| 914H | Ember and Storm's Tree Game | | | 3400 | 322 |
| 913B | Christmas Spruce | | | 1200 | 19.9k |
| 911F | Tree Destruction | | | 2400 | 2.4k |
| 901A | Hashing Trees | | | 1500 | 5.4k |
| 894D | Ralph And His Tour in Binary Country | | | 2200 | 1.2k |
| 893F | Subtree Minimum Query | | | 2300 | 2.6k |
| 891D | Sloth | | | 3100 | 350 |
| 886C | Petya and Catacombs | | | 1300 | 5.7k |
| 877E | Danil and a Part-time Job | | | 2000 | 5.8k |
| 871E | Restore the Tree | | | 2900 | 204 |
| 870E | Points, Lines and Ready-made Titles | | | 2300 | 1.3k |
| 868E | Policeman and a Tree | | | 2700 | 569 |
| 864F | Cities Excursions | | | 2700 | 706 |
| 862B | Mahmoud and Ehab and the bipartiteness | | | 1300 | 27.2k |
| 860E | Arkady and a Nobody-men | | | 2700 | 554 |
| 859D | Third Month Insanity | | | 2100 | 1.2k |
| 859E | Desk Disorder | | | 2100 | 2.2k |
| 856B | Similar Words | | | 2300 | 653 |
| 856D | Masha and Cactus | | | 2400 | 624 |
| 855C | Helga Hufflepuff's Cup | | | 2000 | 2.5k |
| 855D | Rowena Ravenclaw's Diadem | | | 2500 | 630 |
| 855G | Harry Vs Voldemort | | | 3300 | 415 |
| 852I | Dating | | | 2300 | 788 |
| 847L | Berland SU Computer Network | | | 2400 | 363 |
| 846E | Chemistry in Berland | | | 2300 | 1.1k |
| 843C | Upgrading Tree | | | 2600 | 416 |
| 842C | Ilya And The Tree | | | 2000 | 3.8k |
| 842E | Nikita and game | | | 2800 | 522 |
| 840E | In a Trap | | | 3200 | 853 |
| 839C | Journey | | | 1500 | 20.9k |
| 838B | Diverging Directions | | | 2100 | 1.1k |
| 835F | Roads in the Kingdom | | | 2500 | 1.3k |
| 833D | Red-Black Cobweb | | | 2800 | 527 |
| 832D | Misha, Grisha and Underground | | | 1900 | 4.7k |
| 830D | Singer House | | | 2800 | 1k |
| 830E | Perpetual Motion Machine | | | 3100 | 382 |
| 827B | High Load | | | 1800 | 3.7k |
| 827D | Best Edge Weight | | | 2700 | 1.5k |
| 825G | Tree Queries | | | 2500 | 1.5k |
| 822F | Madness | | | 2500 | 400 |
| 821C | Okabe and Boxes | | | 1500 | 8k |
| 817E | Choosing The Commander | | | 2000 | 3.9k |
| 817F | MEX Queries | | | 2300 | 3.5k |
| 815C | Karen and Supermarket | | | 2400 | 3.5k |
| 814D | An overnight dance in discotheque | | | 2000 | 2.6k |
| 812D | Sagheer and Kindergarten | | | 2700 | 383 |
| 812E | Sagheer and Apple Tree | | | 2300 | 1.4k |
| 809E | Surprise me! | | | 3100 | 992 |
| 804D | Expected diameter of a tree | | | 2500 | 1.6k |
| 802J1 | Send the Fool Further! (easy) | | | 1400 | 6.7k |
| 802J2 | Send the Fool Further! (medium) | | | 2100 | 740 |
| 802J3 | Send the Fool Further! (hard) | | | 2400 | 405 |
| 796C | Bank Hacking | | | 1900 | 3.2k |
| 796D | Police Stations | | | 2100 | 7.8k |
| 793E | Problem of offices | | | 2900 | 331 |
| 792D | Paths in a Complete Binary Tree | | | 1900 | 3.5k |
| 786D | Rap God | | | 3400 | 177 |
| 786E | ALT | | | 3200 | 849 |
| 780C | Andryusha and Colored Balloons | | | 1600 | 10.3k |
| 778C | Peterson Polyglot | | | 2500 | 1k |
| 776F | Sherlock's bet to Moriarty | | | 2800 | 544 |
| 772E | Verifying Kingdom | | | 3200 | 224 |
| 771C | Bear and Tree Jumps | | | 2100 | 3.6k |
| 767C | Garland | | | 2000 | 4.7k |
| 766E | Mahmoud and a xor trip | | | 2100 | 3.6k |
| 765E | Tree Folding | | | 2200 | 1.4k |
| 763A | Timofey and a tree | | | 1600 | 12.3k |
| 763D | Timofey and a flat tree | | | 2900 | 682 |
| 762F | Tree nesting | | | 2800 | 513 |
| 761E | Dasha and Puzzle | | | 2000 | 2.4k |
| 758E | Broken Tree | | | 2600 | 636 |
| 757G | Can Bash Save the Day? | | | 3400 | 660 |
| 755C | PolandBall and Forest | | | 1300 | 15.4k |
| 754E | Dasha and cyclic table | | | 2600 | 620 |
| 750F | New Year and Finding Roots | | | 2800 | 622 |
| 748F | Santa Clauses and a Soccer Championship | | | 2300 | 744 |
| 746G | New Roads | | | 2100 | 1.7k |
| 743D | Chloe and pleasant prizes | | | 1800 | 4.8k |
| 741D | Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths | | | 2900 | 3.8k |
| 739B | Alyona and a tree | | | 1900 | 5.2k |
| 735E | Ostap and Tree | | | 2500 | 1.1k |
| 734E | Anton and Tree | | | 2100 | 5.5k |
| 733F | Drivers Dissatisfaction | | | 2200 | 1.4k |
| 724F | Uniformly Branched Trees | | | 2700 | 561 |
| 724G | Xor-matic Number of the Graph | | | 2600 | 1.6k |
| 722D | Generating Sets | | | 1900 | 3.4k |
| 718D | Andrew and Chemistry | | | 2900 | 557 |
| 715C | Digit Tree | | | 2700 | 2.8k |
| 708C | Centroids | | | 2300 | 4.5k |
| 706D | Vasiliy's Multiset | | | 1800 | 13.1k |
| 704E | Iron Man | | | 3300 | 369 |
| 700B | Connecting Universities | | | 1800 | 4.7k |
| 698B | Fix a Tree | | | 1700 | 6.2k |
| 696A | Lorenzo Von Matterhorn | | | 1500 | 6.5k |
| 696B | Puzzles | | | 1700 | 3.9k |
| 696E | ...Wait for it... | | | 3000 | 754 |
| 690C2 | Brain Network (medium) | | | 1500 | 5.1k |
| 690C3 | Brain Network (hard) | | | 2200 | 1k |
| 690F2 | Tree of Life (medium) | | | 2700 | 112 |
| 690F3 | Tree of Life (hard) | | | 3200 | 62 |