| 1943C | Tree Compass | | | 2300 | 2.7k |
| 1942H | Farmer John's Favorite Intern | | | 3500 | 262 |
| 1940C | Burenka and Pether | | | unrated | 44 |
| 1939B | Evidence Board | | | unrated | 308 |
| 1935F | Andrey's Tree | | | 2800 | 634 |
| 1930G | Prefix Max Set Counting | | | 3100 | 531 |
| 1930H | Interactive Mex Tree | | | 3300 | 379 |
| 1929D | Sasha and a Walk in the City | | | 1900 | 5.9k |
| 1929E | Sasha and the Happy Tree Cutting | | | 2300 | 2.1k |
| 1929F | Sasha and the Wedding Binary Search Tree | | | 2300 | 2.4k |
| 1927F | Microcycle | | | 1900 | 5.6k |
| 1926G | Vlad and Trouble at MIT | | | 1900 | 4.7k |
| 1923E | Count Paths | | | 2000 | 5.3k |
| 1920F2 | Smooth Sailing (Hard Version) | | | 3000 | 668 |
| 1919D | 01 Tree | | | 2100 | 4.6k |
| 1919G | Tree LGM | | | 3500 | 219 |
| 1919H | Tree Diameter | | | 2000 | 185 |
| 1918F | Caterpillar on a Tree | | | 2500 | 1.2k |
| 1917F | Construct Tree | | | 2500 | 1.3k |
| 1916E | Happy Life in University | | | 2300 | 2.7k |
| 1916G | Optimizations From Chelsu | | | 3500 | 239 |
| 1914F | Programming Competition | | | 1900 | 5.1k |
| 1914G1 | Light Bulbs (Easy Version) | | | 2100 | 2.5k |
| 1913D | Array Collapse | | | 2100 | 4.3k |
| 1910F | Build Railway Stations | | | 2000 | 227 |
| 1905B | Begginer's Zelda | | | 1100 | 18.9k |
| 1905E | One-X | | | 2400 | 1.3k |
| 1904E | Tree Queries | | | 2500 | 1.4k |
| 1904F | Beautiful Tree | | | 2800 | 581 |
| 1903F | Babysitting | | | 2500 | 976 |
| 1902E | Collapsing Strings | | | 1900 | 5.9k |
| 1902F | Trees and XOR Queries Again | | | 2400 | 1.5k |
| 1901E | Compressed Tree | | | 2200 | 2k |
| 1900C | Anji's Binary Tree | | | 1300 | 15.3k |
| 1899F | Alex's whims | | | 1600 | 9.7k |
| 1899G | Unusual Entertainment | | | 1900 | 4.1k |
| 1895D | XOR Construction | | | 1900 | 7.2k |
| 1891F | A Growing Tree | | | 2000 | 4.9k |
| 1889D | Game of Stacks | | | 3000 | 982 |
| 1889E | Doremy's Swapping Trees | | | 3500 | 184 |
| 1889F | Doremy's Average Tree | | | 3500 | 208 |
| 1887D | Split | | | 2700 | 1.3k |
| 1882D | Tree XOR | | | 1900 | 7.3k |
| 1881F | Minimum Maximum Distance | | | 1700 | 9.8k |
| 1879E | Interactive Game with Coloring | | | 2400 | 1.6k |
| 1878G | wxhtzdy ORO Tree | | | 2300 | 1.5k |
| 1876E | Ball-Stackable | | | 3300 | 373 |
| 1876G | Clubstep | | | 3500 | 295 |
| 1873H | Mad City | | | 1700 | 9.7k |
| 1870H | Standard Graph Problem | | | 3500 | 127 |
| 1868C | Travel Plan | | | 2400 | 1.4k |
| 1868D | Flower-like Pseudotree | | | 3000 | 418 |
| 1866K | Keen Tree Calculation | | | 2500 | 585 |
| 1864E | Guess Game | | | 2100 | 3.1k |
| 1863H | Goldberg Machine 3 | | | 3500 | 116 |
| 1863I | Redundant Routes | | | 3500 | 133 |
| 1861C | Queries for the Array | | | 1600 | 12.5k |
| 1859F | Teleportation in Byteland | | | 3200 | 582 |
| 1858E1 | Rollbacks (Easy Version) | | | 2500 | 1.7k |
| 1858E2 | Rollbacks (Hard Version) | | | 2600 | 1.3k |
| 1857D | Strong Vertices | | | 1300 | 31k |
| 1857G | Counting Graphs | | | 2000 | 5.6k |
| 1856E1 | PermuTree (easy version) | | | 1800 | 6.6k |
| 1856E2 | PermuTree (hard version) | | | 2700 | 1.8k |
| 1854D | Michael and Hotel | | | 3000 | 695 |
| 1851F | Lisa and the Martians | | | 1800 | 7.8k |
| 1851G | Vlad and the Mountains | | | 2000 | 4.2k |
| 1849F | XOR Partition | | | 2700 | 911 |
| 1844G | Tree Weights | | | 3000 | 1.2k |
| 1843C | Sum in Binary Tree | | | 800 | 40.3k |
| 1843D | Apple Tree | | | 1200 | 22.3k |
| 1843F1 | Omsk Metro (simple version) | | | 1800 | 6.5k |
| 1843F2 | Omsk Metro (hard version) | | | 2300 | 2.2k |
| 1842F | Tenzing and Tree | | | 2500 | 1.9k |
| 1837E | Playoff Fixing | | | 2200 | 2.6k |
| 1833G | Ksyusha and Chinchilla | | | 1800 | 6.5k |
| 1830A | Copil Copac Draws Trees | | | 1400 | 21.3k |
| 1830D | Mex Tree | | | 2800 | 956 |
| 1827B1 | Range Sorting (Easy Version) | | | 2000 | 4.6k |
| 1827D | Two Centroids | | | 2800 | 1k |
| 1827E | Bus Routes | | | 3400 | 1k |
| 1824B1 | LuoTianyi and the Floating Islands (Easy Version) | | | 1800 | 6.3k |
| 1824B2 | LuoTianyi and the Floating Islands (Hard Version) | | | 2300 | 3.6k |
| 1824C | LuoTianyi and XOR-Tree | | | 2500 | 1.7k |
| 1824E | LuoTianyi and Cartridge | | | 3500 | 196 |
| 1823F | Random Walk | | | 2600 | 1.4k |
| 1822F | Gardening Friends | | | 1700 | 7.8k |
| 1819C | The Fox and the Complete Tree Traversal | | | 2400 | 1.8k |
| 1819E | Roads in E City | | | 3200 | 384 |
| 1815B | Sum Graph | | | 2000 | 3.7k |
| 1810F | M-tree | | | 2800 | 701 |
| 1806E | Tree Master | | | 2200 | 3.5k |
| 1805D | A Wide, Wide Graph | | | 1800 | 9.6k |
| 1805E | There Should Be a Lot of Maximums | | | 2300 | 2k |
| 1801E | Gasoline prices | | | 3000 | 748 |
| 1800G | Symmetree | | | 2200 | 2.6k |
| 1797D | Li Hua and Tree | | | 1900 | 4.7k |
| 1797F | Li Hua and Path | | | 3000 | 666 |
| 1796E | Colored Subgraphs | | | 2500 | 1.1k |
| 1795F | Blocking Chips | | | 2400 | 1.4k |