H
| Problem ID | Title | Solution by | Most Popular Input by |
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| HACKRNDM | Hacking the Random Number Generator |
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| HALLOW | Halloween Treats |
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| HARSHAD | Devlali Numbers |
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| HC12 | Card Game |
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| HEAPULM | Binary Search Heap Construction |
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| HEISLAZY | He Is Lazy |
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| HELPBOB | Help Bob |
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| HELPDONN | Help Donn |
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| HELPR2D2 | Help R2-D2! |
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| HERDING | Herding |
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| HG | HUGE GCD |
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| HIGH | Highways |
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| HIKE | Hike on a Graph |
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| HIST2 | Histogram |
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| HISTOGRA | Largest Rectangle in a Histogram |
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| HMBY | Hablu Wants to Buy |
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| HNUMBERS | HNumbers |
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| HOLI | Holiday Accommodation |
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| HORRIBLE | Horrible Queries |
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| HPYNOS | Happy Numbers |
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| HPYNOSII | Happy Numbers II |
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| HS08PAUL | A conjecture of Paul Erdős |
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| HS09EQ | Diophantine Equation |
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| HUBULLU | Hubulullu |
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| HUSGAME | Huseyn and His Game |
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