| 2249D | Xor Permutation Matrix | | | unrated | 672 |
| 2246E | lce4113 and Security Game | | | unrated | 539 |
| 2245C | MEXOR | | | unrated | 6k |
| 2242E | Product of Closures | | | 2200 | 1.4k |
| 2234D | XOR, Expression and Two Binary Numbers | | | 1500 | 8.6k |
| 2225D | Exceptional Segments | | | 1500 | 8.3k |
| 2217F | Interval Game | | | 2300 | 885 |
| 2211D | AND-array | | | 1900 | 3.2k |
| 2205G | Simons and Diophantus Equation | | | 3000 | 231 |
| 2203B | Beautiful Numbers | | | 1000 | 16.2k |
| 2203C | Test Generator | | | 1500 | 7.9k |
| 2194C | Secret message | | | 1300 | 11.6k |
| 2189C1 | XOR Convenience (Easy Version) | | | 1300 | 14.7k |
| 2189C2 | XOR-convenience (Hard Version) | | | 1800 | 6.5k |
| 2187D | Cool Problem | | | 2600 | 707 |
| 2182F1 | Christmas Reindeer (easy version) | | | 2300 | 1.3k |
| 2182F2 | Christmas Reindeer (hard version) | | | 2500 | 1.1k |
| 2180E | No Effect XOR | | | 2300 | 1.8k |
| 2180G | Balance | | | 3500 | 154 |
| 2179D | Blackslex and Penguin Civilization | | | 1300 | 14.1k |
| 2179H | Blackslex and Plants | | | 2200 | 1.4k |
| 2176F | Omega Numbers | | | 2400 | 1.6k |
| 2173D | Taiga's Carry Chains | | | 1900 | 3.8k |
| 2171G | Sakura Adachi and Optimal Sequences | | | 2000 | 2.4k |
| 2170A | Maximum Neighborhood | | | 800 | 20.6k |
| 2168A2 | Encode and Decode (Hard Version) | | | unrated | 3.5k |
| 2165C | Binary Wine | | | 2000 | 5k |
| 2157G | Isaac's Queries | | | 2800 | 672 |
| 2143F | Increasing Xor | | | 2700 | 454 |
| 2135C | By the Assignment | | | 2000 | 5.4k |
| 2131G | Wafu! | | | 2000 | 3.9k |
| 2127G2 | Inter Active (Hard Version) | | | 3500 | 126 |
| 2125C | Count Good Numbers | | | 1100 | 23.3k |
| 2119A | Add or XOR | | | 800 | 27.7k |
| 2119C | A Good Problem | | | 1300 | 16.8k |
| 2118C | Make It Beautiful | | | 1300 | 19k |
| 2115D | Gellyfish and Forget-Me-Not | | | 2900 | 2.1k |
| 2109B | Slice to Survive | | | 1200 | 17.8k |
| 2109C1 | Hacking Numbers (Easy Version) | | | 1500 | 11.8k |
| 2108B | SUMdamental Decomposition | | | 1300 | 14.9k |
| 2097D | Homework | | | 2800 | 559 |
| 2096H | Wonderful XOR Problem | | | 3200 | 235 |
| 2086E | Zebra-like Numbers | | | 2400 | 1.7k |
| 2081A | Math Division | | | 1800 | 4.2k |
| 2077B | Finding OR Sum | | | 1900 | 3.7k |
| 2075D | Equalization | | | 2000 | 6k |
| 2075E | XOR Matrix | | | 2500 | 1.2k |
| 2074F | Counting Necessary Nodes | | | 2000 | 2.5k |
| 2072F | Goodbye, Banker Life | | | 1700 | 8.7k |
| 2071D1 | Infinite Sequence (Easy Version) | | | 1800 | 6.9k |
| 2071D2 | Infinite Sequence (Hard Version) | | | 2500 | 1.1k |
| 2066C | Bitwise Slides | | | 2300 | 2.6k |
| 2061E | Kevin and And | | | 2000 | 4.1k |
| 2057C | Trip to the Olympiad | | | 1500 | 14.1k |
| 2056F1 | Xor of Median (Easy Version) | | | 2700 | 455 |
| 2056F2 | Xor of Median (Hard Version) | | | 3000 | 362 |
| 2053C | Bewitching Stargazer | | | 1500 | 12.6k |
| 2048I2 | Kevin and Puzzle (Hard Version) | | | 3500 | 68 |
| 2040C | Ordered Permutations | | | 1600 | 11k |
| 2039C1 | Shohag Loves XOR (Easy Version) | | | 1200 | 13.8k |
| 2039C2 | Shohag Loves XOR (Hard Version) | | | 1800 | 5.1k |
| 2037G | Natlan Exploring | | | 2000 | 3.9k |
| 2035C | Alya and Permutation | | | 1400 | 11.8k |
| 2027E1 | Bit Game (Easy Version) | | | 2800 | 270 |
| 2027E2 | Bit Game (Hard Version) | | | 3100 | 111 |
| 2020A | Find Minimum Operations | | | 800 | 26.2k |
| 2020C | Bitwise Balancing | | | 1400 | 18.7k |
| 2020E | Expected Power | | | 2000 | 4.1k |
| 2009F | Firefly's Queries | | | 1700 | 8.7k |
| 1994B | Fun Game | | | 1100 | 19.8k |
| 1994E | Wooden Game | | | 2000 | 5.7k |
| 1994G | Minecraft | | | 2600 | 1.7k |
| 1991D | Prime XOR Coloring | | | 1900 | 8k |
| 1991H | Prime Split Game | | | 3300 | 580 |
| 1982E | Number of k-good subarrays | | | 2300 | 1.9k |
| 1981B | Turtle and an Infinite Sequence | | | 1300 | 16.7k |
| 1981C | Turtle and an Incomplete Sequence | | | 1800 | 6.4k |
| 1977B | Binary Colouring | | | 1100 | 20.1k |
| 1975F | Set | | | 2600 | 1.1k |
| 1973B | Cat, Fox and the Lonely Array | | | 1300 | 17.1k |
| 1967C | Fenwick Tree | | | 2300 | 2.3k |
| 1957D | A BIT of an Inequality | | | 1900 | 6k |
| 1956D | Nene and the Mex Operator | | | 2000 | 4.9k |
| 1936A | Bitwise Operation Wizard | | | 1700 | 8.8k |
| 1935E | Distance Learning Courses in MAC | | | 2400 | 1.7k |
| 1933G | Turtle Magic: Royal Turtle Shell Pattern | | | 2300 | 1.2k |
| 1929E | Sasha and the Happy Tree Cutting | | | 2300 | 2.1k |
| 1926E | Vlad and an Odd Ordering | | | 1500 | 15.2k |
| 1922E | Increasing Subsequences | | | 1800 | 9.3k |
| 1918C | XOR-distance | | | 1400 | 17.1k |
| 1909B | Make Almost Equal With Mod | | | 1200 | 33.3k |
| 1909E | Multiple Lamps | | | 2400 | 1.7k |
| 1900D | Small GCD | | | 2000 | 5.6k |
| 1895D | XOR Construction | | | 1900 | 7.2k |
| 1886E | I Wanna be the Team Leader | | | 2400 | 1.9k |
| 1879D | Sum of XOR Functions | | | 1700 | 11.1k |
| 1875C | Jellyfish and Green Apple | | | 1400 | 14.1k |
| 1870B | Friendly Arrays | | | 1200 | 16.5k |
| 1868B1 | Candy Party (Easy Version) | | | 1700 | 8.4k |
| 1868B2 | Candy Party (Hard Version) | | | 2100 | 2.8k |