| 1930G | Prefix Max Set Counting | | | 3100 | 531 |
| 1929D | Sasha and a Walk in the City | | | 1900 | 5.9k |
| 1929E | Sasha and the Happy Tree Cutting | | | 2300 | 2.1k |
| 1926G | Vlad and Trouble at MIT | | | 1900 | 4.7k |
| 1923E | Count Paths | | | 2000 | 5.3k |
| 1917F | Construct Tree | | | 2500 | 1.3k |
| 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 |
| 1905E | One-X | | | 2400 | 1.3k |
| 1901E | Compressed Tree | | | 2200 | 2k |
| 1900C | Anji's Binary Tree | | | 1300 | 15.3k |
| 1889F | Doremy's Average Tree | | | 3500 | 208 |
| 1882D | Tree XOR | | | 1900 | 7.3k |
| 1881F | Minimum Maximum Distance | | | 1700 | 9.8k |
| 1876E | Ball-Stackable | | | 3300 | 373 |
| 1868C | Travel Plan | | | 2400 | 1.4k |
| 1866K | Keen Tree Calculation | | | 2500 | 585 |
| 1863H | Goldberg Machine 3 | | | 3500 | 116 |
| 1863I | Redundant Routes | | | 3500 | 133 |
| 1856E1 | PermuTree (easy version) | | | 1800 | 6.6k |
| 1856E2 | PermuTree (hard version) | | | 2700 | 1.8k |
| 1843D | Apple Tree | | | 1200 | 22.3k |
| 1843F1 | Omsk Metro (simple version) | | | 1800 | 6.5k |
| 1843F2 | Omsk Metro (hard version) | | | 2300 | 2.2k |
| 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 |
| 1824C | LuoTianyi and XOR-Tree | | | 2500 | 1.7k |
| 1823F | Random Walk | | | 2600 | 1.4k |
| 1822F | Gardening Friends | | | 1700 | 7.8k |
| 1819C | The Fox and the Complete Tree Traversal | | | 2400 | 1.8k |
| 1805D | A Wide, Wide Graph | | | 1800 | 9.6k |
| 1805E | There Should Be a Lot of Maximums | | | 2300 | 2k |
| 1797D | Li Hua and Tree | | | 1900 | 4.7k |
| 1796E | Colored Subgraphs | | | 2500 | 1.1k |
| 1794E | Labeling the Tree with Distances | | | 2400 | 1.6k |
| 1781F | Bracket Insertion | | | 2700 | 1.4k |
| 1779F | Xorcerer's Stones | | | 2500 | 1.5k |
| 1778F | Maximizing Root | | | 2600 | 964 |
| 1777D | Score of a Tree | | | 1900 | 4.9k |
| 1776M | Parmigiana With Seafood | | | 3000 | 514 |
| 1774E | Two Chess Pieces | | | 1900 | 4k |
| 1774G | Segment Covering | | | 3200 | 692 |
| 1771D | Hossam and (sub-)palindromic tree | | | 2100 | 3.3k |
| 1770E | Koxia and Tree | | | 2400 | 1.6k |
| 1767E | Algebra Flash | | | 2500 | 1.3k |
| 1763F | Edge Queries | | | 3000 | 750 |
| 1748E | Yet Another Array Counting Problem | | | 2300 | 2.8k |
| 1746D | Paths on the Tree | | | 1900 | 5.2k |
| 1740E | Hanging Hearts | | | 1800 | 5.1k |
| 1725E | Electrical Efficiency | | | 2500 | 640 |
| 1725J | Journey | | | 2500 | 503 |
| 1721E | Prefix Function Queries | | | 2200 | 2.7k |
| 1720D1 | Xor-Subsequence (easy version) | | | 1800 | 6.8k |
| 1720D2 | Xor-Subsequence (hard version) | | | 2400 | 2.3k |
| 1709F | Multiset of Strings | | | 2500 | 729 |
| 1707D | Partial Virtual Trees | | | 3000 | 997 |
| 1695D1 | Tree Queries (Easy Version) | | | 2200 | 2.5k |
| 1695D2 | Tree Queries (Hard Version) | | | 2300 | 2.3k |
| 1693B | Fake Plastic Trees | | | 1700 | 9.7k |
| 1691F | K-Set Tree | | | 2500 | 1.2k |
| 1689C | Infected Tree | | | 1600 | 13.9k |
| 1681F | Unique Occurrences | | | 2300 | 2.4k |
| 1676G | White-Black Balanced Subtrees | | | 1300 | 25.6k |
| 1675F | Vlad and Unfinished Business | | | 1800 | 6.4k |
| 1671E | Preorder | | | 2100 | 3.3k |
| 1667D | Edge Elimination | | | 2900 | 846 |
| 1666J | Job Lookup | | | 2100 | 1.6k |
| 1662G | Gastronomic Event | | | unrated | 574 |
| 1661E | Narrow Components | | | 2500 | 1.2k |
| 1646D | Weight the Tree | | | 2000 | 4.5k |
| 1637F | Towers | | | 2500 | 2.2k |
| 1625E1 | Cats on the Upgrade (easy version) | | | 2500 | 1.2k |
| 1617E | Christmas Chocolates | | | 2700 | 1.1k |
| 1611E2 | Escape The Maze (hard version) | | | 1900 | 4.4k |
| 1606F | Tree Queries | | | 2800 | 781 |
| 1594E2 | Rubik's Cube Coloring (hard version) | | | 2300 | 1.7k |
| 1592C | Bakry and Partitioning | | | 1700 | 9.3k |
| 1585G | Poachers | | | 2500 | 339 |
| 1580B | Mathematics Curriculum | | | 2600 | 1.4k |
| 1580D | Subsequence | | | 2900 | 1.2k |
| 1566E | Buds Re-hanging | | | 2000 | 4.5k |
| 1551F | Equidistant Vertices | | | 2200 | 2.2k |
| 1547G | How Many Paths? | | | 2100 | 3.7k |
| 1540B | Tree Array | | | 2300 | 3.1k |
| 1535D | Playoff Tournament | | | 1800 | 8.6k |
| 1535E | Gold Transfer | | | 2200 | 3.1k |
| 1534H | Lost Nodes | | | 3500 | 314 |
| 1528A | Parsa's Humongous Tree | | | 1600 | 19.8k |
| 1528E | Mashtali and Hagh Trees | | | 2900 | 640 |
| 1521D | Nastia Plays with a Tree | | | 2500 | 2.4k |
| 1517F | Reunion | | | 3200 | 702 |
| 1499F | Diameter Cuts | | | 2400 | 1.7k |
| 1498F | Christmas Game | | | 2500 | 1.1k |
| 1495F | Squares | | | 3300 | 533 |
| 1486F | Pairs of Paths | | | 2600 | 875 |
| 1485E | Move and Swap | | | 2500 | 1.6k |