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| ID | Nazwa | Znaczniki | Zgłosiło | %Rozwiązało | Średnio |
|---|---|---|---|---|---|
| ci | Ciężarówki | 1 | 0% | 40 | |
| cie | Ciężarówki | oig 15 e3 | 68 | 27% | 50 |
| cie | Ciężarówki II | oig e3 16 | 76 | 80% | 85 |
| cie | Ciężarówki III | oig e3 d1 18 | 74 | 89% | 91 |
| CIG | Kółeczka | 4 | 75% | 95 | |
| CIG | Ciag | 3 | 66% | 86 | |
| ciu | Ciuchcia | 364 | 87% | 91 | |
| clo | Cloud computing | ceoi 2018 d1 | 84 | 72% | 84 |
| com | Co ma babcia Bajtazara do darmowego kebaba? | lis dp Trudne | 361 | 74% | 78 |
| cw1 | Co na wejściu? | 109 | 58% | 89 | |
| coa | Concatenation of Arrays / Codeforces / C | 4 | 50% | 62 | |
| cou | 1D Coulomb | 13 | 100% | 100 | |
| coh | Counting Haybales / USACO Silver | 8 | 87% | 90 | |
| cbp | Cow Beauty Pageant (Silver Level) | 5 | 80% | 87 | |
| ccl | Cow College / USACO Bronze | 99 | 87% | 92 | |
| ct2 | Cowntact Tracing 2 / USACO Bronze | 7 | 57% | 62 | |
| ranom | C. Ranom Numbers | 3 | 100% | 100 | |
| ctb | Czy tu już byłem? | 8 | 25% | 37 | |
| ctsd | Czy to samo drzewo? | 42 | 85% | 86 | |
| cuk | Cukierki | 1 | 100% | 100 |