Problems
| Problem | Category | Types | Points | AC % | Users | |
|---|---|---|---|---|---|---|
| IOI '94 P2 - The Castle | IOI | Graph Theory, Implementation | 10 | 18.3% | 130 | |
| IOI '94 P4 - The Clocks | IOI | Implementation | 10 | 27.3% | 122 | |
| IOI '95 P1 - Packing Rectangles | IOI | Uncategorized | 15p | 44.9% | 27 | |
| IOI '95 P2 - Shopping Offers | IOI | Uncategorized | 15p | 27.5% | 42 | |
| IOI '95 P4 - Letter Game | IOI | Uncategorized | 15p | 27.1% | 35 | |
| IOI '95 P5 - Street Race | IOI | Uncategorized | 15p | 24.5% | 40 | |
| IOI '95 Practice Task 1 - Fence Factory | IOI | Uncategorized | 15p | 21.7% | 10 | |
| IOI '95 Practice Task 2 - Word Chains | IOI | Data Structures | 12 | 44.2% | 55 | |
| IOI '95 Practice Task 3 - Bar Codes | IOI | Dynamic Programming | 12p | 36.6% | 24 | |
| IOI '96 P1 - A Game | IOI | Dynamic Programming, Game Theory | 10 | 39.6% | 282 | |
| IOI '96 P2 - Job Processing | IOI | Uncategorized | 20p | 30.1% | 54 | |
| IOI '96 P3 - Network of Schools | IOI | Graph Theory | 12p | 24.2% | 86 | |
| IOI '96 P4 - Sorting a Three-Valued Sequence | IOI | Constructive, Greedy Algorithms | 10 | 32.2% | 146 | |
| IOI '96 P5 - Longest Prefix | IOI | Dynamic Programming | 12 | 21.1% | 114 | |
| IOI '97 P1 - Mars Explorer | IOI | Graph Theory | 20p | 12.8% | 16 | |
| IOI '97 P3 - The Toxic iShongololo | IOI | Uncategorized | 20p | 45.3% | 7 | |
| IOI '97 P4 - Map Labelling | IOI | Uncategorized | 20p | 56.0% | 5 | |
| IOI '98 P1 - Contact | IOI | Data Structures | 10p | 9.3% | 59 | |
| IOI '98 P2 - Starry Night | IOI | Uncategorized | 15 | 35.1% | 30 | |
| IOI '98 P3 - Party Lamps | IOI | Ad Hoc | 12p | 34.2% | 171 | |
| IOI '98 P4 - Picture | IOI | Geometry | 15p | 31.1% | 227 | |
| IOI '98 P5 - Camelot | IOI | Uncategorized | 15p | 40.9% | 52 | |
| IOI '98 P6 - Polygon | IOI | Dynamic Programming | 15 | 32.2% | 63 | |
| IOI '99 P1 - Little Shop of Flowers | IOI | Dynamic Programming | 10 | 30.7% | 216 | |
| IOI '99 P2 - Hidden Codes | IOI | Uncategorized | 20p | 14.9% | 11 | |
| IOI '99 P4 - Traffic Lights | IOI | Uncategorized | 15 | 31.4% | 30 | |
| IOI '99 P5 - Flatten | IOI | Uncategorized | 15p | 21.6% | 16 | |
| IOI '99 P6 - A Strip of Land | IOI | Uncategorized | 20p | 13.6% | 36 | |
| IOIQR P5 - Some Game | Seasonal | Ad Hoc | 25 | 3.5% | 3 | |
| Jack Needs Help | Uncategorized | Intermediate Math | 10p | 32.0% | 20 | |
| JOI '13 Open P2 - Synchronization | JOI | Graph Theory | 35p | 29.8% | 56 | |
| JOI '13 Open P3 - Watching | JOI | Dynamic Programming | 15p | 29.7% | 100 | |
| JOI '14 Open P1 - Factories | JOI | Data Structures, Graph Theory | 20p | 32.8% | 158 | |
| JOI '14 Open P2 - Fortune Telling 2 | JOI | Ad Hoc, Data Structures | 25p | 22.9% | 90 | |
| JOI '14 Open P3 - Space Pirate | JOI | Graph Theory | 50p | 1.2% | 1 | |
| JOI '14 Open P5 - Pinball | JOI | Data Structures, Dynamic Programming | 25p | 26.3% | 95 | |
| JOI '14 Open P6 - Secret | JOI | Interactive | 17p | 16.0% | 121 | |
| JOI '16 Final P1 - Foehn Phenomena | JOI | Data Structures, Simple Math | 10p | 60.7% | 26 | |
| JOI '16 Final P2 - Semiexpress | JOI | Greedy Algorithms, Simple Math | 12 | 54.8% | 17 | |
| JOI '16 Open P2 - Selling RNA Strands | JOI | Data Structures, String Algorithms | 20 | 17.4% | 20 | |
| JOI '16 Open P3 - Skyscraper | JOI | Dynamic Programming | 25p | 41.6% | 51 | |
| JOI '17 Final P4 - Commuter Pass | JOI | Graph Theory | 15 | 26.8% | 61 | |
| JOI '17 Final P5 - Snake Escaping | JOI | Data Structures, Intermediate Math | 25p | 40.3% | 20 | |
| JOI '18 Open P1 - Bubble Sort 2 | JOI | Data Structures | 20p | 5.5% | 29 | |
| JOI '18 Spring Camp Day 1 P1 - Construction of Highway | JOI | Data Structures, Graph Theory | 30p | 34.4% | 29 | |
| JOI '18 Spring Camp Day 1 P2 - Fences | JOI | Geometry, Graph Theory | 30p | 25.0% | 1 | |
| JOI '18 Spring Camp Day 1 P3 - Tents | JOI | Dynamic Programming, Intermediate Math | 20p | 63.3% | 34 | |
| JOI '19 Final P3 - Collecting Stamps 3 | JOI | Dynamic Programming | 15 | 25.7% | 40 | |
| JOI '19 Open P1 - Triple Jump | JOI | Data Structures | 30p | 24.4% | 17 | |
| JOI '19 Open P2 - Remittance | JOI | Intermediate Math | 30p | 24.4% | 14 |