| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2719 | 171 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 929 | 501 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 375 | 1224 |
| 1297 | Palindrome | Spring School Contest 2004 | 5884 | 82 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3511 | 139 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2742 | 174 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1656 | 268 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 2063 | 201 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 231 | 1556 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1398 | 263 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 577 | 598 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5761 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 36 | 6357 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 219 | 1135 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 59 | 3531 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 558 | 429 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 260 | 763 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 80 | 2290 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 405 | 497 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 6449 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 65 | 1297 |
| 2131 | Open Cup | Later is better than never | 9 | 4867 |
| 2137 | Dynamic string complexity | Later is better than never | 8 | 5137 |
