| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2552 | 173 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 878 | 504 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 331 | 1316 |
| 1297 | Palindrome | Spring School Contest 2004 | 5443 | 85 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3142 | 149 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2552 | 178 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1471 | 286 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1801 | 216 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 200 | 1658 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1304 | 261 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 545 | 582 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5216 | 62 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 33 | 6093 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 196 | 1107 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 52 | 3406 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 468 | 442 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 237 | 697 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 67 | 2234 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 351 | 477 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 16 | 5333 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 20 | 1949 |
| 2131 | Open Cup | Later is better than never | 5 | 3566 |
| 2137 | Dynamic string complexity | Later is better than never | 6 | 3343 |
