| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2582 | 172 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 885 | 502 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 333 | 1314 |
| 1297 | Palindrome | Spring School Contest 2004 | 5514 | 84 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3197 | 147 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2583 | 177 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1497 | 282 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1822 | 215 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 211 | 1586 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1330 | 258 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 551 | 580 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5307 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 33 | 6156 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 197 | 1116 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 52 | 3452 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 480 | 437 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 239 | 703 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 70 | 2188 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 362 | 471 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 5252 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 22 | 1935 |
| 2131 | Open Cup | Later is better than never | 6 | 3560 |
| 2137 | Dynamic string complexity | Later is better than never | 7 | 3350 |
