| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Inna and New Matrix of Candies | Codeforces | Codeforces Round #234 (Div. 2) | 3 |
| 2 | Sereja and Brackets | Codeforces | Codeforces Round #223 (Div. 1) & Codeforces Round #223 (Div. 2) | 3 |
| 3 | Rock-paper-scissors | Codeforces | School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) | 5 |
| 4 | New Year Tree Decorations | Codeforces | Good Bye 2013 | 9 |