| 1266A | Competitive Programmer | | | 1000 | 17.8k |
| 1266B | Dice Tower | | | 1000 | 16.7k |
| 1266C | Diverse Matrix | | | 1400 | 10.1k |
| 1266D | Decreasing Debts | | | 2000 | 3.9k |
| 1266E | Spaceship Solitaire | | | 2100 | 2.5k |
| 1266F | Almost Same Distance | | | 2900 | 417 |
| 1266G | Permutation Concatenation | | | 3300 | 142 |
| 1266H | Red-Blue Graph | | | 3400 | 144 |
| 1265A | Beautiful String | | | 1000 | 16k |
| 1265B | Beautiful Numbers | | | 1300 | 13.7k |
| 1265E | Beautiful Mirrors | | | 2100 | 4.7k |
| 1264A | Beautiful Regional Contest | | | 1500 | 10.5k |
| 1264B | Beautiful Sequence | | | 1900 | 6.1k |
| 1264C | Beautiful Mirrors with queries | | | 2400 | 1.4k |
| 1264D1 | Beautiful Bracket Sequence (easy version) | | | 2600 | 1.6k |
| 1264D2 | Beautiful Bracket Sequence (hard version) | | | 2900 | 1.5k |
| 1264E | Beautiful League | | | 2700 | 964 |
| 1264F | Beautiful Fibonacci Problem | | | 3500 | 1.1k |
| 1263A | Sweet Problem | | | 1100 | 17.4k |
| 1263B | PIN Codes | | | 1400 | 11.8k |
| 1263C | Everyone is a Winner! | | | 1400 | 14.7k |
| 1263D | Secret Passwords | | | 1500 | 16.6k |
| 1263E | Editor | | | 2100 | 3.1k |
| 1263F | Economic Difficulties | | | 2400 | 982 |
| 1261F | Xor-Set | | | 3100 | 515 |
| 1260A | Heating | | | 1000 | 16k |
| 1260B | Obtain Two Zeroes | | | 1300 | 16.9k |
| 1260C | Infinite Fence | | | 1700 | 8.9k |
| 1260D | A Game with Traps | | | 1900 | 4.3k |
| 1260E | Tournament | | | 2400 | 2k |
| 1260F | Colored Tree | | | 2700 | 681 |
| 1257A | Two Rival Students | | | 800 | 21.7k |
| 1257B | Magic Stick | | | 1000 | 22.7k |
| 1257C | Dominated Subarray | | | 1200 | 17.4k |
| 1257D | Yet Another Monster Killing Problem | | | 1700 | 8.2k |
| 1257E | The Contest | | | 2000 | 4.7k |
| 1257F | Make Them Similar | | | 2400 | 2.4k |
| 1257G | Divisor Set | | | 2600 | 798 |
| 1256A | Payment Without Change | | | 1000 | 32.7k |
| 1256B | Minimize the Permutation | | | 1400 | 13.8k |
| 1256C | Platforms Jumping | | | 1700 | 7.4k |
| 1256D | Binary String Minimizing | | | 1500 | 12.9k |
| 1256E | Yet Another Division Into Teams | | | 2000 | 4.8k |
| 1256F | Equalizing Two Strings | | | 2000 | 3.7k |
| 1255A | Changing Volume | | | 800 | 18.1k |
| 1255B | Fridge Lockers | | | 1100 | 12.7k |
| 1255C | League of Leesins | | | 1600 | 7.3k |
| 1254A | Feeding Chicken | | | 1700 | 5.8k |
| 1254B1 | Send Boxes to Alice (Easy Version) | | | 1800 | 5.1k |
| 1254B2 | Send Boxes to Alice (Hard Version) | | | 2100 | 3.6k |
| 1254C | Point Ordering | | | 2300 | 1.8k |
| 1254D | Tree Queries | | | 2700 | 1.7k |
| 1254E | Send Tree to Charlie | | | 3300 | 460 |
| 1253A | Single Push | | | 1000 | 19.5k |
| 1253B | Silly Mistake | | | 1400 | 11.8k |
| 1253C | Sweets Eating | | | 1500 | 15.6k |
| 1253D | Harmonious Graph | | | 1700 | 10.5k |
| 1253E | Antenna Coverage | | | 2200 | 3.2k |
| 1253F | Cheap Robot | | | 2500 | 2.4k |
| 1252A | Copying Homework | | | 1000 | 6.1k |
| 1252B | Cleaning Robots | | | 2300 | 613 |
| 1252C | Even Path | | | 1600 | 4k |
| 1252D | Find String in a Grid | | | 3000 | 496 |
| 1252E | Songwriter | | | 2200 | 1.4k |
| 1252F | Regular Forestation | | | 2400 | 1.1k |
| 1252G | Performance Review | | | 2100 | 1.6k |
| 1252H | Twin Buildings | | | 1800 | 2.9k |
| 1252I | Mission Possible | | | 3000 | 58 |
| 1252J | Tiling Terrace | | | 2300 | 812 |
| 1252K | Addition Robot | | | 2100 | 2.1k |
| 1252L | Road Construction | | | 2300 | 669 |
| 1251A | Broken Keyboard | | | 1000 | 21.7k |
| 1251B | Binary Palindromes | | | 1400 | 11.7k |
| 1251C | Minimize The Integer | | | 1600 | 14.7k |
| 1251D | Salary Changing | | | 1900 | 6.7k |
| 1251E1 | Voting (Easy Version) | | | 2300 | 2.6k |
| 1251E2 | Voting (Hard Version) | | | 2400 | 3k |
| 1251F | Red-White Fence | | | 2500 | 1.1k |
| 1250A | Berstagram | | | 1400 | 4.4k |
| 1250B | The Feast and the Bus | | | 1800 | 2.8k |
| 1250C | Trip to Saint Petersburg | | | 2100 | 1.5k |
| 1250D | Conference Problem | | | 3000 | 254 |
| 1250E | The Coronation | | | 2300 | 936 |
| 1250F | Data Center | | | 800 | 8.4k |
| 1250G | Discarding Game | | | 2300 | 804 |
| 1250H | Happy Birthday | | | 1500 | 4.3k |
| 1250I | Show Must Go On | | | 3100 | 231 |
| 1250J | The Parade | | | 1800 | 3.4k |
| 1250K | Projectors | | | 3100 | 410 |
| 1250L | Divide The Students | | | 1500 | 4.7k |
| 1250M | SmartGarden | | | 2500 | 399 |
| 1250N | Wires | | | 2000 | 1.8k |
| 1249A | Yet Another Dividing into Teams | | | 800 | 23.8k |
| 1249B1 | Books Exchange (easy version) | | | 1000 | 22.5k |
| 1249B2 | Books Exchange (hard version) | | | 1300 | 18.6k |
| 1249C1 | Good Numbers (easy version) | | | 1300 | 16.7k |
| 1249C2 | Good Numbers (hard version) | | | 1500 | 13.6k |
| 1249D1 | Too Many Segments (easy version) | | | 1800 | 5.6k |
| 1249D2 | Too Many Segments (hard version) | | | 1800 | 5.9k |
| 1249E | By Elevator or Stairs? | | | 1700 | 11.3k |