| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2641 | 170 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 900 | 500 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 338 | 1312 |
| 1297 | Palindrome | Spring School Contest 2004 | 5642 | 83 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3258 | 146 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2650 | 175 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1529 | 280 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1864 | 213 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 216 | 1581 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1345 | 260 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 556 | 588 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5425 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 34 | 6192 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 205 | 1112 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 54 | 3473 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 508 | 429 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 247 | 715 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 75 | 2162 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 369 | 485 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 5586 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 22 | 2243 |
| 2131 | Open Cup | Later is better than never | 7 | 3933 |
| 2137 | Dynamic string complexity | Later is better than never | 8 | 3714 |
