| 1383C | String Transformation 2 | | | 3100 | 718 |
| 1381D | The Majestic Brown Tree Snake | | | 3000 | 832 |
| 1380E | Merging Towers | | | 2300 | 2.5k |
| 1379E | Inverse Genealogy | | | 2800 | 538 |
| 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 |
| 1363C | Game On Leaves | | | 1600 | 21.5k |
| 1363E | Tree Shuffling | | | 2000 | 7.6k |
| 1361D | Johnny and James | | | 2900 | 388 |
| 1361E | James and the Chase | | | 3000 | 1k |
| 1344E | Train Tracks | | | 3100 | 685 |
| 1340D | Nastya and Time Machine | | | 2600 | 1.1k |
| 1338B | Edge Weight Assignment | | | 1800 | 9.7k |
| 1338D | Nested Rubber Bands | | | 2700 | 1.2k |
| 1336A | Linova and Kingdom | | | 1600 | 25.5k |
| 1336F | Journey | | | 3500 | 284 |
| 1332F | Independent Set | | | 2500 | 1.2k |
| 1328E | Tree Queries | | | 1900 | 12.3k |
| 1326G | Spiderweb Trees | | | 3500 | 112 |
| 1325C | Ehab and Path-etic MEXs | | | 1500 | 17.9k |
| 1324F | Maximum White Subtree | | | 1800 | 13.6k |
| 1322F | Assigning Fares | | | 3500 | 170 |
| 1320E | Treeland and Viruses | | | 3000 | 1.1k |
| 1311E | Construct the Binary Tree | | | 2200 | 2.9k |
| 1307F | Cow and Vacation | | | 3300 | 690 |
| 1305D | Kuroni and the Celebration | | | 1900 | 5.4k |
| 1304E | 1-Trees and Queries | | | 2000 | 6k |
| 1303G | Sum of Prefix Sums | | | 2700 | 1.1k |
| 1299D | Around the World | | | 3000 | 652 |
| 1297E | Modernization of Treeland | | | unrated | 219 |
| 1296F | Berland Beauty | | | 2100 | 3.1k |
| 1294F | Three Paths on a Tree | | | 2000 | 7.2k |
| 1292C | Xenon's Attack on the Gangs | | | 2300 | 2.4k |
| 1292D | Chaotic V. | | | 2700 | 1.1k |
| 1286B | Numbers on Tree | | | 1800 | 5.7k |
| 1285D | Dr. Evil Underscores | | | 1900 | 8.7k |
| 1285E | Delete a Segment | | | 2300 | 2k |
| 1284F | New Year and Social Network | | | 3200 | 424 |
| 1283F | DIY Garland | | | 2200 | 2.2k |
| 1280C | Jeremy Bearimy | | | 2000 | 3.1k |
| 1280D | Miss Punyverse | | | 2500 | 1.3k |
| 1278D | Segment Tree | | | 2100 | 4.4k |
| 1278E | Tests for problem D | | | 2200 | 2.1k |
| 1276D | Tree Elimination | | | 2900 | 724 |
| 1263F | Economic Difficulties | | | 2400 | 982 |
| 1260F | Colored Tree | | | 2700 | 681 |
| 1254D | Tree Queries | | | 2700 | 1.7k |
| 1254E | Send Tree to Charlie | | | 3300 | 459 |
| 1253F | Cheap Robot | | | 2500 | 2.4k |
| 1252B | Cleaning Robots | | | 2300 | 613 |
| 1252D | Find String in a Grid | | | 3000 | 496 |
| 1252F | Regular Forestation | | | 2400 | 1.1k |
| 1249F | Maximum Weight Subset | | | 2200 | 2.8k |
| 1245D | Shichikuji and Power Grid | | | 1900 | 10.1k |
| 1244D | Paint the Tree | | | 1800 | 8.4k |
| 1238F | The Maximum Subtree | | | 2200 | 2.2k |
| 1228F | One Node is Gone | | | 2500 | 620 |
| 1225F | Tree Factory | | | 2500 | 1k |
| 1223E | Paint the Tree | | | 2100 | 3k |
| 1220E | Tourism | | | 2200 | 3.1k |
| 1217F | Forced Online Queries Problem | | | 2600 | 745 |
| 1214E | Petya and Construction Set | | | 2000 | 2.9k |
| 1214H | Tiles Placement | | | 2800 | 493 |
| 1213G | Path Queries | | | 1800 | 9.9k |
| 1211G | King's Path | | | 2500 | 89 |
| 1211H | Road Repair in Treeland | | | 3100 | 60 |
| 1210C | Kamil and Making a Stream | | | 2000 | 3.7k |
| 1209F | Koala and Notebook | | | 2600 | 1.4k |
| 1208H | Red Blue Tree | | | 3500 | 253 |
| 1207G | Indie Album | | | 2700 | 1.3k |
| 1205D | Almost All | | | 2700 | 795 |
| 1193B | Magic Tree | | | unrated | 510 |
| 1192B | Dynamic Diameter | | | unrated | 1.6k |
| 1188A1 | Add on a Tree | | | 1600 | 9k |
| 1188A2 | Add on a Tree: Revolution | | | 2500 | 1.3k |
| 1187E | Tree Painting | | | 2100 | 11.9k |
| 1184E1 | Daleks' Invasion (easy) | | | 1900 | 1.9k |
| 1184E2 | Daleks' Invasion (medium) | | | 2100 | 1.1k |
| 1184E3 | Daleks' Invasion (hard) | | | 2400 | 698 |
| 1182D | Complete Mirror | | | 2400 | 1k |
| 1181D | Irrigation | | | 2200 | 2.9k |
| 1179C | Serge and Dining Room | | | 2200 | 2.5k |
| 1179D | Fedor Runs for President | | | 2700 | 1.1k |
| 1176E | Cover it! | | | 1700 | 14k |
| 1175E | Minimal Segment Cover | | | 2200 | 4.7k |
| 1174F | Ehab and the Big Finale | | | 2400 | 2.1k |
| 1172B | Nauuo and Circle | | | 1900 | 4.5k |
| 1168D | Anagram Paths | | | 3000 | 536 |
| 1158E | Strange device | | | 3400 | 232 |
| 1156D | 0-1-Tree | | | 2200 | 4.9k |
| 1153D | Serval and Rooted Tree | | | 1900 | 5.6k |
| 1152D | Neko and Aki's Prank | | | 2100 | 2.6k |
| 1149C | Tree Generator™ | | | 2700 | 1.7k |
| 1146F | Leaf Partition | | | 2500 | 1.4k |
| 1143C | Queen | | | 1400 | 18.6k |
| 1142B | Lynyrd Skynyrd | | | 2000 | 4k |