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Hot problems
| Problem | Category | Types | Points | AC % | Users | |
|---|---|---|---|---|---|---|
| Homer Simpson | Uncategorized | Dynamic Programming | 7 | 31.8% | 4 | |
| HopScotch II | Classics | Data Structures, Dynamic Programming | 12p | 23.8% | 194 | |
| Hungry | Uncategorized | Implementation | 5p | 44.2% | 115 | |
| The Hu Tao Fractal | Uncategorized | Implementation, Recursion | 7p | 23.4% | 11 | |
| Icebergs | Uncategorized | Graph Theory | 12p | 19.6% | 51 | |
| ICHB Selection Contest '17 Problem 1 - Airship Fights (Correct Version) | Uncategorized | Ad Hoc, Data Structures | 30p | 9.1% | 2 | |
| ICHB Selection Contest '17 Problem 2 - Black Star's Visit | Uncategorized | Intermediate Math | 7p | 8.5% | 26 | |
| ICHB Selection Contest '17 Problem 3 - Parallel Universe | Uncategorized | Data Structures | 12p | 23.0% | 164 | |
| Word Scrambler | Uncategorized | Recursion, String Algorithms | 5 | 50.1% | 743 | |
| Inaho X | Uncategorized | Brute Force, Interactive | 7p | 38.2% | 11 | |
| Inaho XI | Uncategorized | Geometry | 5p | 44.5% | 30 | |
| Inaho II | Uncategorized | Data Structures, Divide and Conquer | 25p | 13.6% | 32 | |
| Inaho III | Uncategorized | Graph Theory, Implementation, Simple Math | 17p | 18.6% | 32 | |
| Inaho IV | Uncategorized | Geometry | 5p | 48.7% | 160 | |
| Inaho V | Uncategorized | Implementation | 3p | 18.8% | 212 | |
| Inaho VI | Uncategorized | Brute Force, Intermediate Math | 10p | 30.8% | 42 | |
| Inaho VII | Uncategorized | Ad Hoc, Data Structures | 25p | 25.4% | 9 | |
| Inaho VIII | Uncategorized | Data Structures, Graph Theory | 20 | 27.6% | 11 | |
| Inaho IX | Uncategorized | Advanced Math | 20p | 26.1% | 47 | |
| Infinity | Uncategorized | Simple Math | 3 | 35.7% | 553 | |
| Cosmic Inflation | Uncategorized | Intermediate Math | 7 | 50.8% | 29 | |
| Count The Triplets | Uncategorized | Implementation | 7 | 10.9% | 183 | |
| Intervals | Uncategorized | Data Structures | 10p | 20.6% | 111 | |
| Expected Inversions | Uncategorized | Advanced Math, Data Structures | 12p | 33.6% | 25 | |
| A Permutation Problem 2 | Uncategorized | Ad Hoc | 12 | 31.1% | 24 | |
| IOI '00 P1 - Palindrome | IOI | Dynamic Programming | 10p | 18.6% | 856 | |
| IOI '00 P2 - Car Parking | IOI | Uncategorized | 15p | 18.3% | 55 | |
| IOI '00 P4 - Walls | IOI | Graph Theory | 12 | 36.5% | 267 | |
| IOI '00 P5 - Post Office | IOI | Dynamic Programming | 15p | 40.6% | 186 | |
| IOI '00 P6 - Building with Blocks | IOI | Uncategorized | 20p | 7.1% | 8 | |
| IOI '01 P1 - Mobile Phones | IOI | Data Structures | 15p | 27.3% | 735 | |
| IOI '01 P2 - Ioiwari Game | IOI | Game Theory | 12p | 33.6% | 10 | |
| IOI '01 P3 - Twofive | IOI | Ad Hoc | 25p | 17.1% | 67 | |
| IOI '01 P6 - Depot | IOI | Uncategorized | 30p | 13.2% | 41 | |
| IOI '02 P1 - The Troublesome Frog | IOI | Uncategorized | 15p | 16.4% | 79 | |
| IOI '02 P2 - Utopia Divided | IOI | Uncategorized | 20p | 24.7% | 92 | |
| IOI '02 P4 - Batch Scheduling | IOI | Dynamic Programming | 20p | 37.8% | 338 | |
| IOI '02 P5 - Bus Terminals | IOI | Ad Hoc | 30p | 14.8% | 53 | |
| IOI '03 P2 - Comparing Code | IOI | Uncategorized | 25p | 17.6% | 32 | |
| IOI '03 P5 - Amazing Robots | IOI | Uncategorized | 20 | 11.4% | 38 | |
| IOI '03 P6 - Seeing the Boundary | IOI | Geometry | 20p | 17.3% | 72 | |
| IOI '03 Practice Task 1 - Balancing Act | IOI | Uncategorized | 15 | 46.4% | 126 | |
| IOI '04 P1 - Artemis | IOI | Uncategorized | 15p | 6.9% | 69 | |
| IOI '04 P2 - Hermes | IOI | Uncategorized | 15p | 23.6% | 189 | |
| IOI '04 P2 - Hermes (Hard) | IOI | Data Structures | 20p | 8.1% | 9 | |
| IOI '04 P3 - Polygon | IOI | Geometry | 20p | 3.1% | 1 | |
| IOI '04 P4 - Phidias | IOI | Dynamic Programming | 10p | 54.2% | 1019 | |
| IOI '04 P5 - Farmer | IOI | Uncategorized | 15p | 13.1% | 214 | |
| IOI '04 P6 - Empodia | IOI | Uncategorized | 30p | 17.1% | 151 | |
| IOI '05 P1 - Garden | IOI | Dynamic Programming | 20p | 21.5% | 266 |