| 1794E | Labeling the Tree with Distances | | | 2400 | 1.6k |
| 1790F | Timofey and Black-White Tree | | | 2100 | 4.2k |
| 1788F | XOR, Tree, and Queries | | | 2500 | 1.2k |
| 1787G | Colorful Tree Again | | | 3000 | 628 |
| 1783G | Weighed Tree Radius | | | 2800 | 625 |
| 1781F | Bracket Insertion | | | 2700 | 1.4k |
| 1781G | Diverse Coloring | | | 3200 | 298 |
| 1779F | Xorcerer's Stones | | | 2500 | 1.5k |
| 1778E | The Tree Has Fallen! | | | 2500 | 1.2k |
| 1778F | Maximizing Root | | | 2600 | 964 |
| 1777D | Score of a Tree | | | 1900 | 4.9k |
| 1777E | Edge Reverse | | | 2200 | 2.4k |
| 1777F | Comfortably Numb | | | 2400 | 1.5k |
| 1776M | Parmigiana With Seafood | | | 3000 | 514 |
| 1774E | Two Chess Pieces | | | 1900 | 4k |
| 1774G | Segment Covering | | | 3200 | 692 |
| 1773B | BinCoin | | | 2200 | 982 |
| 1771D | Hossam and (sub-)palindromic tree | | | 2100 | 3.3k |
| 1771F | Hossam and Range Minimum Query | | | 2500 | 1.7k |
| 1770E | Koxia and Tree | | | 2400 | 1.6k |
| 1767E | Algebra Flash | | | 2500 | 1.3k |
| 1767F | Two Subtrees | | | 3100 | 445 |
| 1764F | Doremy's Experimental Tree | | | 2500 | 1.3k |
| 1763F | Edge Queries | | | 3000 | 750 |
| 1762E | Tree Sum | | | 2600 | 899 |
| 1761E | Make It Connected | | | 2400 | 2.2k |
| 1761G | Centroid Guess | | | 3500 | 156 |
| 1749F | Distance to the Path | | | 2800 | 642 |
| 1748E | Yet Another Array Counting Problem | | | 2300 | 2.8k |
| 1746D | Paths on the Tree | | | 1900 | 5.2k |
| 1741D | Masha and a Beautiful Tree | | | 1300 | 18.7k |
| 1740E | Hanging Hearts | | | 1800 | 5.1k |
| 1740H | MEX Tree Manipulation | | | 3300 | 466 |
| 1739D | Reset K Edges | | | 1900 | 6.4k |
| 1738D | Permutation Addicts | | | 1900 | 3.8k |
| 1738F | Connectivity Addicts | | | 2400 | 1.4k |
| 1726D | Edge Split | | | 2000 | 4.2k |
| 1725E | Electrical Efficiency | | | 2500 | 640 |
| 1725I | Imitating the Key Tree | | | 2800 | 333 |
| 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 |
| 1718D | Permutation for Burenka | | | 3300 | 449 |
| 1714F | Build a Tree and That Is It | | | 1900 | 3.7k |
| 1714G | Path Prefixes | | | 1700 | 9.9k |
| 1712F | Triameter | | | 3200 | 508 |
| 1710D | Recover the Tree | | | 3400 | 565 |
| 1709E | XOR Tree | | | 2400 | 4.2k |
| 1709F | Multiset of Strings | | | 2500 | 729 |
| 1707C | DFS Trees | | | 2400 | 2k |
| 1707D | Partial Virtual Trees | | | 3000 | 997 |
| 1706E | Qpwoeirut and Vertices | | | 2300 | 4k |
| 1702G1 | Passable Paths (easy version) | | | 1900 | 6.5k |
| 1702G2 | Passable Paths (hard version) | | | 2000 | 6.1k |
| 1698E | PermutationForces II | | | 2300 | 1.9k |
| 1696F | Tree Recovery | | | 2600 | 1.2k |
| 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 |
| 1682D | Circular Spanning Tree | | | 2000 | 3.8k |
| 1682E | Unordered Swaps | | | 2700 | 777 |
| 1681F | Unique Occurrences | | | 2300 | 2.4k |
| 1680F | Lenient Vertex Cover | | | 2600 | 979 |
| 1676G | White-Black Balanced Subtrees | | | 1300 | 25.6k |
| 1675D | Vertical Paths | | | 1300 | 15.1k |
| 1675F | Vlad and Unfinished Business | | | 1800 | 6.4k |
| 1671E | Preorder | | | 2100 | 3.3k |
| 1670E | Hemose on the Tree | | | 2200 | 2k |
| 1667D | Edge Elimination | | | 2900 | 846 |
| 1666J | Job Lookup | | | 2100 | 1.6k |
| 1665C | Tree Infection | | | 1600 | 10k |
| 1663A | Who Tested? | | | unrated | 10.9k |
| 1662G | Gastronomic Event | | | unrated | 574 |
| 1661E | Narrow Components | | | 2500 | 1.2k |
| 1659F | Tree and Permutation Game | | | 3000 | 255 |
| 1657F | Words on Tree | | | 2600 | 854 |
| 1656E | Equal Tree Sums | | | 2200 | 3.9k |
| 1654D | Potion Brewing Class | | | 2100 | 3.1k |
| 1654G | Snowy Mountain | | | 2900 | 474 |
| 1648E | Air Reform | | | 3200 | 601 |
| 1646D | Weight the Tree | | | 2000 | 4.5k |
| 1637F | Towers | | | 2500 | 2.2k |
| 1633E | Spanning Tree Queries | | | 2400 | 1.8k |
| 1633F | Perfect Matching | | | 2800 | 652 |
| 1632E1 | Distance Tree (easy version) | | | 2400 | 1.4k |
| 1632E2 | Distance Tree (hard version) | | | 2700 | 1.3k |
| 1628E | Groceries in Meteor Town | | | 3100 | 1.3k |
| 1627C | Not Assigning | | | 1400 | 16.4k |
| 1626E | Black and White Tree | | | 2400 | 1.9k |
| 1625D | Binary Spiders | | | 2300 | 2.4k |
| 1625E1 | Cats on the Upgrade (easy version) | | | 2500 | 1.2k |
| 1625E2 | Cats on the Upgrade (hard version) | | | 2800 | 705 |
| 1623E | Middle Duplication | | | 2500 | 1.3k |
| 1621H | Trains and Airplanes | | | 3500 | 267 |
| 1617E | Christmas Chocolates | | | 2700 | 1.1k |
| 1615D | X(or)-mas Tree | | | 2200 | 2.2k |
| 1615E | Purple Crayon | | | 2400 | 1.8k |