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