| ID | Name | Tags | Submitters | % Correct | Average |
|---|---|---|---|---|---|
| a7m | Zagadka Fibonacciego | 156 | 92% | 97 | |
| a7n | Fibonacci sequence | math Very easy | 665 | 84% | 94 |
| aa1 | C. Anya and 1100 | 6 | 100% | 100 | |
| aad | A. Anton and Danik / Codeforces | 210 | 93% | 95 | |
| aag | D. Almost Acyclic Graph / Codeforces | 11 | 27% | 74 | |
| a_and_b | D. A and B and Interesting Substrings | 4 | 100% | 100 | |
| aap | Alya and Permutation | 6 | 83% | 83 | |
| abba | Usuwanie ABB'Y | 20 | 75% | 92 | |
| abc | Trzej znajomi | oig 13 e2 | 6 | 50% | 85 |
| abc | Zadanie ABC | proserwy 2010 | 58 | 17% | 22 |
| abc | Do You Know Your ABCs? / USACO | 69 | 88% | 93 | |
| abc | Abchazja | 86 | 87% | 87 | |
| abcz | ABC zygzak | 124 | 69% | 71 | |
| abr | Abraham | sort greedy Medium | 301 | 20% | 24 |
| abs | Task AB-words | oi 5 e1 | 7 | 28% | 70 |
| abs | Wartość bezwzględna | 474 | 94% | 95 | |
| abs | Wartość bezwzględna | 245 | 93% | 95 | |
| abs | Zadanie Maksymalna różnica | 3152 | 68% | 90 | |
| abs | Task AB-words | 9 | 0% | 42 | |
| abu | Ale bug! | 760 | 59% | 78 |