| 1741D | Masha and a Beautiful Tree | | | 1300 | 18.7k |
| 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 |
| 1709F | Multiset of Strings | | | 2500 | 729 |
| 1707C | DFS Trees | | | 2400 | 2k |
| 1696F | Tree Recovery | | | 2600 | 1.2k |
| 1682E | Unordered Swaps | | | 2700 | 777 |
| 1680F | Lenient Vertex Cover | | | 2600 | 979 |
| 1676G | White-Black Balanced Subtrees | | | 1300 | 25.6k |
| 1675D | Vertical Paths | | | 1300 | 15.1k |
| 1659F | Tree and Permutation Game | | | 3000 | 255 |
| 1657F | Words on Tree | | | 2600 | 854 |
| 1654G | Snowy Mountain | | | 2900 | 474 |
| 1648E | Air Reform | | | 3200 | 601 |
| 1633E | Spanning Tree Queries | | | 2400 | 1.8k |
| 1632E1 | Distance Tree (easy version) | | | 2400 | 1.4k |
| 1625E1 | Cats on the Upgrade (easy version) | | | 2500 | 1.2k |
| 1625E2 | Cats on the Upgrade (hard version) | | | 2800 | 705 |
| 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 |
| 1609D | Social Network | | | 1600 | 8.6k |
| 1592C | Bakry and Partitioning | | | 1700 | 9.3k |
| 1585G | Poachers | | | 2500 | 339 |
| 1583E | Moment of Bloom | | | 2200 | 2.5k |
| 1559D1 | Mocha and Diana (Easy Version) | | | 1400 | 16.5k |
| 1559D2 | Mocha and Diana (Hard Version) | | | 2500 | 3.2k |
| 1555F | Good Graph | | | 2700 | 1.1k |
| 1547G | How Many Paths? | | | 2100 | 3.7k |
| 1540B | Tree Array | | | 2300 | 3.1k |
| 1534H | Lost Nodes | | | 3500 | 314 |
| 1519E | Off by One | | | 2700 | 943 |
| 1515F | Phoenix and Earthquake | | | 2600 | 2.2k |
| 1508C | Complete the MST | | | 2500 | 1.8k |
| 1495D | BFS Trees | | | 2600 | 1.6k |
| 1495F | Squares | | | 3300 | 533 |
| 1463E | Plan of Lectures | | | 2400 | 1.8k |
| 1454E | Number of Simple Paths | | | 2000 | 6.8k |
| 1437D | Minimal Height Tree | | | 1600 | 14.6k |
| 1436D | Bandit in a City | | | 1900 | 6.6k |
| 1423C | Dušan's Railway | | | 3500 | 222 |
| 1416D | Graph and Queries | | | 2600 | 2.9k |
| 1408E | Avoid Rainbow Cycles | | | 2400 | 2.2k |
| 1408G | Clusterization Counting | | | 2700 | 1.4k |
| 1406C | Link Cut Centroids | | | 1700 | 12k |
| 1403B | Spring cleaning | | | 2300 | 437 |
| 1402C | Star Trek | | | 2600 | 271 |
| 1391E | Pairs of Pairs | | | 2600 | 2.1k |
| 1389G | Directing Edges | | | 2800 | 540 |
| 1388D | Captain Flint and Treasure | | | 2000 | 7k |
| 1383A | String Transformation 1 | | | 1700 | 11.4k |
| 1383C | String Transformation 2 | | | 3100 | 718 |
| 1375G | Tree Modification | | | 2800 | 2.3k |
| 1370F1 | The Hidden Pair (Easy Version) | | | 2400 | 1.8k |
| 1370F2 | The Hidden Pair (Hard Version) | | | 2700 | 1.7k |
| 1369D | TediousLee | | | 1900 | 9.3k |
| 1368G | Shifting Dominoes | | | 3200 | 797 |
| 1364D | Ehab's Last Corollary | | | 2100 | 5.1k |
| 1361E | James and the Chase | | | 3000 | 1k |
| 1340D | Nastya and Time Machine | | | 2600 | 1.1k |
| 1336F | Journey | | | 3500 | 284 |
| 1328E | Tree Queries | | | 1900 | 12.3k |
| 1324F | Maximum White Subtree | | | 1800 | 13.6k |
| 1299D | Around the World | | | 3000 | 652 |
| 1292D | Chaotic V. | | | 2700 | 1.1k |
| 1286B | Numbers on Tree | | | 1800 | 5.7k |
| 1285E | Delete a Segment | | | 2300 | 2k |
| 1284F | New Year and Social Network | | | 3200 | 424 |
| 1280C | Jeremy Bearimy | | | 2000 | 3.1k |
| 1278D | Segment Tree | | | 2100 | 4.4k |
| 1263F | Economic Difficulties | | | 2400 | 982 |
| 1253F | Cheap Robot | | | 2500 | 2.4k |
| 1245D | Shichikuji and Power Grid | | | 1900 | 10.1k |
| 1244D | Paint the Tree | | | 1800 | 8.4k |
| 1238F | The Maximum Subtree | | | 2200 | 2.2k |
| 1220E | Tourism | | | 2200 | 3.1k |
| 1217F | Forced Online Queries Problem | | | 2600 | 744 |
| 1214E | Petya and Construction Set | | | 2000 | 2.9k |
| 1213G | Path Queries | | | 1800 | 9.9k |
| 1209F | Koala and Notebook | | | 2600 | 1.4k |
| 1184E1 | Daleks' Invasion (easy) | | | 1900 | 1.9k |
| 1184E2 | Daleks' Invasion (medium) | | | 2100 | 1.1k |
| 1184E3 | Daleks' Invasion (hard) | | | 2400 | 698 |
| 1176E | Cover it! | | | 1700 | 14k |
| 1174F | Ehab and the Big Finale | | | 2400 | 2.1k |
| 1141G | Privatization of Roads in Treeland | | | 1900 | 2.6k |
| 1139C | Edgy Trees | | | 1500 | 17.4k |
| 1120D | Power Tree | | | 2500 | 1.8k |
| 1111E | Tree | | | 2500 | 1.2k |
| 1098C | Construct a tree | | | 2400 | 1.2k |
| 1056D | Decorate Apple Tree | | | 1600 | 6.8k |
| 1051F | The Shortest Statement | | | 2400 | 3.9k |
| 1045A | Last chance | | | 2500 | 607 |
| 1045C | Hyperspace Highways | | | 2300 | 864 |
| 1042F | Leaf Sets | | | 2400 | 1.6k |
| 1037D | Valid BFS? | | | 1700 | 19.9k |
| 1023F | Mobile Phone Network | | | 2600 | 1.1k |