| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Equivalent Strings | Codeforces | Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) | 2 |
| 2 | Pashmak and Parmida's problem | Codeforces | Codeforces Round #261 (Div. 2) | 3 |
| 3 | Painting Fence | Codeforces | Codeforces Round #256 (Div. 2) | 3 |
| 4 | Distance in Tree | Codeforces | VK Cup 2012 Round 1 | 3 |
| 5 | Permutations | Codeforces | Rockethon 2015 | 4 |
| 6 | Xenia and Tree | Codeforces | Codeforces Round #199 (Div. 2) | 4 |
| 7 | Book of Evil | Codeforces | Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1) | 4 |
| 8 | Ciel the Commander | Codeforces | Codeforces Round #190 (Div. 1) & Codeforces Round #190 (Div. 2) | 4 |
| 9 | How many trees? | Codeforces | Codeforces Beta Round #9 (Div. 2 Only) | 5 |
| 10 | Points on Plane | Codeforces | Codeforces Round #319 (Div. 1) & Codeforces Round #319 (Div. 2) | 5 |
| 11 | Tricky Function | Codeforces | Codeforces Round #245 (Div. 1) | 5 |
| 12 | Mashmokh and Reverse Operation | Codeforces | Codeforces Round #240 (Div. 1) & Codeforces Round #240 (Div. 2) | 5 |
| 13 | Counting Rectangles is Fun | Codeforces | Codeforces Round #219 (Div. 1) & Codeforces Round #219 (Div. 2) | 5 |
| 14 | Practice | Codeforces | Codeforces Round #145 (Div. 2, ACM-ICPC Rules) & Codeforces Round #145 (Div. 1, ACM-ICPC Rules) | 6 |
| 15 | Hongcow's Game | Codeforces | Codeforces Round #385 (Div. 1) & Codeforces Round #385 (Div. 2) | 6 |
| 16 | Ciel and Gondolas | Codeforces | Codeforces Round #190 (Div. 1) | 6 |
| 17 | New Year Tree | Codeforces | Good Bye 2013 | 6 |
| 18 | Fairy | Codeforces | Codeforces Beta Round #19 | 7 |
| 19 | Building Bridge | Codeforces | CROC-MBTU 2012, Final Round (Online version, Div. 2) | 7 |
| 20 | Minimum Sum | Codeforces | School Regional Team Contest, Saratov, 2011 | 7 |
| 21 | Beautiful Subarrays | Codeforces | Educational Codeforces Round 12 | 7 |
| 22 | Nanami's Digital Board | Codeforces | Codeforces Round #248 (Div. 2) & Codeforces Round #248 (Div. 1) | 7 |
| 23 | Binary Table | Codeforces | CROC 2016 - Final Round [Private, For Onsite Finalists Only] | 7 |
| 24 | Till I Collapse | Codeforces | Codeforces Round #406 (Div. 1) & Codeforces Round #406 (Div. 2) | 7 |
| 25 | Thief in a Shop | Codeforces | Educational Codeforces Round 9 | 7 |
| 26 | Paint Tree | Codeforces | Codeforces Round #124 (Div. 1) & Codeforces Round #124 (Div. 2) | 7 |
| 27 | Package Delivery | Codeforces | 8VC Venture Cup 2016 - Final Round | 7 |
| 28 | Digit Tree | Codeforces | Codeforces Round #372 (Div. 1) & Codeforces Round #372 (Div. 2) | 7 |
| 29 | Abracadabra | Codeforces | VK Cup 2012 Round 1 | 8 |
| 30 | Pudding Monsters | Codeforces | ZeptoLab Code Rush 2015 | 8 |
| 31 | The Child and Binary Tree | Codeforces | Codeforces Round #250 (Div. 1) | 8 |
| 32 | Permutation | Codeforces | MemSQL Start[c]UP 2.0 - Round 1 | 8 |
| 33 | Magic Matrix | Codeforces | Educational Codeforces Round 9 | 8 |
| 34 | Vowels | Codeforces | Codeforces Round #225 (Div. 1) | 8 |
| 35 | Find a car | Codeforces | Codeforces Round #415 (Div. 1) & Codeforces Round #415 (Div. 2) | 8 |
| 36 | Superset | Codeforces | Yandex.Algorithm 2011 Finals | 8 |
| 37 | Yura and Developers | Codeforces | Looksery Cup 2015 | 8 |
| 38 | Close Vertices | Codeforces | Croc Champ 2013 - Round 2 | 8 |
| 39 | Goodbye Souvenir | Codeforces | Codeforces Round #431 (Div. 1) & Codeforces Round #431 (Div. 2) | 8 |
| 40 | Kingdom and its Cities | Codeforces | Codeforces Round #339 (Div. 1) | 8 |
| 41 | One-Based Arithmetic | Codeforces | Testing Round #10 | 8 |
| 42 | Pastoral Oddities | Codeforces | Codeforces Round #334 (Div. 1) | 9 |
| 43 | Freezing with Style | Codeforces | Codeforces Round #107 (Div. 1) | 9 |
| 44 | Polycarp's Masterpiece | Codeforces | 2015-2016 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) | 9 |
| 45 | Pumping Stations | Codeforces | Codeforces Round #200 (Div. 1) | 9 |
| 46 | Fox And Polygon | Codeforces | Codeforces Round #290 (Div. 1) | 9 |
| 47 | Surprise me! | Codeforces | Codeforces Round #415 (Div. 1) | 9 |
| 48 | Bear and Cavalry | Codeforces | Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) | 9 |
| 49 | New Year Shopping | Codeforces | Good Bye 2014 | 9 |
| 50 | Quick Tortoise | Codeforces | Codeforces Round #144 (Div. 1) | 9 |
| 51 | Not Quick Transformation | Codeforces | Codeforces Beta Round #88 | 9 |
| 52 | Parking Lot | Codeforces | Codeforces Round #274 (Div. 1) | 9 |
| 53 | Maze 2D | Codeforces | Coder-Strike 2014 - Round 2 | 9 |
| 54 | Candies and Stones | Codeforces | Codeforces Beta Round #79 (Div. 1 Only) | 9 |
| 55 | Half-decay tree | Codeforces | Codeforces Beta Round #62 | 9 |
| 56 | Tavas on the Path | Codeforces | Codeforces Round #299 (Div. 1) | 9 |
| 57 | Formurosa | Codeforces | Codeforces Round #134 (Div. 1) & Codeforces Round #134 (Div. 2) | 9 |
| 58 | Empty Rectangles | Codeforces | Codeforces Round #213 (Div. 1) | 10 |
| 59 | Wizards and Roads | Codeforces | Codeforces Round #114 (Div. 1) | 10 |
| 60 | Red-Black Cobweb | Codeforces | Codeforces Round #426 (Div. 1) | 10 |
| 61 | Furukawa Nagisa's Tree | Codeforces | Codeforces Round #248 (Div. 1) | 10 |
| 62 | Finding lines | Codeforces | Codeforces Round #407 (Div. 1) | 10 |
| 63 | Tree or not Tree | Codeforces | Codeforces Beta Round #88 | 10 |
| 64 | Nikita and game | Codeforces | Codeforces Round #430 (Div. 2) | 10 |
| 65 | Logistical Questions | Codeforces | VK Cup 2015 - Finals, online mirror | 10 |
| 66 | Doe Graphs | Codeforces | Codeforces Round #144 (Div. 1) & Codeforces Round #144 (Div. 2) | 10 |