| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2835 | 168 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 951 | 501 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 383 | 1227 |
| 1297 | Palindrome | Spring School Contest 2004 | 6042 | 82 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3593 | 139 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2831 | 172 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1785 | 255 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 2253 | 189 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 241 | 1546 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1456 | 262 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 587 | 610 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5925 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 36 | 6675 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 227 | 1161 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 59 | 3758 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 606 | 421 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 265 | 809 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 80 | 2473 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 495 | 441 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 7083 |
| 2118 | Cipher Message 4 | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 80 | 1288 |
| 2131 | Open Cup | Later is better than never | 10 | 5564 |
| 2137 | Dynamic string complexity | Later is better than never | 9 | 5857 |
