| 1303G | Sum of Prefix Sums | | | 2700 | 1.1k |
| 1286B | Numbers on Tree | | | 1800 | 5.7k |
| 1285E | Delete a Segment | | | 2300 | 2k |
| 1284F | New Year and Social Network | | | 3200 | 424 |
| 1278D | Segment Tree | | | 2100 | 4.4k |
| 1263F | Economic Difficulties | | | 2400 | 982 |
| 1260F | Colored Tree | | | 2700 | 681 |
| 1254D | Tree Queries | | | 2700 | 1.7k |
| 1252D | Find String in a Grid | | | 3000 | 496 |
| 1217F | Forced Online Queries Problem | | | 2600 | 744 |
| 1209F | Koala and Notebook | | | 2600 | 1.4k |
| 1208H | Red Blue Tree | | | 3500 | 253 |
| 1207G | Indie Album | | | 2700 | 1.3k |
| 1193B | Magic Tree | | | unrated | 510 |
| 1192B | Dynamic Diameter | | | unrated | 1.6k |
| 1184E3 | Daleks' Invasion (hard) | | | 2400 | 698 |
| 1181D | Irrigation | | | 2200 | 2.9k |
| 1179C | Serge and Dining Room | | | 2200 | 2.5k |
| 1179D | Fedor Runs for President | | | 2700 | 1.1k |
| 1175E | Minimal Segment Cover | | | 2200 | 4.7k |
| 1149C | Tree Generator™ | | | 2700 | 1.7k |
| 1142B | Lynyrd Skynyrd | | | 2000 | 4k |
| 1140G | Double Tree | | | 2700 | 658 |
| 1137F | Matches Are Not a Child's Play | | | 3400 | 532 |
| 1132G | Greedy Subsequences | | | 2400 | 1.3k |
| 1119F | Niyaz and Small Degrees | | | 3400 | 964 |
| 1111E | Tree | | | 2500 | 1.2k |
| 1110F | Nearest Leaf | | | 2600 | 2.2k |
| 1109F | Sasha and Algorithm of Silence's Sounds | | | 3200 | 427 |
| 1101D | GCD Counting | | | 2000 | 5.5k |
| 1099F | Cookies | | | 2400 | 1.1k |
| 1088F | Ehab and a weird weight formula | | | 2800 | 631 |
| 1083A | The Fair Nut and the Best Path | | | 1800 | 6.4k |
| 1083C | Max Mex | | | 2900 | 1.2k |
| 1076E | Vasya and a Tree | | | 1900 | 4.2k |
| 1062E | Company | | | 2300 | 2.1k |
| 1059E | Split the Tree | | | 2400 | 1.7k |
| 1045A | Last chance | | | 2500 | 607 |
| 1045J | Moonwalk challenge | | | 2600 | 236 |
| 1042F | Leaf Sets | | | 2400 | 1.6k |
| 1039D | You Are Given a Tree | | | 2800 | 2.4k |
| 1023G | Pisces | | | 3400 | 193 |
| 1019E | Raining season | | | 3200 | 515 |
| 1009F | Dominant Indices | | | 2300 | 8.2k |
| 1007D | Ants | | | 3200 | 383 |
| 1004E | Sonya and Ice Cream | | | 2400 | 1.3k |
| 1000G | Two-Paths | | | 2700 | 792 |
| 986E | Prince's Problem | | | 2800 | 957 |
| 983E | NN country | | | 2800 | 1.2k |
| 982D | Shark | | | 1900 | 2.5k |
| 980E | The Number Games | | | 2200 | 2.4k |
| 979D | Kuro and GCD and XOR and SUM | | | 2200 | 2.3k |
| 965E | Short Code | | | 2200 | 2k |
| 962G | Visible Black Areas | | | 2800 | 254 |
| 960H | Santa's Gift | | | 3100 | 481 |
| 958B2 | Maximum Control (medium) | | | 2200 | 765 |
| 936E | Iqea | | | 3400 | 261 |
| 925E | May Holidays | | | 2900 | 580 |
| 923C | Perfect Security | | | 1800 | 4.8k |
| 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 |
| 894D | Ralph And His Tour in Binary Country | | | 2200 | 1.2k |
| 893F | Subtree Minimum Query | | | 2300 | 2.6k |
| 877E | Danil and a Part-time Job | | | 2000 | 5.8k |
| 860E | Arkady and a Nobody-men | | | 2700 | 554 |
| 838B | Diverging Directions | | | 2100 | 1.1k |
| 833D | Red-Black Cobweb | | | 2800 | 524 |
| 827D | Best Edge Weight | | | 2700 | 1.5k |
| 821C | Okabe and Boxes | | | 1500 | 8k |
| 817E | Choosing The Commander | | | 2000 | 3.9k |
| 817F | MEX Queries | | | 2300 | 3.5k |
| 796C | Bank Hacking | | | 1900 | 3.2k |
| 786D | Rap God | | | 3400 | 174 |
| 786E | ALT | | | 3200 | 849 |
| 776F | Sherlock's bet to Moriarty | | | 2800 | 543 |
| 766E | Mahmoud and a xor trip | | | 2100 | 3.6k |
| 763D | Timofey and a flat tree | | | 2900 | 682 |
| 757G | Can Bash Save the Day? | | | 3400 | 660 |
| 741D | Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths | | | 2900 | 3.8k |
| 739B | Alyona and a tree | | | 1900 | 5.2k |
| 733F | Drivers Dissatisfaction | | | 2200 | 1.4k |
| 722D | Generating Sets | | | 1900 | 3.4k |
| 708C | Centroids | | | 2300 | 4.5k |
| 706D | Vasiliy's Multiset | | | 1800 | 13.1k |
| 704E | Iron Man | | | 3300 | 369 |
| 696A | Lorenzo Von Matterhorn | | | 1500 | 6.5k |
| 696E | ...Wait for it... | | | 3000 | 751 |
| 685B | Kay and Snowflake | | | 1900 | 5.6k |
| 675D | Tree Construction | | | 1800 | 4.3k |
| 665E | Beautiful Subarrays | | | 2100 | 4.7k |
| 650E | Clockwork Bomb | | | 3200 | 1.1k |
| 639F | Bear and Chemistry | | | 3300 | 610 |
| 629E | Famil Door and Roads | | | 2300 | 1.2k |
| 620E | New Year Tree | | | 2100 | 7.5k |
| 620F | Xors on Segments | | | 2800 | 910 |
| 609E | Minimum spanning tree for each edge | | | 2100 | 10.7k |
| 607D | Power Tree | | | 2600 | 687 |