You must be logged in to add problems to this category

trees problems
Problem Name Online Judge Contest Difficulty Level
1 Kefa and Park Categories Codeforces Codeforces Round #321 (Div. 2) 1
2 Xenia and Bit Operations Categories Codeforces Codeforces Round #197 (Div. 2) 1
3 Party Categories Codeforces Codeforces Beta Round #87 (Div. 1 Only) & Codeforces Beta Round #87 (Div. 2 Only) 1
4 Chocolate Categories SPOJ 1
5 Nice Binary Trees Categories SPOJ 1
6 Pashmak and Garden Categories Codeforces Codeforces Round #261 (Div. 2) 1
7 Longest path in a tree Categories SPOJ 1
8 k-Tree Categories Codeforces Codeforces Round #247 (Div. 2) 1
9 Timofey and a tree Categories Codeforces Codeforces Round #395 (Div. 1) & Codeforces Round #395 (Div. 2) 2
10 Reposts Categories Codeforces VK Cup 2015 - Qualification Round 1 2
11 Binary Search Tree Categories UVA 2
12 Tree _order Categories SPOJ 2
13 Journey Categories Codeforces Codeforces Round #428 (Div. 2) 2
14 Bear and Forgotten Tree 3 Categories Codeforces VK Cup 2016 - Round 1 2
15 Xor-tree Categories Codeforces Codeforces Round #245 (Div. 1) & Codeforces Round #245 (Div. 2) 2
16 Interesting Array Categories Codeforces Codeforces Round #275 (Div. 1) & Codeforces Round #275 (Div. 2) 3
17 Okabe and Boxes Categories Codeforces Codeforces Round #420 (Div. 2) 3
18 Misha and Forest Categories Codeforces Codeforces Round #285 (Div. 2) & Codeforces Round #285 (Div. 1) 3
19 Anton and Making Potions Categories Codeforces Codeforces Round #379 (Div. 2) 3
20 Valera and Elections Categories Codeforces Codeforces Round #216 (Div. 2) 3
21 Alyona and the Tree Categories Codeforces Codeforces Round #358 (Div. 2) 3
22 Vasiliy's Multiset Categories Codeforces Codeforces Round #367 (Div. 2) 3
23 Ants Colony Categories UVA 3
24 Choosing Capital for Treeland Categories Codeforces Codeforces Round #135 (Div. 2) 3
25 Distance in Tree Categories Codeforces VK Cup 2012 Round 1 3
26 Connecting Universities Categories Codeforces Codeforces Round #364 (Div. 1) & Codeforces Round #364 (Div. 2) 4
27 Civilization Categories Codeforces Codeforces Round #260 (Div. 1) & Codeforces Round #260 (Div. 2) 4
28 Tree Requests Categories Codeforces Codeforces Round #316 (Div. 2) 4
29 Lomsat gelral Categories Codeforces Educational Codeforces Round 2 4
30 Ciel the Commander Categories Codeforces Codeforces Round #190 (Div. 1) & Codeforces Round #190 (Div. 2) 4
31 Xenia and Tree Categories Codeforces Codeforces Round #199 (Div. 2) 4
32 Zero Tree Categories Codeforces Codeforces Round #168 (Div. 1) & Codeforces Round #168 (Div. 2) 4
33 A Lot of Games Categories Codeforces Codeforces Round #260 (Div. 1) & Codeforces Round #260 (Div. 2) 4
34 Vessels Categories Codeforces Codeforces Round #218 (Div. 2) 4
35 Closest distance Categories SPOJ 4
36 Tree Construction Categories Codeforces Codeforces Round #353 (Div. 2) 4
37 Design Tutorial: Inverse the Problem Categories Codeforces Codeforces Round #270 4
38 Eternal Victory Categories Codeforces Codeforces Beta Round #57 (Div. 2) 4
39 Garland Categories Codeforces Codeforces Round #398 (Div. 2) 4
40 Chloe and pleasant prizes Categories Codeforces Codeforces Round #384 (Div. 2) 4
41 New Year Santa Network Categories Codeforces Good Bye 2014 4
42 Roads not only in Berland Categories Codeforces Codeforces Beta Round #25 (Div. 2 Only) 4
43 Book of Evil Categories Codeforces Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1) 4
44 Alyona and a tree Categories Codeforces Codeforces Round #381 (Div. 1) & Codeforces Round #381 (Div. 2) 4
45 Count Minimum Spanning Trees Categories SPOJ 4
46 Fools and Roads Categories Codeforces Codeforces Round #121 (Div. 1) & Codeforces Round #121 (Div. 2) 4
47 Propagating tree Categories Codeforces Codeforces Round #225 (Div. 1) & Codeforces Round #225 (Div. 2) 4
48 Enemy is weak Categories Codeforces Codeforces Beta Round #57 (Div. 2) 4
49 Appleman and Tree Categories Codeforces Codeforces Round #263 (Div. 1) & Codeforces Round #263 (Div. 2) 4
50 A and B and Lecture Rooms Categories Codeforces Codeforces Round #294 (Div. 2) 4
51 Ilya And The Tree Categories Codeforces Codeforces Round #430 (Div. 2) 4
52 Kay and Snowflake Categories Codeforces Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2) 5
53 Sausage Maximization Categories Codeforces Codeforces Round #173 (Div. 2) 5
54 Exposition Categories Codeforces Codeforces Beta Round #6 (Div. 2 Only) 5
55 Tree and Queries Categories Codeforces Codeforces Round #221 (Div. 1) 5
56 An overnight dance in discotheque Categories Codeforces Codeforces Round #418 (Div. 2) 5
57 Blood Cousins Categories Codeforces Codeforces Round #130 (Div. 2) 5
58 4-point polyline Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 5
59 Spiders Categories Codeforces School Regional Team Contest, Saratov, 2011 5
60 Two Paths Categories Codeforces Codeforces Beta Round #14 (Div. 2) 5
61 Running Track Categories Codeforces Codeforces Round #338 (Div. 2) 5
62 Dungeons and Candies Categories Codeforces Zepto Code Rush 2014 5
63 Misha, Grisha and Underground Categories Codeforces Codeforces Round #425 (Div. 2) 5
64 Lucky Tree Categories Codeforces Codeforces Beta Round #84 (Div. 1 Only) & Codeforces Beta Round #84 (Div. 2 Only) 5
65 Duff in the Army Categories Codeforces Codeforces Round #326 (Div. 1) & Codeforces Round #326 (Div. 2) 5
66 Water Tree Categories Codeforces Codeforces Round #200 (Div. 1) 5
67 Valid Sets Categories Codeforces Codeforces Round #277 (Div. 2) 5
68 Pillars Categories Codeforces Codeforces Round #271 (Div. 2) 5
69 Petr# Categories Codeforces Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) 5
70 Super M Categories Codeforces Codeforces Round #328 (Div. 2) 5
71 Minimum spanning tree for each edge Categories Codeforces Educational Codeforces Round 3 5
72 Cutting Figure Categories Codeforces Codeforces Round #122 (Div. 1) & Codeforces Round #122 (Div. 2) 5
73 On Changing Tree Categories Codeforces Codeforces Round #232 (Div. 1) & Codeforces Round #232 (Div. 2) 6
74 Caisa and Tree Categories Codeforces Codeforces Round #264 (Div. 2) 6
75 Avoiding a disaster Categories A2 Online Judge 6
76 Demiurges Play Again Categories Codeforces Codeforces Round #300 6
77 Information Graph Categories Codeforces Codeforces Round #266 (Div. 2) 6
78 Gifts by the List Categories Codeforces Codeforces Round #357 (Div. 2) 6
79 New Year Tree Categories Codeforces Good Bye 2013 6
80 Mahmoud and a xor trip Categories Codeforces Codeforces Round #396 (Div. 2) 6
81 WTF? Categories Codeforces April Fools Day Contest 2013 6
82 Infinite Inversions Categories Codeforces Codeforces Round #301 (Div. 2) 6
83 Karen and Supermarket Categories Codeforces Codeforces Round #419 (Div. 1) & Codeforces Round #419 (Div. 2) 6
84 Hamiltonian Spanning Tree Categories Codeforces Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) 6
85 Invariance of Tree Categories Codeforces Codeforces Round #319 (Div. 1) & Codeforces Round #319 (Div. 2) 6
86 Road Improvement Categories Codeforces Codeforces Round #302 (Div. 1) 6
87 Ants in Leaves Categories Codeforces Educational Codeforces Round 7 6
88 Apple Tree Categories Codeforces Codeforces Round #202 (Div. 1) & Codeforces Round #202 (Div. 2) 6
89 Work Group Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 6
90 Game on Tree Categories Codeforces Codeforces Round #172 (Div. 1) & Codeforces Round #172 (Div. 2) 6
91 Ant on the Tree Categories Codeforces Codeforces Beta Round #29 (Div. 2, Codeforces format) 6
92 Paint Tree Categories Codeforces Codeforces Round #124 (Div. 1) & Codeforces Round #124 (Div. 2) 7
93 Happy Tree Party Categories Codeforces Codeforces Round #329 (Div. 2) 7
94 Gift Categories Codeforces All-Ukrainian School Olympiad in Informatics 7
95 Treeland Tour Categories Codeforces Codeforces Round #279 (Div. 2) 7
96 Road Improvement Categories Codeforces VK Cup 2016 - Qualification Round 2 7
97 Big Maximum Sum Categories Codeforces Codeforces Beta Round #67 (Div. 2) 7
98 Ann and Half-Palindrome Categories Codeforces Codeforces Round #311 (Div. 2) 7
99 Ralph And His Tour in Binary Country Categories Codeforces Codeforces Round #447 (Div. 2) 7
100 Black and White Tree Categories Codeforces Codeforces Round #158 (Div. 2) 7
101 Little Elephant and Tree Categories Codeforces Codeforces Round #157 (Div. 1) 7
102 Hill Climbing Categories Codeforces Codeforces Round #238 (Div. 1) 7
103 Beavermuncher-0xFF Categories Codeforces Codeforces Beta Round #69 (Div. 1 Only) & Codeforces Beta Round #69 (Div. 2 Only) 7
104 Cactus Categories Codeforces Codeforces Round #143 (Div. 2) 7
105 Peterson Polyglot Categories Codeforces Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) 7
106 Pursuit For Artifacts Categories Codeforces Educational Codeforces Round 10 7
107 Beard Graph Categories Codeforces Codeforces Round #112 (Div. 2) 7
108 Famil Door and Roads Categories Codeforces Codeforces Round #343 (Div. 2) 7
109 Bear and Drawing Categories Codeforces Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) & Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) 7
110 Acyclic Organic Compounds Categories Codeforces Codeforces Round #333 (Div. 1) 7
111 World Eater Brothers Categories Codeforces Codeforces Round #148 (Div. 1) & Codeforces Round #148 (Div. 2) 7
112 Ksenia and Pawns Categories Codeforces Codeforces Round #224 (Div. 2) 7
113 Little Girl and Problem on Trees Categories Codeforces Codeforces Round #169 (Div. 2) 7
114 Old Berland Language Categories Codeforces Codeforces Beta Round #37 7
115 Bribes Categories Codeforces Bubble Cup 8 - Finals [Online Mirror] 7
116 New Roads Categories Codeforces Codeforces Round #386 (Div. 2) 7
117 Guess the Tree Categories Codeforces Codeforces Round #245 (Div. 1) & Codeforces Round #245 (Div. 2) 7
118 Tree Categories A2 Online Judge 7
119 Blood Cousins Return Categories Codeforces Codeforces Round #151 (Div. 2) 7
120 Iahub and Xors Categories Codeforces Codeforces Round #198 (Div. 1) 7
121 Inna and Sequence Categories Codeforces Codeforces Round #220 (Div. 2) 7
122 Case of Computer Network Categories Codeforces Codeforces Round #310 (Div. 1) 7
123 Divisor Tree Categories Codeforces Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1) 7
124 Preorder Test Categories Codeforces 8VC Venture Cup 2016 - Final Round 8
125 DZY Loves Planting Categories Codeforces Codeforces Round #254 (Div. 1) 8
126 Balance Categories Codeforces Codeforces Round #188 (Div. 1) & Codeforces Round #188 (Div. 2) 8
127 Kingdom and its Cities Categories Codeforces Codeforces Round #339 (Div. 1) 8
128 e-Government Categories Codeforces VK Cup 2012 Round 2 8
129 Beautiful Road Categories Codeforces Codeforces Beta Round #73 (Div. 1 Only) 8
130 Polo the Penguin and Trees Categories Codeforces Codeforces Round #177 (Div. 1) 8
131 Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths Categories Codeforces Codeforces Round #383 (Div. 1) 8
132 Birthday Categories Codeforces Codeforces Round #282 (Div. 1) 8
133 Castle Categories Codeforces Codeforces Beta Round #79 (Div. 1 Only) 8
134 Matching Names Categories Codeforces VK Cup 2015 - Finals, online mirror 8
135 Zublicanes and Mumocrates Categories Codeforces Codeforces Round #322 (Div. 2) 8
136 IT Restaurants Categories Codeforces VK Cup 2012 Finals (unofficial online-version) 8
137 Scheme Categories Codeforces Codeforces Beta Round #22 (Div. 2 Only) 8
138 Archaeology Categories Codeforces Croc Champ 2012 - Round 2 8
139 Magic Matrix Categories Codeforces Educational Codeforces Round 9 8
140 Close Vertices Categories Codeforces Croc Champ 2013 - Round 2 8
141 Petya and Tree Categories Codeforces Yandex.Algorithm 2011 Round 1 8
142 Choosing Subtree is Fun Categories Codeforces Codeforces Round #219 (Div. 1) 8
143 Drazil and Morning Exercise Categories Codeforces Codeforces Round #292 (Div. 1) 8
144 Thwarting Demonstrations Categories Codeforces Codeforces Round #121 (Div. 1) 8
145 Adam and Tree Categories Codeforces Codeforces Round #253 (Div. 1) 8
146 Tourists Categories Codeforces Codeforces Round #278 (Div. 1) 8
147 The Chocolate Spree Categories Codeforces Manthan, Codefest 16 8
148 Shaass the Great Categories Codeforces Codeforces Round #178 (Div. 2) 8
149 Genetic engineering Categories Codeforces Yandex.Algorithm 2011 Round 2 8
150 Pilgrims Categories Codeforces Codeforces Round #202 (Div. 1) 9
151 Tavas on the Path Categories Codeforces Codeforces Round #299 (Div. 1) 9
152 Noble Knight's Path Categories Codeforces Codeforces Round #140 (Div. 1) 9
153 Singer House Categories Codeforces Codeforces Round #424 (Div. 1, rated, based on VK Cup Finals) 9
154 Random Function and Tree Categories Codeforces Codeforces Round #275 (Div. 1) 9
155 Big Problems for Organizers Categories Codeforces RCC 2014 Warmup (Div. 1) 9
156 Caterpillar Categories Codeforces Codeforces Beta Round #48 9
157 Timofey and a flat tree Categories Codeforces Codeforces Round #395 (Div. 1) 9
158 Freezing with Style Categories Codeforces Codeforces Round #107 (Div. 1) 9
159 Pairs Categories Codeforces Yandex.Algorithm Open 2011 Qualification 1 9
160 Fox And Travelling Categories Codeforces Codeforces Round #290 (Div. 1) 9
161 Maze Categories Codeforces Codeforces Beta Round #92 (Div. 1 Only) 9
162 Berland Federalization Categories Codeforces Testing Round #10 9
163 Alien DNA Categories Codeforces Codeforces Round #134 (Div. 1) 9
164 Pastoral Oddities Categories Codeforces Codeforces Round #334 (Div. 1) 9
165 Garden Categories Codeforces Codeforces Round #108 (Div. 2) 9
166 Surprise me! Categories Codeforces Codeforces Round #415 (Div. 1) 9
167 Clockwork Bomb Categories Codeforces Codeforces Round #345 (Div. 1) 9
168 Information Reform Categories Codeforces Codeforces Beta Round #64 9
169 Arkady and a Nobody-men Categories Codeforces Codeforces Round #434 (Div. 1, based on Technocup 2018 Elimination Round 1) 9
170 Tree or not Tree Categories Codeforces Codeforces Beta Round #88 10
171 ALT Categories Codeforces Codeforces Round #406 (Div. 1) 10
172 Perpetual Motion Machine Categories Codeforces Codeforces Round #424 (Div. 1, rated, based on VK Cup Finals) 10
173 Help King Categories Codeforces Codeforces Beta Round #78 (Div. 1 Only) & Codeforces Beta Round #78 (Div. 2 Only) 10
174 Furukawa Nagisa's Tree Categories Codeforces Codeforces Round #248 (Div. 1) 10
175 Galaxy Union Categories Codeforces School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) 10
176 Island Puzzle Categories Codeforces 8VC Venture Cup 2016 - Final Round 10
177 Campus Categories Codeforces Codeforces Round #317 [AimFund Thanks-Round] (Div. 1) 10
178 Misha and LCP on Tree Categories Codeforces Codeforces Round #285 (Div. 1) 10
179 Restore the Tree Categories Codeforces Codeforces Round #440 (Div. 1, based on Technocup 2018 Elimination Round 2) 10
180 Leaders Categories Codeforces Yandex.Algorithm 2011 Finals 10
181 Spiders Evil Plan Categories Codeforces ZeptoLab Code Rush 2015 10
182 ELCA Categories Codeforces Codeforces Round #275 (Div. 1) 10
183 Iron Man Categories Codeforces Codeforces Round #366 (Div. 1) 10
184 Bear and Chemistry Categories Codeforces VK Cup 2016 - Round 1 10
185 Escaping on Beaveractor Categories Codeforces ABBYY Cup 3.0 - Finals (online version) 10
186 In a Trap Categories Codeforces Codeforces Round #429 (Div. 1) 10
187 Logistical Questions Categories Codeforces VK Cup 2015 - Finals, online mirror 10
188 Berland Miners Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 10
189 An easy problem about trees Categories Codeforces MemSQL Start[c]UP 2.0 - Round 2 10
190 Red-Black Cobweb Categories Codeforces Codeforces Round #426 (Div. 1) 10
191 Restoring Map Categories Codeforces VK Cup 2015 - Finals, online mirror 10
192 Sloth Categories Codeforces Codeforces Round #446 (Div. 1) 10
193 New Year Running Categories Codeforces Good Bye 2014 10
194 Rap God Categories Codeforces Codeforces Round #406 (Div. 1) 10
195 Mirror Box Categories Codeforces Codeforces Round #320 (Div. 1) [Bayan Thanks-Round] 10
196 Nikita and game Categories Codeforces Codeforces Round #430 (Div. 2) 10
197 Tree and Table Categories Codeforces Codeforces Round #153 (Div. 1) 10