| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2741 | 171 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 934 | 502 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 380 | 1218 |
| 1297 | Palindrome | Spring School Contest 2004 | 5943 | 82 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3541 | 139 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2778 | 173 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1689 | 265 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 2198 | 190 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 236 | 1543 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1420 | 262 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 581 | 602 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 5831 | 61 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 36 | 6466 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 221 | 1148 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 59 | 3609 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 564 | 434 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 261 | 782 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 80 | 2353 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 466 | 445 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 17 | 6667 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 79 | 1165 |
| 2131 | Open Cup | Later is better than never | 10 | 4947 |
| 2137 | Dynamic string complexity | Later is better than never | 8 | 5496 |
