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| ID | Nazwa | Znaczniki | Zgłosiło | %Rozwiązało | Średnio |
|---|---|---|---|---|---|
| cipher | cipher | 3 | 33% | 58 | |
| cipher | cipher | 1 | 100% | 100 | |
| ciu | Ciuchcia | 393 | 88% | 91 | |
| csh | Clash! | 15 | 73% | 75 | |
| climb | climb | 1 | 100% | 100 | |
| clo | Cloud computing | ceoi 2018 d1 | 87 | 73% | 85 |
| clc | Clumsy Cows / USACO Silver | 10 | 90% | 97 | |
| mam | C. Maximum Median / Codeforces | 17 | 82% | 89 | |
| cmo | Ciąg monotoniczny | 16 | 75% | 86 | |
| collect | collect | 1 | 0% | 98 | |
| com | Co ma babcia Bajtazara do darmowego kebaba? | lis dp Trudne | 475 | 77% | 81 |
| compare | compare | 1 | 100% | 100 | |
| cw1 | Co na wejściu? | 384 | 66% | 93 | |
| coa | Concatenation of Arrays / Codeforces / C | 6 | 50% | 63 | |
| connect | connect | 1 | 100% | 100 | |
| connect | connect | 1 | 0% | 45 | |
| cou | 1D Coulomb | 15 | 100% | 100 | |
| coh | Counting Haybales / USACO Silver | 74 | 91% | 93 | |
| cow1 | Czy Or jest większy 1 | 10 | 100% | 100 | |
| cbp | Cow Beauty Pageant (Silver Level) | 5 | 80% | 87 |