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data structures problems
Problem Name Online Judge Year Contest Difficulty Level
1 Banknotes and Coins Categories URI 1
2 Can you answer these queries I Categories SPOJ 1
3 Snacktower Categories Codeforces Codeforces Round #398 (Div. 2) 1
4 Can you answer these queries II Categories SPOJ 1
5 Theatre Square Categories Codeforces Codeforces Beta Round #1 1
6 Street Parade Categories SPOJ 1
7 A and B and Compilation Errors Categories Codeforces Codeforces Round #294 (Div. 2) 1
8 4 Values whose Sum is 0 Categories Live Archive 2005 Europe - Southwestern 1
9 Little Girl and Maximum Sum Categories Codeforces Codeforces Round #169 (Div. 2) 1
10 Han Solo and Lazer Gun Categories Codeforces Codeforces Round #291 (Div. 2) 1
11 How to Handle the Fans Categories SPOJ 1
12 Registration System Categories Codeforces Codeforces Beta Round #4 (Div. 2 Only) 1
13 Can you answer these queries III Categories SPOJ 1
14 Misha and Changing Handles Categories Codeforces Codeforces Round #285 (Div. 2) 1
15 Division of Nlogonia Categories UVA 1
16 Xenia and Bit Operations Categories Codeforces Codeforces Round #197 (Div. 2) 1
17 Number of Ways Categories Codeforces Codeforces Round #266 (Div. 2) 1
18 Prison Transfer Categories Codeforces Codeforces Round #244 (Div. 2) 1
19 Simple Math Categories A2 Online Judge 1
20 Maximum Sum Categories SPOJ 1
21 Sereja and Suffixes Categories Codeforces Codeforces Round #215 (Div. 2) 1
22 Watchmen Categories Codeforces Codeforces Round #345 (Div. 1) & Codeforces Round #345 (Div. 2) 1
23 Escape from Stones Categories Codeforces Codeforces Round #162 (Div. 1) & Codeforces Round #162 (Div. 2) 2
24 Alternating Current Categories Codeforces Codeforces Round #200 (Div. 1) & Codeforces Round #200 (Div. 2) 2
25 Sonya and Queries Categories Codeforces Codeforces Round #371 (Div. 1) & Codeforces Round #371 (Div. 2) 2
26 Color the Fence Categories Codeforces Codeforces Round #202 (Div. 2) 2
27 Photo to Remember Categories Codeforces VK Cup 2015 - Qualification Round 1 2
28 Hardwood Species Categories TJU 2
29 Replacement Categories Codeforces Codeforces Round #316 (Div. 2) 2
30 Anya and Smartphone Categories Codeforces Codeforces Round #293 (Div. 2) 2
31 The Festive Evening Categories Codeforces Codeforces Round #426 (Div. 2) 2
32 Chat Order Categories Codeforces VK Cup 2016 - Qualification Round 1 2
33 Binary Search Tree Categories UVA 2
34 Airport Categories Codeforces Codeforces Round #134 (Div. 2) 2
35 Vasya and Multisets Categories Codeforces Educational Codeforces Round 51 (Rated for Div. 2) 2
36 Geometric Progression Categories Codeforces Codeforces Round #Pi (Div. 2) 2
37 FIGUREFUL Categories SPOJ 2
38 Knight Tournament Categories Codeforces Codeforces Round #207 (Div. 1) & Codeforces Round #207 (Div. 2) 2
39 Thor Categories Codeforces Codeforces Round #366 (Div. 1) & Codeforces Round #366 (Div. 2) 2
40 Karen and Coffee Categories Codeforces Codeforces Round #419 (Div. 2) 2
41 Modulo Sum Categories Codeforces Codeforces Round #319 (Div. 2) 2
42 Counting heaps Categories Live Archive 2008 Europe - Central 2
43 Game of Credit Cards Categories Codeforces Codeforces Round #401 (Div. 2) 2
44 Cd and pwd commands Categories Codeforces VK Cup 2012 Qualification Round 1 2
45 Greg and Array Categories Codeforces Codeforces Round #179 (Div. 1) & Codeforces Round #179 (Div. 2) 2
46 True Friends Categories SPOJ 2
47 Hoax or what Categories UVA 2
48 New Reform Categories Codeforces Codeforces Round #346 (Div. 2) 3
49 Bubble Sort Graph Categories Codeforces Codeforces Round #198 (Div. 2) & Codeforces Round #198 (Div. 1) 3
50 Vasiliy's Multiset Categories Codeforces Codeforces Round #367 (Div. 2) 3
51 Interesting Array Categories Codeforces Codeforces Round #275 (Div. 1) & Codeforces Round #275 (Div. 2) 3
52 Mike and Feet Categories Codeforces Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) 3
53 Present Categories Codeforces Codeforces Round #262 (Div. 2) 3
54 Dima and Staircase Categories Codeforces Codeforces Round #167 (Div. 2) & Codeforces Round #167 (Div. 1) 3
55 Colorful Graph Categories Codeforces Codeforces Round #151 (Div. 2) 3
56 Stripe Categories Codeforces Codeforces Beta Round #18 (Div. 2 Only) 3
57 Heap Operations Categories Codeforces Codeforces Round #357 (Div. 2) 3
58 Bear and Prime Numbers Categories Codeforces Codeforces Round #226 (Div. 2) 3
59 Replace To Make Regular Bracket Sequence Categories Codeforces Educational Codeforces Round 4 3
60 Almost Union-Find Categories UVA 3
61 Powerful array Categories Codeforces Yandex.Algorithm 2011 Round 2 3
62 Maximum Absurdity Categories Codeforces Codeforces Round #193 (Div. 2) 3
63 Little Elephant and Array Categories Codeforces Codeforces Round #136 (Div. 1) & Codeforces Round #136 (Div. 2) 3
64 Blue Mary Needs Help Again Categories SPOJ 3
65 Sereja and Algorithm Categories Codeforces Codeforces Round #215 (Div. 1) 3
66 Okabe and Boxes Categories Codeforces Codeforces Round #420 (Div. 2) 3
67 Glass Carving Categories Codeforces Codeforces Round #296 (Div. 2) & Codeforces Round #296 (Div. 1) 3
68 Plug-in Categories Codeforces Yandex.Algorithm Open 2011 Qualification 1 3
69 Not Equal on a Segment Categories Codeforces Educational Codeforces Round 7 3
70 Sereja and Brackets Categories Codeforces Codeforces Round #223 (Div. 1) & Codeforces Round #223 (Div. 2) 3
71 Level Order Tree Traversal Categories URI 3
72 Regular Bracket Sequence Categories Codeforces Codeforces Beta Round #26 (Codeforces format) 3
73 Order Book Categories Codeforces Codeforces Round #317 [AimFund Thanks-Round] (Div. 2) 3
74 Stacks Categories Timus 3
75 Multithreading Categories Codeforces Codeforces Round #165 (Div. 2) 3
76 A and B and Interesting Substrings Categories Codeforces Codeforces Round #294 (Div. 2) 3
77 Bear and Blocks Categories Codeforces Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) & Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) 3
78 Longest Regular Bracket Sequence Categories Codeforces Codeforces Beta Round #5 3
79 Pashmak and Parmida's problem Categories Codeforces Codeforces Round #261 (Div. 2) 3
80 Good Substrings Categories Codeforces Codeforces Round #166 (Div. 2) 3
81 Misha and Forest Categories Codeforces Codeforces Round #285 (Div. 2) & Codeforces Round #285 (Div. 1) 3
82 Milking cows Categories Codeforces Codeforces Round #225 (Div. 1) & Codeforces Round #225 (Div. 2) 3
83 Alyona and a tree Categories Codeforces Codeforces Round #381 (Div. 1) & Codeforces Round #381 (Div. 2) 4
84 Almost Arithmetical Progression Categories Codeforces Codeforces Round #156 (Div. 2) & Codeforces Round #156 (Div. 1) 4
85 King's Path Categories Codeforces Codeforces Round #149 (Div. 2) 4
86 Matrix Categories Codeforces Codeforces Round #213 (Div. 1) & Codeforces Round #213 (Div. 2) 4
87 Pair of Numbers Categories Codeforces Codeforces Round #209 (Div. 2) 4
88 Fox And Jumping Categories Codeforces Codeforces Round #290 (Div. 2) & Codeforces Round #290 (Div. 1) 4
89 Propagating tree Categories Codeforces Codeforces Round #225 (Div. 1) & Codeforces Round #225 (Div. 2) 4
90 Fools and Roads Categories Codeforces Codeforces Round #121 (Div. 1) & Codeforces Round #121 (Div. 2) 4
91 Case of Fugitive Categories Codeforces Codeforces Round #310 (Div. 1) & Codeforces Round #310 (Div. 2) 4
92 Circular RMQ Categories Codeforces Codeforces Testing Round #1 4
93 String Manipulation 1.0 Categories Codeforces VK Cup 2012 Qualification Round 2 4
94 XOR on Segment Categories Codeforces Codeforces Round #149 (Div. 2) 4
95 New Year Snowmen Categories Codeforces Codeforces Round #100 4
96 Queue Categories Codeforces Codeforces Beta Round #75 (Div. 1 Only) & Codeforces Beta Round #75 (Div. 2 Only) 4
97 Remove Extra One Categories Codeforces Codeforces Round #450 (Div. 2) 4
98 Ice-cream Tycoon Categories SGU 4
99 Enemy is weak Categories Codeforces Codeforces Beta Round #57 (Div. 2) 4
100 Predict Outcome of the Game Categories Codeforces Codeforces Round #258 (Div. 2) 4
101 Vessels Categories Codeforces Codeforces Round #218 (Div. 2) 4
102 Arthur and Table Categories Codeforces Codeforces Round #311 (Div. 2) 4
103 Ant colony Categories Codeforces Codeforces Round #271 (Div. 2) 4
104 Longest k-Good Segment Categories Codeforces Educational Codeforces Round 5 4
105 Maximum Submatrix 2 Categories Codeforces Codeforces Round #221 (Div. 1) & Codeforces Round #221 (Div. 2) 4
106 Anagram Search Categories Codeforces Codeforces Round #103 (Div. 2) 4
107 Xenia and Tree Categories Codeforces Codeforces Round #199 (Div. 2) 4
108 Lazy Student Categories Codeforces Codeforces Round #335 (Div. 1) & Codeforces Round #335 (Div. 2) 4
109 SBE201 Linked List Categories SPOJ 4
110 Processing Queries Categories Codeforces CROC 2016 - Qualification 4
111 Find Pair Categories Codeforces Codeforces Round #111 (Div. 2) 4
112 XOR and Favorite Number Categories Codeforces Codeforces Round #340 (Div. 2) 4
113 Babaei and Birthday Cake Categories Codeforces Codeforces Round #343 (Div. 2) 4
114 Clique Problem Categories Codeforces Codeforces Round #296 (Div. 2) & Codeforces Round #296 (Div. 1) 4
115 Drazil and Tiles Categories Codeforces Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) 4
116 Money Transfers Categories Codeforces Codeforces Round #353 (Div. 2) 4
117 Ada and List Categories SPOJ 4
118 One-Dimensional Battle Ships Categories Codeforces Codeforces Round #Pi (Div. 2) 4
119 After Training Categories Codeforces Codeforces Round #123 (Div. 2) 4
120 Psychos in a Line Categories Codeforces Codeforces Round #189 (Div. 1) & Codeforces Round #189 (Div. 2) 4
121 Friends or Not Categories Codeforces VK Cup 2012 Qualification Round 2 4
122 Report Categories Codeforces Codeforces Round #344 (Div. 2) 4
123 Planets Categories Codeforces Codeforces Round #142 (Div. 1) & Codeforces Round #142 (Div. 2) 4
124 Petya and Divisors Categories Codeforces Codeforces Beta Round #85 (Div. 1 Only) & Codeforces Beta Round #85 (Div. 2 Only) 4
125 A and B and Lecture Rooms Categories Codeforces Codeforces Round #294 (Div. 2) 4
126 Little Elephant and Cards Categories Codeforces Codeforces Round #129 (Div. 1) & Codeforces Round #129 (Div. 2) 4
127 Tree Construction Categories Codeforces Codeforces Round #353 (Div. 2) 4
128 Vanya and Triangles Categories Codeforces Codeforces Round #308 (Div. 2) 4
129 Maximum Xor Secondary Categories Codeforces Codeforces Round #172 (Div. 1) & Codeforces Round #172 (Div. 2) 5
130 Suspects Categories Codeforces Codeforces Round #110 (Div. 1) & Codeforces Round #110 (Div. 2) 5
131 Tricky Function Categories Codeforces Codeforces Round #245 (Div. 1) 5
132 Colorful Field Categories Codeforces Codeforces Beta Round #71 5
133 Friends and Subsequences Categories Codeforces Codeforces Round #361 (Div. 2) 5
134 A Simple Task Categories Codeforces Codeforces Round #312 (Div. 2) 5
135 New Year Tree Categories Codeforces Educational Codeforces Round 6 5
136 Text Editor Categories Codeforces Codeforces Round #154 (Div. 2) 5
137 Minimum spanning tree for each edge Categories Codeforces Educational Codeforces Round 3 5
138 Petr# Categories Codeforces Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) 5
139 Duff in the Army Categories Codeforces Codeforces Round #326 (Div. 1) & Codeforces Round #326 (Div. 2) 5
140 Misha and Permutations Summation Categories Codeforces Codeforces Round #285 (Div. 2) & Codeforces Round #285 (Div. 1) 5
141 Mahmoud and a Dictionary Categories Codeforces Codeforces Round #396 (Div. 2) 5
142 Strip Categories Codeforces Codeforces Round #278 (Div. 1) & Codeforces Round #278 (Div. 2) 5
143 Factory Repairs Categories Codeforces 8VC Venture Cup 2016 - Final Round 5
144 Case of Chocolate Categories Codeforces Codeforces Round #310 (Div. 1) & Codeforces Round #310 (Div. 2) 5
145 Pillars Categories Codeforces Codeforces Round #271 (Div. 2) 5
146 Exposition Categories Codeforces Codeforces Beta Round #6 (Div. 2 Only) 5
147 Mishka and Interesting sum Categories Codeforces Codeforces Round #365 (Div. 2) 5
148 Little Artem and Time Machine Categories Codeforces VK Cup 2016 - Round 2 5
149 Connected Components Categories Codeforces Croc Champ 2013 - Round 1 5
150 The Bakery Categories Codeforces Codeforces Round #426 (Div. 1) & Codeforces Round #426 (Div. 2) 5
151 Handshakes Categories Codeforces Codeforces Round #298 (Div. 2) 5
152 Cartons of milk Categories Codeforces Codeforces Round #398 (Div. 2) 5
153 Statistics of Recompressing Videos Categories Codeforces VK Cup 2015 - Qualification Round 2 5
154 Blood Cousins Categories Codeforces Codeforces Round #130 (Div. 2) 5
155 Mail Stamps Categories Codeforces Codeforces Beta Round #29 (Div. 2, Codeforces format) 5
156 Vitya and Strange Lesson Categories Codeforces Codeforces Round #430 (Div. 2) 5
157 Copying Data Categories Codeforces Croc Champ 2013 - Round 1 5
158 Spy Syndrome 2 Categories Codeforces Manthan, Codefest 16 5
159 Leaving Auction Categories Codeforces Codeforces Round #388 (Div. 2) 5
160 Nested Segments Categories Codeforces Educational Codeforces Round 10 5
161 Lipshitz Sequence Categories Codeforces Codeforces Round #333 (Div. 1) & Codeforces Round #333 (Div. 2) 5
162 Running with Obstacles Categories Codeforces VK Cup 2016 - Qualification Round 1 5
163 CGCDSSQ Categories Codeforces Bayan 2015 Contest Warm Up 5
164 Tree and Queries Categories Codeforces Codeforces Round #221 (Div. 1) 5
165 Sausage Maximization Categories Codeforces Codeforces Round #173 (Div. 2) 5
166 Missile Silos Categories Codeforces Codeforces Round #103 (Div. 2) 5
167 Water Tree Categories Codeforces Codeforces Round #200 (Div. 1) 5
168 Bracket Sequence Categories Codeforces Codeforces Round #138 (Div. 1) & Codeforces Round #138 (Div. 2) 5
169 Sereja ans Anagrams Categories Codeforces Codeforces Round #215 (Div. 1) & Codeforces Round #215 (Div. 2) 5
170 The Child and Sequence Categories Codeforces Codeforces Round #250 (Div. 1) 5
171 Maxim and Array Categories Codeforces Codeforces Round #374 (Div. 2) 5
172 R2D2 and Droid Army Categories Codeforces Codeforces Round #291 (Div. 2) 5
173 Hanoi Factory Categories Codeforces Codeforces Round #401 (Div. 2) 5
174 Subsegments Categories Codeforces Codeforces Beta Round #63 (Div. 2) 5
175 Unordered Subsequence Categories Codeforces Codeforces Beta Round #27 (Codeforces format, Div. 2) 5
176 Kay and Snowflake Categories Codeforces Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2) 5
177 Persistent Bookcase Categories Codeforces Codeforces Round #368 (Div. 2) 5
178 Cards Sorting Categories Codeforces Codeforces Round #424 (Div. 1, rated, based on VK Cup Finals) & Codeforces Round #424 (Div. 2, rated, based on VK Cup Finals) 5
179 Preparing for the Contest Categories Codeforces Codeforces Round #222 (Div. 1) & Codeforces Round #222 (Div. 2) 5
180 Fedor and coupons Categories Codeforces Codeforces Round #390 (Div. 2) 5
181 Arthur and Walls Categories Codeforces Codeforces Round #297 (Div. 2) 6
182 Hiring Categories Codeforces 2015-2016 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) 6
183 Drazil and Park Categories Codeforces Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) 6
184 Shortest Path Categories A2 Online Judge 6
185 Two Strings Categories Codeforces Codeforces Round #138 (Div. 1) & Codeforces Round #138 (Div. 2) 6
186 Messenger Categories Codeforces Codeforces Round #344 (Div. 2) 6
187 Valera and Queries Categories Codeforces Codeforces Round #216 (Div. 2) 6
188 Sum of Medians Categories Codeforces Yandex.Algorithm 2011 Round 1 6
189 Closest Equals Categories Codeforces VK Cup 2015 - Qualification Round 1 6
190 Summer Homework Categories Codeforces ABBYY Cup 3.0 6
191 Rooter's Song Categories Codeforces Codeforces Round #431 (Div. 1) & Codeforces Round #431 (Div. 2) 6
192 Infinite Inversions Categories Codeforces Codeforces Round #301 (Div. 2) 6
193 Ciel and Gondolas Categories Codeforces Codeforces Round #190 (Div. 1) 6
194 Trains and Statistic Categories Codeforces Codeforces Round #353 (Div. 2) 6
195 Beaver Categories Codeforces Codeforces Beta Round #71 6
196 Restructuring Company Categories Codeforces VK Cup 2015 - Finals, online mirror 6
197 New Year Tree Categories Codeforces Good Bye 2013 6
198 Legacy Categories Codeforces Codeforces Round #406 (Div. 1) & Codeforces Round #406 (Div. 2) 6
199 On Changing Tree Categories Codeforces Codeforces Round #232 (Div. 1) & Codeforces Round #232 (Div. 2) 6
200 Appleman and a Sheet of Paper Categories Codeforces Codeforces Round #263 (Div. 1) & Codeforces Round #263 (Div. 2) 6
201 Lucky Queries Categories Codeforces Codeforces Round #104 (Div. 1) 6
202 Insertion Sort Categories Codeforces Codeforces Round #212 (Div. 2) 6
203 DZY Loves Colors Categories Codeforces Codeforces Round #254 (Div. 1) & Codeforces Round #254 (Div. 2) 6
204 Subsequences Categories Codeforces Testing Round #12 6
205 Mahmoud and a xor trip Categories Codeforces Codeforces Round #396 (Div. 2) 6
206 Mister B and PR Shifts Categories Codeforces Codeforces Round #421 (Div. 1) & Codeforces Round #421 (Div. 2) 6
207 Serega and Fun Categories Codeforces Codeforces Round #260 (Div. 1) 6
208 Buses Categories Codeforces Codeforces Beta Round #79 (Div. 1 Only) & Codeforces Beta Round #79 (Div. 2 Only) 6
209 Hydra Categories Codeforces Codeforces Round #150 (Div. 1) & Codeforces Round #150 (Div. 2) 6
210 Vanya and Treasure Categories Codeforces Codeforces Round #355 (Div. 2) 6
211 New Year Domino Categories Codeforces Good Bye 2014 6
212 Kindergarten Categories Codeforces Codeforces Round #276 (Div. 1) 6
213 Watching Fireworks is Fun Categories Codeforces Codeforces Round #219 (Div. 1) & Codeforces Round #219 (Div. 2) 6
214 Boredom Categories Codeforces Codeforces Round #433 (Div. 1, based on Olympiad of Metropolises) & Codeforces Round #433 (Div. 2, based on Olympiad of Metropolises) 6
215 DZY Loves Fibonacci Numbers Categories Codeforces Codeforces Round #255 (Div. 1) & Codeforces Round #255 (Div. 2) 6
216 Yaroslav and Divisors Categories Codeforces Codeforces Round #182 (Div. 1) 6
217 Mike and Geometry Problem Categories Codeforces Codeforces Round #361 (Div. 2) 6
218 Time to Raid Cowavans Categories Codeforces Codeforces Beta Round #80 (Div. 1 Only) & Codeforces Beta Round #80 (Div. 2 Only) 6
219 Holes Categories Codeforces Codeforces Beta Round #13 6
220 Oh Sweet Beaverette Categories Codeforces ABBYY Cup 3.0 - Finals (online version) 6
221 Sereja and Subsequences Categories Codeforces Codeforces Round #187 (Div. 1) & Codeforces Round #187 (Div. 2) 6
222 GukiZ and GukiZiana Categories Codeforces Codeforces Round #307 (Div. 2) 6
223 Leha and another game about graph Categories Codeforces Codeforces Round #429 (Div. 1) & Codeforces Round #429 (Div. 2) 6
224 A Heap of Heaps Categories Codeforces Codeforces Round #300 6
225 Cubes Categories Codeforces Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) 6
226 Kefa and Watch Categories Codeforces Codeforces Round #321 (Div. 2) 6
227 Artem and Array Categories Codeforces Codeforces Round #253 (Div. 1) 6
228 LIS of Sequence Categories Codeforces Codeforces Round #277 (Div. 2) 6
229 New Year and Three Musketeers Categories Codeforces Good Bye 2015 7
230 Inna and Sequence Categories Codeforces Codeforces Round #220 (Div. 2) 7
231 Spider's Web Categories Codeforces Codeforces Round #133 (Div. 2) 7
232 Mushroom Gnomes - 2 Categories Codeforces Codeforces Beta Round #99 (Div. 1) & Codeforces Beta Round #99 (Div. 2) 7
233 Big Maximum Sum Categories Codeforces Codeforces Beta Round #67 (Div. 2) 7
234 Bindian Signalizing Categories Codeforces Codeforces Beta Round #5 7
235 Cats Transport Categories Codeforces Codeforces Round #185 (Div. 1) & Codeforces Round #185 (Div. 2) 7
236 Domino Principle Categories Codeforces Codeforces Beta Round #52 (Div. 2) 7
237 Garlands Categories Codeforces Codeforces Round #368 (Div. 2) 7
238 Till I Collapse Categories Codeforces Codeforces Round #406 (Div. 1) & Codeforces Round #406 (Div. 2) 7
239 Zip-line Categories Codeforces Codeforces Round #345 (Div. 1) 7
240 Anton and Permutation Categories Codeforces Codeforces Round #404 (Div. 2) 7
241 Beer Machines Categories SPOJ 7
242 Package Delivery Categories Codeforces 8VC Venture Cup 2016 - Final Round 7
243 Iahub and Xors Categories Codeforces Codeforces Round #198 (Div. 1) 7
244 Happy Tree Party Categories Codeforces Codeforces Round #329 (Div. 2) 7
245 Dima and Trap Graph Categories Codeforces Codeforces Round #214 (Div. 2) 7
246 Traffic Jams in the Land Categories Codeforces Codeforces Round #284 (Div. 1) 7
247 Beard Graph Categories Codeforces Codeforces Round #112 (Div. 2) 7
248 Product Sum Categories Codeforces Codeforces Round #344 (Div. 2) 7
249 Blood Cousins Return Categories Codeforces Codeforces Round #151 (Div. 2) 7
250 Beautiful Subarrays Categories Codeforces Educational Codeforces Round 12 7
251 Points Categories Codeforces Codeforces Beta Round #19 7
252 Sereja and Two Sequences Categories Codeforces Codeforces Round #243 (Div. 1) & Codeforces Round #243 (Div. 2) 7
253 George and Cards Categories Codeforces Codeforces Round #227 (Div. 2) 7
254 Little Elephant and Tree Categories Codeforces Codeforces Round #157 (Div. 1) 7
255 Zebra Tower Categories Codeforces VK Cup 2012 Qualification Round 2 7
256 Corporation Mail Categories Codeforces Codeforces Beta Round #52 (Div. 2) 7
257 Ball Categories Codeforces Codeforces Beta Round #12 (Div 2 Only) 7
258 Bug in Code Categories Codeforces Coder-Strike 2014 - Finals (online edition, Div. 2) & Coder-Strike 2014 - Finals (online edition, Div. 1) & Coder-Strike 2014 - Finals (online edition, Div. 2) & Coder-Strike 2014 - Finals (online edition, Div. 1) 7
259 The Untended Antiquity Categories Codeforces Codeforces Round #439 (Div. 2) 7
260 Vika and Segments Categories Codeforces Codeforces Round #337 (Div. 2) 7
261 Parking Lot Categories Codeforces School Personal Contest #2 (Winter Computer School 2010/11) - Codeforces Beta Round #43 (ACM-ICPC Rules) 7
262 Rooks and Rectangles Categories Codeforces VK Cup 2015 - Round 1 7
263 Lucky Array Categories Codeforces Codeforces Beta Round #91 (Div. 1 Only) 7
264 Sereja and Squares Categories Codeforces Codeforces Round #243 (Div. 1) 7
265 Students' Revenge Categories Codeforces Codeforces Round #193 (Div. 2) 7
266 Petya and File System Categories Codeforces Codeforces Beta Round #61 (Div. 2) 7
267 Fools and Foolproof Roads Categories Codeforces Codeforces Round #212 (Div. 2) 7
268 Little Elephant and Shifts Categories Codeforces Codeforces Round #136 (Div. 1) & Codeforces Round #136 (Div. 2) 7
269 Ada and Mulberry Categories SPOJ 7
270 Working routine Categories Codeforces Codeforces Round #367 (Div. 2) 7
271 Ann and Half-Palindrome Categories Codeforces Codeforces Round #311 (Div. 2) 7
272 Alyona and towers Categories Codeforces Codeforces Round #381 (Div. 1) & Codeforces Round #381 (Div. 2) 7
273 Old Berland Language Categories Codeforces Codeforces Beta Round #37 7
274 General Mobilization Categories Codeforces Yandex.Algorithm 2011 Qualification 2 7
275 Hostname Aliases Categories Codeforces CROC 2016 - Qualification 7
276 Optical Experiment Categories Codeforces Manthan 2011 7
277 Sign on Fence Categories Codeforces Codeforces Round #276 (Div. 1) 7
278 Maximum Questions Categories Codeforces Codeforces Round #450 (Div. 2) 7
279 Inna and Binary Logic Categories Codeforces Codeforces Round #234 (Div. 2) 7
280 Little Girl and Problem on Trees Categories Codeforces Codeforces Round #169 (Div. 2) 7
281 Comb Categories Codeforces School Personal Contest #2 (Winter Computer School 2010/11) - Codeforces Beta Round #43 (ACM-ICPC Rules) 7
282 Last Chance Categories Codeforces Codeforces Beta Round #98 (Div. 2) 7
283 Acyclic Organic Compounds Categories Codeforces Codeforces Round #333 (Div. 1) 7
284 Ski Base Categories Codeforces Codeforces Beta Round #75 (Div. 1 Only) & Codeforces Beta Round #75 (Div. 2 Only) 7
285 Bear and Contribution Categories Codeforces VK Cup 2016 - Round 1 7
286 Treeland Tour Categories Codeforces Codeforces Round #279 (Div. 2) 7
287 Little Elephant and Inversions Categories Codeforces Codeforces Round #136 (Div. 1) 7
288 Guess Your Way Out! II Categories Codeforces Codeforces Round #312 (Div. 2) 7
289 Encrypting Messages Categories Codeforces ABBYY Cup 2.0 - Easy 7
290 Envy Categories Codeforces Codeforces Round #446 (Div. 1) & Codeforces Round #446 (Div. 2) 7
291 Subset Sums Categories Codeforces Codeforces Round #202 (Div. 1) & Codeforces Round #202 (Div. 2) 7
292 Embassy Queue Categories Codeforces Yandex.Algorithm 2011 Round 1 7
293 Cactus Categories Codeforces Codeforces Round #143 (Div. 2) 7
294 Bug in Code Categories Codeforces Coder-Strike 2014 - Finals (online edition, Div. 2) & Coder-Strike 2014 - Finals (online edition, Div. 1) & Coder-Strike 2014 - Finals (online edition, Div. 2) & Coder-Strike 2014 - Finals (online edition, Div. 1) 7
295 Ralph And His Tour in Binary Country Categories Codeforces Codeforces Round #447 (Div. 2) 7
296 Counter Attack Categories Codeforces Codeforces Round #120 (Div. 2) 7
297 Crayon Categories SPOJ 7
298 Range Increments Categories Codeforces VK Cup 2012 Round 3 (Unofficial Div. 2 Edition) 7
299 Goodbye Souvenir Categories Codeforces Codeforces Round #431 (Div. 1) & Codeforces Round #431 (Div. 2) 8
300 Permutation Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 8
301 Igloo Skyscraper Categories Codeforces Codeforces Beta Round #75 (Div. 1 Only) 8
302 Don't fear, DravDe is kind Categories Codeforces Codeforces Beta Round #28 (Codeforces format) 8
303 Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths Categories Codeforces Codeforces Round #383 (Div. 1) 8
304 Inversions After Shuffle Categories Codeforces Codeforces Round #388 (Div. 2) 8
305 Birthday Categories Codeforces Codeforces Round #282 (Div. 1) 8
306 Building Forest Categories Codeforces Codeforces Round #123 (Div. 2) 8
307 e-Government Categories Codeforces VK Cup 2012 Round 2 8
308 Developing Game Categories Codeforces Codeforces Round #222 (Div. 1) 8
309 Optimal Sum Categories Codeforces Codeforces Round #117 (Div. 2) 8
310 REQ Categories Codeforces Codeforces Round #330 (Div. 1) 8
311 Little Elephant and Strings Categories Codeforces Codeforces Round #129 (Div. 1) 8
312 Linear Kingdom Races Categories Codeforces Codeforces Beta Round #87 (Div. 1 Only) 8
313 Biathlon Track Categories Codeforces Codeforces Round #242 (Div. 2) 8
314 Adam and Tree Categories Codeforces Codeforces Round #253 (Div. 1) 8
315 Yaroslav and Points Categories Codeforces Codeforces Round #179 (Div. 1) 8
316 Memory and Casinos Categories Codeforces Codeforces Round #370 (Div. 2) 8
317 Lucky Tickets Categories Codeforces Codeforces Beta Round #64 8
318 k-Maximum Subsequence Sum Categories Codeforces Codeforces Round #172 (Div. 1) 8
319 Destiny Categories Codeforces Codeforces Round #429 (Div. 1) 8
320 Lucky Arrays Categories Codeforces Codeforces Round #156 (Div. 1) 8
321 Pudding Monsters Categories Codeforces ZeptoLab Code Rush 2015 8
322 Bear and Bowling 4 Categories Codeforces Educational Codeforces Round 11 8
323 Tricky and Clever Password Categories Codeforces Codeforces Beta Round #30 (Codeforces format) 8
324 Cardboard Box Categories Codeforces Zepto Code Rush 2014 8
325 Anniversary Categories Codeforces Codeforces Round #140 (Div. 1) & Codeforces Round #140 (Div. 2) 8
326 Vladik and Entertaining Flags Categories Codeforces Codeforces Round #416 (Div. 2) 8
327 Mike and Friends Categories Codeforces Codeforces Round #305 (Div. 1) 8
328 Frogs and mosquitoes Categories Codeforces Educational Codeforces Round 3 8
329 Dancing Lessons Categories Codeforces School Team Contest #3 (Winter Computer School 2010/11) 8
330 Jeff and Removing Periods Categories Codeforces Codeforces Round #204 (Div. 1) 8
331 Thwarting Demonstrations Categories Codeforces Codeforces Round #121 (Div. 1) 8
332 Roads in Yusland Categories Codeforces Codeforces Round #352 (Div. 1) 8
333 Professor's task Categories Codeforces Codeforces Beta Round #64 8
334 Conveyor Belts Categories Codeforces Codeforces Round #278 (Div. 1) 8
335 Dividing Kingdom II Categories Codeforces Codeforces Round #360 (Div. 1) 8
336 Zbazi in Zeydabad Categories Codeforces Educational Codeforces Round 8 8
337 Place Your Ad Here Categories Codeforces VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) 8
338 Alex and Complicated Task Categories Codeforces Codeforces Round #267 (Div. 2) 8
339 More Queries to Array... Categories Codeforces Codeforces Round #163 (Div. 2) 8
340 Parade Categories Codeforces Codeforces Beta Round #35 (Div. 2) 8
341 Ultimate Weirdness of an Array Categories Codeforces Codeforces Round #352 (Div. 1) & Codeforces Round #352 (Div. 2) 8
342 Interval Cubing Categories Codeforces Codeforces Round #185 (Div. 1) 8
343 Petya and Post Categories Codeforces Codeforces Beta Round #61 (Div. 2) 8
344 Instant Messanger Categories Codeforces Codeforces Round #233 (Div. 1) 8
345 Ilya and Two Numbers Categories Codeforces Codeforces Round #186 (Div. 2) 8
346 Yura and Developers Categories Codeforces Looksery Cup 2015 8
347 Animals and Puzzle Categories Codeforces Codeforces Round #371 (Div. 1) 8
348 Smart Cheater Categories Codeforces Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) 8
349 TorCoder Categories Codeforces Codeforces Round #145 (Div. 1, ACM-ICPC Rules) 8
350 Chip Play Categories Codeforces Codeforces Beta Round #74 (Div. 1 Only) & Codeforces Beta Round #74 (Div. 2 Only) 8
351 Mashmokh and Water Tanks Categories Codeforces Codeforces Round #240 (Div. 1) 8
352 Summer Homework Categories Codeforces ABBYY Cup 3.0 8
353 Kay and Eternity Categories Codeforces Codeforces Round #359 (Div. 1) 8
354 Tourists Categories Codeforces Codeforces Round #278 (Div. 1) 8
355 Inna and Candy Boxes Categories Codeforces Codeforces Round #229 (Div. 2) 8
356 Archaeology Categories Codeforces Croc Champ 2012 - Round 2 8
357 Board Game Categories Codeforces Codeforces Round #335 (Div. 1) 8
358 Parking Lot Categories Codeforces Codeforces Round #135 (Div. 2) 8
359 Cinema Categories Codeforces Codeforces Round #126 (Div. 2) 8
360 Cup Trick Categories Codeforces Coder-Strike 2014 - Finals (online edition, Div. 1) & Coder-Strike 2014 - Finals (online edition, Div. 2) 8
361 Close Vertices Categories Codeforces Croc Champ 2013 - Round 2 8
362 Startup Funding Categories Codeforces Manthan, Codefest 16 8
363 Alphabet Permutations Categories Codeforces Codeforces Round #337 (Div. 2) 8
364 Choosing Subtree is Fun Categories Codeforces Codeforces Round #219 (Div. 1) 8
365 Tournament Categories Codeforces Codeforces Round #443 (Div. 1) & Codeforces Round #443 (Div. 2) 8
366 Printer Categories Codeforces Codeforces Round #154 (Div. 2) 8
367 Two Permutations Categories Codeforces Codeforces Round #131 (Div. 1) 8
368 Paper task Categories Codeforces IndiaHacks 2016 - Online Edition (Div. 1 + Div. 2) 8
369 Optimize! Categories Codeforces Codeforces Round #196 (Div. 1) 8
370 Three strings Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 8
371 Eyes Closed Categories Codeforces Codeforces Round #448 (Div. 2) 8
372 Tourist Categories Codeforces All-Ukrainian School Olympiad in Informatics 8
373 Robot Arm Categories Codeforces Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) 8
374 Cow Tennis Tournament Categories Codeforces Codeforces Round #174 (Div. 1) 8
375 Power Tree Categories Codeforces Codeforces Round #336 (Div. 1) 8
376 Queue Categories Codeforces School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round #38 (ACM-ICPC Rules) 8
377 Competition Categories Codeforces Codeforces Round #103 (Div. 2) 8
378 Shave Beaver! Categories Codeforces ABBYY Cup 3.0 - Finals (online version) 8
379 Yash And Trees Categories Codeforces Manthan, Codefest 16 8
380 Sereja and Straight Lines Categories Codeforces Codeforces Round #187 (Div. 1) 8
381 Cannon Categories Codeforces Codeforces Beta Round #44 (Div. 2) 9
382 Design Tutorial: Increase the Constraints Categories Codeforces Codeforces Round #270 9
383 A Museum Robbery Categories Codeforces Codeforces Round #333 (Div. 1) 9
384 Big Problems for Organizers Categories Codeforces RCC 2014 Warmup (Div. 1) 9
385 Ping-Pong Categories Codeforces Codeforces Round #189 (Div. 1) 9
386 Bear and Cavalry Categories Codeforces Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) 9
387 Tourists Categories Codeforces Codeforces Round #176 (Div. 1) 9
388 Karen and Cards Categories Codeforces Codeforces Round #419 (Div. 1) 9
389 Lucky Pair Categories Codeforces Codeforces Round #104 (Div. 1) 9
390 Fence Categories Codeforces Codeforces Round #144 (Div. 1) 9
391 Fibonacci-ish II Categories Codeforces Manthan, Codefest 16 9
392 k-d-sequence Categories Codeforces Codeforces Round #239 (Div. 1) 9
393 Roadside Trees Categories Codeforces Codeforces Round #162 (Div. 1) 9
394 Alien DNA Categories Codeforces Codeforces Round #134 (Div. 1) 9
395 Chemistry Experiment Categories Codeforces Codeforces Round #247 (Div. 2) 9
396 Little Pony and Lord Tirek Categories Codeforces Codeforces Round #259 (Div. 1) 9
397 Pastoral Oddities Categories Codeforces Codeforces Round #334 (Div. 1) 9
398 Timofey and a flat tree Categories Codeforces Codeforces Round #395 (Div. 1) 9
399 Forensic Examination Categories Codeforces Codeforces Round #349 (Div. 1) 9
400 The Next Good String Categories Codeforces Codeforces Round #124 (Div. 1) 9
401 Fetch the Treasure Categories Codeforces Codeforces Round #185 (Div. 1) & Codeforces Round #185 (Div. 2) 9
402 Parking Lot Categories Codeforces Codeforces Round #274 (Div. 1) 9
403 Xors on Segments Categories Codeforces Educational Codeforces Round 6 9
404 Greedy Elevator Categories Codeforces Codeforces Round #159 (Div. 2) 9
405 Mirror Room Categories Codeforces Codeforces Round #168 (Div. 1) 9
406 Hitchhiking in the Baltic States Categories Codeforces Codeforces Round #415 (Div. 1) 9
407 Welcome home, Chtholly Categories Codeforces Codeforces Round #449 (Div. 1) 9
408 Constrained Tree Categories Codeforces Rockethon 2015 9
409 Clockwork Bomb Categories Codeforces Codeforces Round #345 (Div. 1) 9
410 Bear and Bad Powers of 42 Categories Codeforces Codeforces Round #356 (Div. 1) 9
411 Duff as a Queen Categories Codeforces Codeforces Round #326 (Div. 1) 9
412 Maze 2D Categories Codeforces Coder-Strike 2014 - Round 2 9
413 Summer Homework Categories Codeforces ABBYY Cup 3.0 9
414 Mike and code of a permutation Categories Codeforces Codeforces Round #410 (Div. 2) 9
415 Maximum Waterfall Categories Codeforces Codeforces Round #165 (Div. 1) 9
416 Noble Knight's Path Categories Codeforces Codeforces Round #140 (Div. 1) 9
417 Gripping Story Categories Codeforces Codeforces Round #125 (Div. 1) 9
418 Two permutations Categories Codeforces Testing Round #7 9
419 BRT Contract Categories Codeforces Codeforces Round #119 (Div. 1) 9
420 Dividing Kingdom Categories Codeforces Codeforces Round #158 (Div. 2) 9
421 Tavas on the Path Categories Codeforces Codeforces Round #299 (Div. 1) 9
422 Donkey and Stars Categories Codeforces Codeforces Round #152 (Div. 1) 9
423 The Classic Problem Categories Codeforces Codeforces Round #265 (Div. 1) 9
424 Huffman Coding on Segment Categories Codeforces Codeforces Round #364 (Div. 1) 9
425 Cutting a Fence Categories Codeforces VK Cup 2012 Finals (unofficial online-version) 9
426 Two Segments Categories Codeforces Codeforces Round #122 (Div. 1) 9
427 Hanger Categories Codeforces Codeforces Beta Round #68 9
428 Function Categories Codeforces Codeforces Round #260 (Div. 1) 9
429 Zigzag Categories Codeforces Codeforces Round #141 (Div. 2) 9
430 Sereja and Dividing Categories Codeforces Codeforces Round #223 (Div. 1) 9
431 Camping Groups Categories Codeforces Croc Champ 2012 - Round 1 9
432 Rhombus Categories Codeforces Codeforces Round #161 (Div. 2) 9
433 Freezing with Style Categories Codeforces Codeforces Round #107 (Div. 1) 9
434 And Yet Another Bracket Sequence Categories Codeforces VK Cup 2015 - Round 1 9
435 Friends Categories Codeforces Bayan 2012-2013 Elimination Round (ACM ICPC Rules, English statements) 9
436 Polycarp's Masterpiece Categories Codeforces 2015-2016 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) 9
437 Optimizer Categories Codeforces Testing Round #6 9
438 Buses and People Categories Codeforces Codeforces Round #111 (Div. 2) 9
439 Arkady and a Nobody-men Categories Codeforces Codeforces Round #434 (Div. 1, based on Technocup 2018 Elimination Round 1) 9
440 Map Categories Codeforces Codeforces Beta Round #15 9
441 Raffles Categories Codeforces 8VC Venture Cup 2016 - Elimination Round 9
442 Half-decay tree Categories Codeforces Codeforces Beta Round #62 9
443 Summer Dichotomy Categories Codeforces Codeforces Round #300 10
444 Bear and Chemistry Categories Codeforces VK Cup 2016 - Round 1 10
445 Organizing a Race Categories Codeforces Codeforces Round #352 (Div. 1) 10
446 Dreamoon and Notepad Categories Codeforces Codeforces Round #272 (Div. 1) 10
447 Three Arrays Categories Codeforces Codeforces Round #230 (Div. 1) 10
448 Shooting Gallery Categories Codeforces School Team Contest #2 (Winter Computer School 2010/11) 10
449 Landmarks Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 10
450 Stack Categories Codeforces Surprise Language Round #6 10
451 Rap God Categories Codeforces Codeforces Round #406 (Div. 1) 10
452 Escaping on Beaveractor Categories Codeforces ABBYY Cup 3.0 - Finals (online version) 10
453 Gnomes of Might and Magic Categories Codeforces Codeforces Round #115 10
454 Inna and Babies Categories Codeforces Codeforces Round #220 (Div. 2) 10
455 MUH and Lots and Lots of Segments Categories Codeforces Codeforces Round #269 (Div. 2) 10
456 Name the album Categories Codeforces Unknown Language Round #3 10
457 Tricky Password Categories Codeforces RCC 2014 Warmup (Div. 1) 10
458 Robots protection Categories Codeforces Bubble Cup 8 - Finals [Online Mirror] 10
459 ELCA Categories Codeforces Codeforces Round #275 (Div. 1) 10
460 Soap Time! - 2 Categories Codeforces Codeforces Round #118 (Div. 1) 10
461 Tape Programming Categories Codeforces Codeforces Round #148 (Div. 1) 10
462 Tree or not Tree Categories Codeforces Codeforces Beta Round #88 10
463 Mystic Carvings Categories Codeforces Codeforces Round #180 (Div. 1) 10
464 Campus Categories Codeforces Codeforces Round #317 [AimFund Thanks-Round] (Div. 1) 10
465 Sequence Transformation Categories Codeforces Codeforces Round #172 (Div. 1) 10
466 Game with Two Trees Categories Codeforces Abbyy Cup 2.0 - Final (unofficial) 10
467 Red-Black Cobweb Categories Codeforces Codeforces Round #426 (Div. 1) 10
468 Banners Categories Codeforces Zepto Code Rush 2014 10
469 Painting Edges Categories Codeforces Codeforces Round #319 (Div. 1) 10
470 Caramel Clouds Categories Codeforces Codeforces Round #426 (Div. 1) 10
471 Wizards and Roads Categories Codeforces Codeforces Round #114 (Div. 1) 10
472 Duff is Mad Categories Codeforces Codeforces Round #326 (Div. 1) 10
473 Duck Hunt Categories Codeforces VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) 10
474 New task Categories Codeforces Codeforces Round #407 (Div. 1) 10
475 Cubes Categories Codeforces Codeforces Round #150 (Div. 1) 10
476 Lada Malina Categories Codeforces Codeforces Round #433 (Div. 1, based on Olympiad of Metropolises) 10
477 Frog Fights Categories Codeforces Codeforces Round #342 (Div. 2) 10
478 Heaven Tour Categories Codeforces Codeforces Round #119 (Div. 1) 10
479 ALT Categories Codeforces Codeforces Round #406 (Div. 1) 10
480 Two Circles Categories Codeforces Codeforces Round #211 (Div. 2) 10
481 Mashmokh's Designed Problem Categories Codeforces Codeforces Round #240 (Div. 1) 10
482 Listening to Music Categories Codeforces Codeforces Round #302 (Div. 1) 10
483 Meta-universe Categories Codeforces Bayan 2015 Contest Warm Up 10
484 Supercollider Categories Codeforces Rockethon 2014 10
485 Berland Miners Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 10
486 Matrix Categories Codeforces Codeforces Round #150 (Div. 1) 10
487 Arpa’s abnormal DNA and Mehrdad’s deep interest Categories Codeforces Codeforces Round #383 (Div. 1) 10
488 Two Rooted Trees Categories Codeforces Codeforces Round #236 (Div. 1) 10
489 Longest Increasing Subsequence Categories Codeforces Codeforces Round #315 (Div. 1) 10