| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2656 | 171 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 913 | 497 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 355 | 1260 |
| 1297 | Palindrome | Spring School Contest 2004 | 5717 | 83 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3280 | 146 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2671 | 175 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1558 | 277 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1887 | 213 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 220 | 1571 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1354 | 262 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 560 | 591 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5515 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 34 | 6294 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 207 | 1123 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 55 | 3494 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 530 | 421 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 249 | 729 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 76 | 2195 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 377 | 488 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 5781 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 24 | 2280 |
| 2131 | Open Cup | Later is better than never | 8 | 4036 |
| 2137 | Dynamic string complexity | Later is better than never | 8 | 4036 |
