| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2681 | 171 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 919 | 499 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 363 | 1246 |
| 1297 | Palindrome | Spring School Contest 2004 | 5774 | 83 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3461 | 139 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2701 | 174 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1587 | 276 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1990 | 204 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 224 | 1570 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1372 | 263 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 568 | 593 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5600 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 35 | 6304 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 212 | 1130 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 55 | 3605 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 544 | 423 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 253 | 747 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 76 | 2283 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 389 | 492 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 6072 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 58 | 1266 |
| 2131 | Open Cup | Later is better than never | 8 | 4516 |
| 2137 | Dynamic string complexity | Later is better than never | 8 | 4516 |
