| 1547B | Alphabetical Strings | | | 800 | 28.1k |
| 1539B | Love Song | | | 800 | 26.9k |
| 1538E | Funny Substrings | | | 2100 | 3.3k |
| 1537E1 | Erase and Extend (Easy Version) | | | 1600 | 16.9k |
| 1535C | Unstable String | | | 1400 | 17.9k |
| 1535F | String Distance | | | 3000 | 701 |
| 1512C | A-B Palindrome | | | 1200 | 22k |
| 1508A | Binary Literature | | | 1900 | 6.7k |
| 1506C | Double-ended Strings | | | 1000 | 37.6k |
| 1473D | Program | | | 1700 | 11.1k |
| 1462B | Last Year's Substring | | | 800 | 29.4k |
| 1451B | Non-Substring Subsequence | | | 900 | 20.3k |
| 1451C | String Equality | | | 1400 | 17.4k |
| 1422E | Minlexes | | | 2700 | 912 |
| 1411D | Grime Zoo | | | 2100 | 2.8k |
| 1404A | Balanced Bitstring | | | 1500 | 20.1k |
| 1393E1 | Twilight and Ancient Scroll (easier version) | | | 2800 | 483 |
| 1393E2 | Twilight and Ancient Scroll (harder version) | | | 3200 | 522 |
| 1381A2 | Prefix Flip (Hard Version) | | | 1700 | 14.5k |
| 1379A | Acacius and String | | | 1500 | 12.4k |
| 1369B | AccurateLee | | | 1200 | 25.7k |
| 1367A | Short Substrings | | | 800 | 68.8k |
| 1363B | Subsequence Hate | | | 1400 | 26.5k |
| 1332C | K-Complete Word | | | 1500 | 21.7k |
| 1316B | String Modification | | | 1400 | 11.8k |
| 1304B | Longest Palindrome | | | 1100 | 18.9k |
| 1303A | Erasing Zeroes | | | 800 | 37.3k |
| 1301A | Three Strings | | | 800 | 20.2k |
| 1284A | New Year and Naming | | | 800 | 18.6k |
| 1278A | Shuffle Hashing | | | 1000 | 18.5k |
| 1268A | Long Beautiful Integer | | | 1700 | 9.2k |
| 1257C | Dominated Subarray | | | 1200 | 17.4k |
| 1220A | Cards | | | 800 | 33.1k |
| 1219C | Periodic integer number | | | 1700 | 2.5k |
| 1213F | Unstable String Sort | | | 2100 | 3.1k |
| 1211F | kotlinkotlinkotlinkotlin... | | | 2300 | 153 |
| 1202C | You Are Given a WASD-string... | | | 2100 | 2.8k |
| 1201A | Important Exam | | | 900 | 17.1k |
| 1200E | Compress Words | | | 2000 | 9.7k |
| 1194C | From S To T | | | 1300 | 14.7k |
| 1187B | Letters Shop | | | 1300 | 12.9k |
| 1185B | Email from Polycarp | | | 1200 | 14.3k |
| 1182B | Plus from Picture | | | 1300 | 12.1k |
| 1181B | Split a Number | | | 1500 | 6.7k |
| 1170C | Minus and Minus Give Plus | | | unrated | 836 |
| 1156B | Ugly Pairs | | | 1800 | 6.6k |
| 1155A | Reverse a Substring | | | 1000 | 27.8k |
| 1149B | Three Religions | | | 2200 | 2.1k |
| 1146A | Love "A" | | | 800 | 23.8k |
| 1146B | Hate "A" | | | 1100 | 9.4k |
| 1144A | Diverse Strings | | | 800 | 22.2k |
| 1140B | Good String | | | 1200 | 11.8k |
| 1139A | Even Substrings | | | 800 | 17.7k |
| 1111A | Superhero Transformation | | | 1000 | 18.2k |
| 1105B | Zuhair and Strings | | | 1100 | 10.6k |
| 1085A | Right-Left Cipher | | | 800 | 12.7k |
| 1085E | Vasya and Templates | | | 2300 | 1.2k |
| 1073A | Diverse Substring | | | 1000 | 17.3k |
| 1055D | Refactoring | | | 2400 | 674 |
| 1051A | Vasya And Password | | | 1200 | 8.9k |
| 1038A | Equality | | | 800 | 15.7k |
| 1029A | Many Equal Substrings | | | 1300 | 13.6k |
| 1027A | Palindromic Twist | | | 1000 | 19.2k |
| 1023A | Single Wildcard Pattern Matching | | | 1200 | 9.4k |
| 1008A | Romaji | | | 900 | 16.5k |
| 1005B | Delete from the Left | | | 900 | 27.8k |
| 989A | A Blend of Springtime | | | 900 | 11.2k |
| 981A | Antipalindrome | | | 900 | 10.4k |
| 977B | Two-gram | | | 900 | 51.1k |
| 975A | Aramic script | | | 900 | 10.4k |
| 954B | String Typing | | | 1400 | 7.9k |
| 940C | Phone Numbers | | | 1500 | 6.8k |
| 936C | Lock Puzzle | | | 2300 | 1.3k |
| 930B | Game with String | | | 1600 | 3.2k |
| 923D | Picking Strings | | | 2500 | 1.5k |
| 918B | Radio Station | | | 900 | 20.4k |
| 906A | Shockers | | | 1600 | 4.4k |
| 903E | Swapping Characters | | | 2200 | 1.6k |
| 898C | Phone Numbers | | | 1400 | 5.9k |
| 883E | Field of Wonders | | | 1500 | 2.1k |
| 883H | Palindromic Cut | | | 1800 | 1.8k |
| 877A | Alex and broken contest | | | 1100 | 11.6k |
| 868A | Bark to Unlock | | | 900 | 10.1k |
| 868D | Huge Strings | | | 2200 | 1k |
| 864B | Polycarp and Letters | | | 1000 | 10.1k |
| 855A | Tom Riddle's Diary | | | 800 | 28.2k |
| 844A | Diversity | | | 1000 | 12.3k |
| 832B | Petya and Exam | | | 1600 | 4.7k |
| 831B | Keyboard Layouts | | | 800 | 15.8k |
| 822B | Crossword solving | | | 1000 | 10.3k |
| 802G1 | Fake News (easy) | | | 800 | 8.3k |
| 785A | Anton and Polyhedrons | | | 800 | 113.9k |
| 780D | Innokenty and a Football League | | | 1900 | 3.1k |
| 777D | Cloud of Hashtags | | | 1800 | 5.3k |
| 776A | A Serial Killer | | | 900 | 13k |
| 774K | Stepan and Vowels | | | 1600 | 1.4k |
| 765B | Code obfuscation | | | 1100 | 7.6k |
| 754C | Vladik and chat | | | 2200 | 1.1k |
| 748B | Santa Claus and Keyboard Check | | | 1500 | 5.7k |
| 747B | Mammoth's Genome Decoding | | | 900 | 9.7k |