| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2528 | 174 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 873 | 504 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 329 | 1317 |
| 1297 | Palindrome | Spring School Contest 2004 | 5361 | 86 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3099 | 150 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2520 | 180 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1452 | 288 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1776 | 217 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 197 | 1669 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1286 | 263 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 539 | 583 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5096 | 63 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 33 | 6021 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 193 | 1108 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 52 | 3352 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 455 | 447 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 228 | 708 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 63 | 2309 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 331 | 494 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 15 | 5402 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 14 | 2272 |
| 2131 | Open Cup | Later is better than never | 4 | 3537 |
| 2137 | Dynamic string complexity | Later is better than never | 5 | 3301 |
