture | ioi9821 | 20 | 67 | 27.16% | 2013-12-21 |
| IOI '98 - Camelot | ioi9822 | 15p | 41 | 41.30% | 2013-12-21 |
| IOI '98 - Polygon | ioi9823 | 15 | 48 | 28.35% | 2009-08-20 |
| IOI '99 - Hidden Codes | ioi9912 | 20p | 8 | 16.46% | 2009-08-20 |
| IOI '99 - Traffic Lights | ioi9921 | 15 | 19 | 26.37% | 2009-08-21 |
| IOI '99 - Flatten | ioi9922 | 30p | 14 | 19.47% | 2009-08-22 |
| IOI '99 - Little Shop of Flowers | ioi9911 | 10 | 123 | 29.18% | 2009-08-20 |
| IOI '99 - A Strip of Land | ioi9923 | 25p | 28 | 9.50% | 2009-08-22 |
| IOI '00 - Car Parking | ioi0012 | 15p | 37 | 15.27% | 2009-08-22 |
| IOI '00 - Walls | ioi0021 | 10 | 86 | 30.62% | 2009-08-22 |
| IOI '00 - Building with Blocks | ioi0023 | 20p | 5 | 23.33% | 2009-08-23 |
| IOI '00 - Palindrome | ioi0011 | 10 | 364 | 20.98% | 2009-08-22 |
| IOI '00 - Post Office | ioi0022 | 15p | 149 | 39.50% | 2009-08-22 |
| IOI '01 - Depot | ioi0123 | 30p | 36 | 11.58% | 2010-03-07 |
| IOI '01 - Mobile Phones | ioi0111 | 15p | 238 | 18.83% | 2014-06-24 |
| IOI '01 - Twofive | ioi0113 | 25p | 20 | 6.38% | 2013-12-21 |
| IOI '02 - Utopia Divided | ioi0212 | 20p | 77 | 22.22% | 2010-07-25 |
| IOI '02 - The Troublesome Frog | ioi0211 | 15p | 67 | 17.31% | 2010-06-18 |
| IOI '02 - Batch Scheduling | ioi0221 | 17p | 139 | 20.88% | 2010-06-02 |
| IOI '02 - Bus Terminals | ioi0222 | 30p | 50 | 14.22% | 2010-06-19 |
| IOI '03 - Comparing Code | ioi0312 | 25p | 27 | 14.84% | 2010-06-22 |
| IOI '03 - Seeing the Boundary | ioi0323 | 20p | 30 | 10.64% | 2010-03-05 |
| IOI '03 Practice Task - Balancing Act | ioi0301 | 15 | 96 | 47.15% | 2014-04-13 |
| IOI '03 - Amazing Robots | ioi0322 | 20 | 36 | 9.47% | 2009-12-15 |
| IOI '04 - Hermes | ioi0411 | 15p | 162 | 23.75% | 2010-06-22 |
