| 1297 | Palindrome | Spring School Contest 2004 | 5233 | 86 |
| 1723 | Sandro's Book | Ural Regional School Programming Contest 2009 | 4905 | 63 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3010 | 152 |
| 1423 | String Tale | Timus Top Coders: First Challenge | 2458 | 181 |
| 1102 | Strange Dialog | Tetrahedron Team Online Contest May 2001 | 2457 | 176 |
| 1590 | Bacon’s Cipher | NEERC 2007 Eastern Subregional | 1710 | 221 |
| 1517 | Freedom of Choice | Timus Top Coders: Third Challenge | 1385 | 296 |
| 1684 | Jack's Last Word | USU Personal Contest 2009 | 1246 | 264 |
| 1158 | Censored! | NEERC 2001 Northern Subregional | 859 | 503 |
| 1713 | Key Substrings | NEERC 2009 Eastern Subregional | 523 | 583 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 435 | 443 |
| 1177 | Like Comparisons | USU Personal Contest 2002 | 322 | 1321 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 316 | 482 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 221 | 680 |
| 1937 | Davy Jones’s Organ | Ural FU Championship 2012 | 189 | 1076 |
| 1677 | Monkey at the Keyboard | Petrozavodsk Summer 2008. USU Contest | 183 | 1743 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 58 | 2310 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 45 | 3580 |
| 1842 | Local Roots | Petrozavodsk Summer 2010. USU Contest | 32 | 5921 |
| 2077 | Reductions | Qualification of Eastern Subregional 2015 | 14 | 5129 |
| 2118 | Ciphertext | Petrozavodsk Summer 2018. t.me/umnik_team Contest | 8 | 2304 |
| 2137 | Dynamic string complexity | Later is better than never | 3 | 2800 |
| 2131 | Open Cup | Later is better than never | 1 | 3310 |
