| 1141G | Privatization of Roads in Treeland | | | 1900 | 2.6k |
| 1140G | Double Tree | | | 2700 | 658 |
| 1139C | Edgy Trees | | | 1500 | 17.4k |
| 1137F | Matches Are Not a Child's Play | | | 3400 | 532 |
| 1132G | Greedy Subsequences | | | 2400 | 1.3k |
| 1129E | Legendary Tree | | | 3100 | 634 |
| 1120D | Power Tree | | | 2500 | 1.8k |
| 1119F | Niyaz and Small Degrees | | | 3400 | 964 |
| 1118F1 | Tree Cutting (Easy Version) | | | 1800 | 6.8k |
| 1118F2 | Tree Cutting (Hard Version) | | | 2700 | 688 |
| 1111E | Tree | | | 2500 | 1.2k |
| 1110F | Nearest Leaf | | | 2600 | 2.2k |
| 1110G | Tree-Tac-Toe | | | 3100 | 771 |
| 1109D | Sasha and Interesting Fact from Graph Theory | | | 2400 | 1.5k |
| 1109F | Sasha and Algorithm of Silence's Sounds | | | 3200 | 427 |
| 1101D | GCD Counting | | | 2000 | 5.5k |
| 1099F | Cookies | | | 2400 | 1.1k |
| 1098A | Sum in the tree | | | 1600 | 9.7k |
| 1098C | Construct a tree | | | 2400 | 1.2k |
| 1097G | Vladislav and a Great Legend | | | 3000 | 1.2k |
| 1092E | Minimal Diameter Forest | | | 2000 | 2.2k |
| 1092F | Tree with Maximum Cost | | | 1900 | 11.5k |
| 1088E | Ehab and a component choosing problem | | | 2400 | 1.6k |
| 1088F | Ehab and a weird weight formula | | | 2800 | 631 |
| 1085D | Minimum Diameter Tree | | | 1700 | 6k |
| 1083A | The Fair Nut and the Best Path | | | 1800 | 6.4k |
| 1083C | Max Mex | | | 2900 | 1.2k |
| 1082F | Speed Dial | | | 2800 | 584 |
| 1076E | Vasya and a Tree | | | 1900 | 4.2k |
| 1073F | Choosing Two Paths | | | 2500 | 668 |
| 1067E | Random Forest Rank | | | 2800 | 591 |
| 1065F | Up and Down the Tree | | | 2500 | 1.4k |
| 1062E | Company | | | 2300 | 2.1k |
| 1060E | Sergey and Subway | | | 2000 | 3.6k |
| 1059E | Split the Tree | | | 2400 | 1.7k |
| 1057A | Bmail Computer Network | | | 900 | 7.7k |
| 1056D | Decorate Apple Tree | | | 1600 | 6.8k |
| 1055F | Tree and XOR | | | 2900 | 665 |
| 1053E | Euler tour | | | 3500 | 250 |
| 1051F | The Shortest Statement | | | 2400 | 3.9k |
| 1045A | Last chance | | | 2500 | 607 |
| 1045C | Hyperspace Highways | | | 2300 | 864 |
| 1045D | Interstellar battle | | | 2200 | 896 |
| 1045J | Moonwalk challenge | | | 2600 | 236 |
| 1044B | Intersecting Subtrees | | | 1900 | 1.7k |
| 1042F | Leaf Sets | | | 2400 | 1.6k |
| 1039D | You Are Given a Tree | | | 2800 | 2.4k |
| 1037D | Valid BFS? | | | 1700 | 19.9k |
| 1034C | Region Separation | | | 2700 | 1.1k |
| 1032F | Vasya and Maximum Matching | | | 2400 | 1.2k |
| 1025D | Recovering BST | | | 2100 | 4.3k |
| 1023F | Mobile Phone Network | | | 2600 | 1.1k |
| 1023G | Pisces | | | 3400 | 193 |
| 1019E | Raining season | | | 3200 | 515 |
| 1016F | Road Projects | | | 2600 | 1.1k |
| 1010D | Mars rover | | | 2000 | 2.6k |
| 1010F | Tree | | | 3400 | 385 |
| 1009F | Dominant Indices | | | 2300 | 8.2k |
| 1007D | Ants | | | 3200 | 383 |
| 1006E | Military Problem | | | 1600 | 12k |
| 1004E | Sonya and Ice Cream | | | 2400 | 1.3k |
| 1000E | We Need More Bosses | | | 2100 | 7k |
| 1000G | Two-Paths | | | 2700 | 792 |
| 997D | Cycles in product | | | 2900 | 855 |
| 995F | Cowmpany Cowmpensation | | | 2700 | 1.8k |
| 990F | Flow Control | | | 2400 | 1.1k |
| 990G | GCD Counting | | | 2400 | 2.4k |
| 986E | Prince's Problem | | | 2800 | 957 |
| 983E | NN country | | | 2800 | 1.2k |
| 982C | Cut 'em all! | | | 1500 | 16.6k |
| 982D | Shark | | | 1900 | 2.5k |
| 981C | Useful Decomposition | | | 1400 | 7k |
| 980E | The Number Games | | | 2200 | 2.4k |
| 980F | Cactus to Tree | | | 2900 | 232 |
| 979C | Kuro and Walking Route | | | 1600 | 7.5k |
| 979D | Kuro and GCD and XOR and SUM | | | 2200 | 2.3k |
| 965E | Short Code | | | 2200 | 2k |
| 963B | Destruction of a Tree | | | 2000 | 3k |
| 962F | Simple Cycles Edges | | | 2400 | 1.7k |
| 962G | Visible Black Areas | | | 2800 | 254 |
| 960D | Full Binary Tree Queries | | | 2100 | 2k |
| 960E | Alternating Tree | | | 2300 | 2.4k |
| 960H | Santa's Gift | | | 3100 | 481 |
| 959C | Mahmoud and Ehab and the wrong algorithm | | | 1500 | 6.3k |
| 958B2 | Maximum Control (medium) | | | 2200 | 765 |
| 955F | Heaps | | | 2600 | 2k |
| 936E | Iqea | | | 3400 | 261 |
| 935E | Fafa and Ancient Mathematics | | | 2300 | 1k |
| 932D | Tree | | | 2200 | 2.1k |
| 930A | Peculiar apple-tree | | | 1500 | 8.6k |
| 928D | Autocompletion | | | 1900 | 834 |
| 925E | May Holidays | | | 2900 | 580 |
| 923C | Perfect Security | | | 1800 | 4.8k |
| 923F | Public Service | | | 3200 | 143 |
| 917D | Stranger Trees | | | 2600 | 1.5k |
| 917E | Upside Down | | | 3400 | 195 |
| 916D | Jamie and To-do List | | | 2200 | 596 |
| 916E | Jamie and Tree | | | 2400 | 2.2k |
| 915F | Imbalance Value of a Tree | | | 2400 | 3.2k |
| 914E | Palindromes in a Tree | | | 2400 | 2k |