| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2617 | 171 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 892 | 501 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 335 | 1315 |
| 1297 | Palindrome | Spring School Contest 2004 | 5568 | 84 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3229 | 146 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2620 | 176 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1514 | 281 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1847 | 213 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 214 | 1580 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1339 | 259 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 556 | 581 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5370 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 33 | 6246 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 202 | 1108 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 54 | 3409 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 496 | 431 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 244 | 706 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 73 | 2161 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 367 | 476 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 5419 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 22 | 2089 |
| 2131 | Open Cup | Later is better than never | 7 | 3642 |
| 2137 | Dynamic string complexity | Later is better than never | 7 | 3641 |
