| 685B | Kay and Snowflake | | | 1900 | 5.6k |
| 682C | Alyona and the Tree | | | 1600 | 8.2k |
| 681D | Gifts by the List | | | 2000 | 1.9k |
| 675D | Tree Construction | | | 1800 | 4.3k |
| 665E | Beautiful Subarrays | | | 2100 | 4.7k |
| 653E | Bear and Forgotten Tree 2 | | | 2400 | 1.8k |
| 652E | Pursuit For Artifacts | | | 2300 | 3k |
| 650E | Clockwork Bomb | | | 3200 | 1.1k |
| 643E | Bear and Destroying Subtrees | | | 2700 | 756 |
| 639B | Bear and Forgotten Tree 3 | | | 1600 | 7k |
| 639F | Bear and Chemistry | | | 3300 | 610 |
| 638C | Road Improvement | | | 1800 | 2.4k |
| 633F | The Chocolate Spree | | | 2600 | 1.4k |
| 632F | Magic Matrix | | | 2400 | 1.3k |
| 629E | Famil Door and Roads | | | 2300 | 1.2k |
| 627D | Preorder Test | | | 2600 | 1k |
| 627F | Island Puzzle | | | 3400 | 271 |
| 622E | Ants in Leaves | | | 2200 | 2.5k |
| 620E | New Year Tree | | | 2100 | 7.5k |
| 620F | Xors on Segments | | | 2800 | 910 |
| 618D | Hamiltonian Spanning Tree | | | 2200 | 2.1k |
| 615C | Running Track | | | 2000 | 2.5k |
| 613D | Kingdom and its Cities | | | 2800 | 4.3k |
| 609E | Minimum spanning tree for each edge | | | 2100 | 10.7k |
| 607D | Power Tree | | | 2600 | 688 |
| 603E | Pastoral Oddities | | | 3000 | 1.6k |
| 601D | Acyclic Organic Compounds | | | 2400 | 1.3k |
| 600E | Lomsat gelral | | | 2300 | 19.3k |
| 599E | Sandy and Nuts | | | 2600 | 820 |
| 593D | Happy Tree Party | | | 2400 | 1.5k |
| 592D | Super M | | | 2200 | 3k |
| 587C | Duff in the Army | | | 2200 | 5k |
| 581F | Zublicanes and Mumocrates | | | 2400 | 1.1k |
| 580C | Kefa and Park | | | 1500 | 58k |
| 578F | Mirror Box | | | 3200 | 662 |
| 576B | Invariance of Tree | | | 2100 | 1.9k |
| 575B | Bribes | | | 2200 | 1.3k |
| 573C | Bear and Drawing | | | 2300 | 1.1k |
| 571D | Campus | | | 3100 | 1.2k |
| 570D | Tree Requests | | | 2200 | 9.4k |
| 566A | Matching Names | | | 2300 | 1.1k |
| 566C | Logistical Questions | | | 3000 | 955 |
| 566E | Restoring Map | | | 3200 | 719 |
| 557E | Ann and Half-Palindrome | | | 2300 | 1.3k |
| 555E | Case of Computer Network | | | 2800 | 3.1k |
| 547E | Mike and Friends | | | 2800 | 2.7k |
| 543D | Road Improvement | | | 2300 | 3.4k |
| 540E | Infinite Inversions | | | 2100 | 2.6k |
| 538E | Demiurges Play Again | | | 2200 | 1.7k |
| 536E | Tavas on the Path | | | 3100 | 554 |
| 533A | Berland Miners | | | 3000 | 618 |
| 533B | Work Group | | | 2000 | 2.7k |
| 526G | Spiders Evil Plan | | | 3300 | 902 |
| 522A | Reposts | | | 1200 | 19.3k |
| 519E | A and B and Lecture Rooms | | | 2100 | 8.9k |
| 516D | Drazil and Morning Exercise | | | 2800 | 1.6k |
| 512D | Fox And Travelling | | | 2900 | 1.2k |
| 509F | Progress Monitoring | | | 2300 | 1.2k |
| 507C | Guess Your Way Out! | | | 1700 | 4.6k |
| 504E | Misha and LCP on Tree | | | 3000 | 1.1k |
| 501C | Misha and Forest | | | 1500 | 6.1k |
| 500D | New Year Santa Network | | | 1900 | 3.3k |
| 500G | New Year Running | | | 3200 | 312 |
| 494D | Birthday | | | 2700 | 713 |
| 490F | Treeland Tour | | | 2200 | 2k |
| 487E | Tourists | | | 3200 | 3k |
| 486D | Valid Sets | | | 2100 | 4.4k |
| 482B | Interesting Array | | | 1800 | 7.9k |
| 482D | Random Function and Tree | | | 2700 | 646 |
| 482E | ELCA | | | 3200 | 203 |
| 474E | Pillars | | | 2000 | 4.4k |
| 472D | Design Tutorial: Inverse the Problem | | | 1900 | 6.7k |
| 466E | Information Graph | | | 2100 | 2.7k |
| 463E | Caisa and Tree | | | 2100 | 1.8k |
| 461B | Appleman and Tree | | | 2000 | 7.3k |
| 457F | An easy problem about trees | | | 3200 | 128 |
| 455B | A Lot of Games | | | 1900 | 7.1k |
| 455C | Civilization | | | 2100 | 6.6k |
| 452B | 4-point polyline | | | 1800 | 2.1k |
| 444E | DZY Loves Planting | | | 2700 | 887 |
| 442D | Adam and Tree | | | 2600 | 1.3k |
| 440D | Berland Federalization | | | 2200 | 993 |
| 436C | Dungeons and Candies | | | 1800 | 2.9k |
| 434E | Furukawa Nagisa's Tree | | | 3000 | 452 |
| 431C | k-Tree | | | 1600 | 30.5k |
| 429A | Xor-tree | | | 1300 | 12.4k |
| 429C | Guess the Tree | | | 2300 | 1.1k |
| 418D | Big Problems for Organizers | | | 2800 | 580 |
| 414D | Mashmokh and Water Tanks | | | 2300 | 777 |
| 406D | Hill Climbing | | | 2200 | 1.3k |
| 403E | Two Rooted Trees | | | 2900 | 276 |
| 396C | On Changing Tree | | | unrated | 1.9k |
| 383C | Propagating tree | | | 2000 | 7.8k |
| 382D | Ksenia and Pawns | | | 2200 | 753 |
| 379F | New Year Tree | | | 2400 | 2.8k |
| 375D | Tree and Queries | | | 2400 | 9.3k |
| 374D | Inna and Sequence | | | 2000 | 1k |
| 372D | Choosing Subtree is Fun | | | 2600 | 1.2k |
| 371D | Vessels | | | 1800 | 6.6k |
| 369C | Valera and Elections | | | 1600 | 12.3k |