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math problems
Problem Name Online Judge Year Contest Difficulty Level
1 Infinite Sequence Categories Codeforces Codeforces Round #353 (Div. 2) 1
2 Hello Categories A2 Online Judge 1
3 Dragons Categories Codeforces Codeforces Round #142 (Div. 2) 1
4 Fox and Number Game Categories Codeforces Codeforces Round #228 (Div. 2) 1
5 Professor GukiZ's Robot Categories Codeforces Educational Codeforces Round 6 1
6 Young Physicist Categories Codeforces Codeforces Beta Round #63 (Div. 2) 1
7 Insomnia cure Categories Codeforces Codeforces Round #105 (Div. 2) 1
8 Little Elephant and Bits Categories Codeforces Codeforces Round #157 (Div. 1) & Codeforces Round #157 (Div. 2) 1
9 Panoramix's Prediction Categories Codeforces Codeforces Beta Round #69 (Div. 2 Only) 1
10 Dreamoon and Stairs Categories Codeforces Codeforces Round #272 (Div. 2) 1
11 Average 2 Categories URI 1
12 Drazil and Factorial Categories Codeforces Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) 1
13 Jzzhu and Sequences Categories Codeforces Codeforces Round #257 (Div. 2) 1
14 Arpa’s hard exam and Mehrdad’s naive cheat Categories Codeforces Codeforces Round #383 (Div. 2) 1
15 Caisa and Pylons Categories Codeforces Codeforces Round #264 (Div. 2) 1
16 Perfect Permutation Categories Codeforces Codeforces Round #144 (Div. 2) 1
17 N-Factorful Categories SPOJ 1
18 Hashmat the Brave Warrior Categories UVA 1
19 Jeff and Digits Categories Codeforces Codeforces Round #204 (Div. 2) 1
20 Dima and Friends Categories Codeforces Codeforces Round #167 (Div. 2) 1
21 Amr and Pins Categories Codeforces Codeforces Round #287 (Div. 2) 1
22 Gerald's Hexagon Categories Codeforces Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) 1
23 Expression Categories Codeforces Codeforces Round #274 (Div. 2) 1
24 DDD Categories URI 1
25 Simple Equations Categories UVA 1
26 Touch of Venom Categories SPOJ 1
27 GCD Categories UVA 1
28 Sphere Categories URI 1
29 To Carry or not to Carry Categories UVA 1
30 Prime Distance Categories UVA 1
31 Godsend Categories Codeforces Codeforces Round #429 (Div. 2) 1
32 Theatre Square Categories Codeforces Codeforces Beta Round #1 1
33 Olesya and Rodion Categories Codeforces Codeforces Round #324 (Div. 2) 1
34 Game Categories Codeforces Rockethon 2015 1
35 Playing with Paper Categories Codeforces Codeforces Round #296 (Div. 2) 1
36 Calculating Function Categories Codeforces Codeforces Round #277 (Div. 2) 1
37 Sasha and Sticks Categories Codeforces Codeforces Round #425 (Div. 2) 1
38 Minimum Difficulty Categories Codeforces Codeforces Round #283 (Div. 2) 1
39 Cifera Categories Codeforces Codeforces Beta Round #86 (Div. 2 Only) 1
40 Play with Dates Categories SPOJ 1
41 Relational Operator Categories UVA 1
42 Tetrahedron Categories Codeforces Codeforces Round #113 (Div. 2) 1
43 Dreamoon and WiFi Categories Codeforces Codeforces Round #272 (Div. 2) 1
44 Simple Product Categories URI 1
45 A and B and Team Training Categories Codeforces Codeforces Round #294 (Div. 2) 1
46 Lovely Palindromes Categories Codeforces Codeforces Round #360 (Div. 2) 1
47 Triangle Categories Codeforces Codeforces Beta Round #6 (Div. 2 Only) 1
48 Watchmen Categories Codeforces Codeforces Round #345 (Div. 1) & Codeforces Round #345 (Div. 2) 1
49 Domino Categories Codeforces Codeforces Round #205 (Div. 2) 1
50 Initial Bet Categories Codeforces Codeforces Round #273 (Div. 2) 1
51 Wizards' Duel Categories Codeforces Codeforces Round #327 (Div. 2) 1
52 Two Buttons Categories Codeforces Codeforces Round #295 (Div. 2) 1
53 Vanya and Table Categories Codeforces Codeforces Round #308 (Div. 2) 1
54 Prime or Not Categories SPOJ 1
55 Soldier and Cards Categories Codeforces Codeforces Round #304 (Div. 2) 1
56 Vanya and Lanterns Categories Codeforces Codeforces Round #280 (Div. 2) 1
57 Vanya and Cards Categories Codeforces Codeforces Round #235 (Div. 2) 1
58 Vanya and Books Categories Codeforces Codeforces Round #308 (Div. 2) 1
59 Design Tutorial: Learn from Math Categories Codeforces Codeforces Round #270 1
60 Toy Army Categories Codeforces Codeforces Beta Round #72 (Div. 2 Only) 1
61 Area Categories URI 1
62 The Large Family Categories Live Archive 2013 South Pacific 1
63 Even Odds Categories Codeforces Codeforces Round #188 (Div. 2) 1
64 Meeting of Old Friends Categories Codeforces Codeforces Round #371 (Div. 2) 1
65 Playing With Balls Categories SPOJ 1
66 Spreadsheet Categories Codeforces Codeforces Beta Round #1 1
67 Duff in Love Categories Codeforces Codeforces Round #326 (Div. 2) 1
68 Maximum Clique Categories ZOJ 1
69 FANCY NUMBERS Categories SPOJ 1
70 Fancy Fence Categories Codeforces Codeforces Round #165 (Div. 2) 1
71 I'm bored with life Categories Codeforces Codeforces Round #422 (Div. 2) 1
72 Array fill I Categories URI 1
73 Kyoya and Photobooks Categories Codeforces Codeforces Round #309 (Div. 2) 1
74 Simple Calculate Categories URI 1
75 Simple Sum Categories URI 1
76 Fraction Categories Codeforces Codeforces Round #433 (Div. 2, based on Olympiad of Metropolises) 1
77 Fuel Spent Categories URI 1
78 New Year Candles Categories Codeforces Good Bye 2013 1
79 Clock Hands Categories UVA 1
80 Parallelepiped Categories Codeforces Codeforces Round #138 (Div. 2) 1
81 Vasya and Petya's Game Categories Codeforces Codeforces Round #319 (Div. 1) & Codeforces Round #319 (Div. 2) 1
82 Drinks Categories Codeforces Codeforces Round #126 (Div. 2) 1
83 The Monster and the Squirrel Categories Codeforces Codeforces Round #328 (Div. 2) 1
84 Round House Categories Codeforces Codeforces Round #346 (Div. 2) 1
85 Roommate Agreement Categories SPOJ 1
86 Salary with Bonus Categories URI 1
87 The Eternal Immortality Categories Codeforces Codeforces Round #439 (Div. 2) 1
88 Soldier and Bananas Categories Codeforces Codeforces Round #304 (Div. 2) 1
89 Simple Math Categories A2 Online Judge 1
90 Tricky Sum Categories Codeforces Educational Codeforces Round 1 1
91 Han Solo and Lazer Gun Categories Codeforces Codeforces Round #291 (Div. 2) 1
92 Anastasia and pebbles Categories Codeforces Codeforces Round #407 (Div. 2) 1
93 Fibonacci Numbers Categories TJU 1
94 T-primes Categories Codeforces Codeforces Round #142 (Div. 2) 1
95 Domino piling Categories Codeforces Codeforces Beta Round #47 1
96 Why this kolaveri di Categories SPOJ 1
97 Simple Game Categories Codeforces Codeforces Round #316 (Div. 2) 1
98 Prime Generator Categories SPOJ 1
99 Hungry Sequence Categories Codeforces Codeforces Round #191 (Div. 2) 1
100 Double Cola Categories Codeforces Yandex.Algorithm 2011 Qualification 2 1
101 Chips Categories Codeforces Codeforces Beta Round #75 (Div. 2 Only) 1
102 The Monster Categories Codeforces Codeforces Round #406 (Div. 2) 1
103 Taymyr is calling you Categories Codeforces Codeforces Round #395 (Div. 2) 1
104 Distance Between Two Points Categories URI 1
105 Die Roll Categories Codeforces Codeforces Beta Round #9 (Div. 2 Only) 1
106 Pasha and Stick Categories Codeforces Codeforces Round #337 (Div. 2) 1
107 Save Luke Categories Codeforces AIM Tech Round (Div. 2) 1
108 Carmichael Numbers Categories UVA 1
109 The number of positions Categories Codeforces Codeforces Beta Round #92 (Div. 2 Only) 1
110 Add Two numbers Categories A2 Online Judge 1
111 HOW MANY GAMES Categories SPOJ 1
112 Difference Categories URI 1
113 Elephant Categories Codeforces Codeforces Round #340 (Div. 2) 1
114 Lucky Numbers Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 1
115 Bachelor Arithmetic Categories Live Archive 2007 Asia - Dhaka 1
116 Drazil and Date Categories Codeforces Codeforces Round #292 (Div. 2) 1
117 Buttons Categories Codeforces Codeforces Round #164 (Div. 2) 1
118 Watermelon Categories Codeforces Codeforces Beta Round #4 (Div. 2 Only) 1
119 Shaass and Oskols Categories Codeforces Codeforces Round #178 (Div. 2) 1
120 Cut Ribbon Categories Codeforces Codeforces Round #119 (Div. 2) 1
121 Complicated GCD Categories Codeforces Codeforces Round #347 (Div. 2) 1
122 Divisibility by Eight Categories Codeforces Codeforces Round #306 (Div. 2) 1
123 Random Teams Categories Codeforces Codeforces Round #273 (Div. 2) 1
124 Factorial Frequencies Categories UVA 1
125 Fedya and Maths Categories Codeforces Codeforces Round #260 (Div. 2) 1
126 Bachgold Problem Categories Codeforces Codeforces Round #388 (Div. 2) 1
127 Time Conversion Categories URI 1
128 Add them twice Categories A2 Online Judge 1
129 Faulty Odometer Categories TJU 2
130 Anton and Fairy Tale Categories Codeforces Codeforces Round #404 (Div. 2) 2
131 Simple Molecules Categories Codeforces Codeforces Round #200 (Div. 2) 2
132 Factory Categories Codeforces Codeforces Round #276 (Div. 2) 2
133 Alice and Bob Categories Codeforces Codeforces Round #201 (Div. 1) & Codeforces Round #201 (Div. 2) 2
134 Hexagons! Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 2
135 Kyoya and Colored Balls Categories Codeforces Codeforces Round #309 (Div. 1) & Codeforces Round #309 (Div. 2) 2
136 Little Artem and Presents Categories Codeforces Codeforces Round #348 (VK Cup 2016 Round 2, Div. 2 Edition) 2
137 The World is a Theatre Categories Codeforces Codeforces Beta Round #95 (Div. 2) 2
138 Permutations Categories UVA 2
139 Yaroslav and Permutations Categories Codeforces Codeforces Round #179 (Div. 2) 2
140 The Wall Categories Codeforces Codeforces Round #198 (Div. 2) 2
141 PRIMITIVEROOTS Categories SPOJ 2
142 Little Elephant and Function Categories Codeforces Codeforces Round #136 (Div. 2) 2
143 Two Bags of Potatoes Categories Codeforces Codeforces Round #148 (Div. 2) 2
144 Increase and Decrease Categories Codeforces Codeforces Round #151 (Div. 2) 2
145 Coconuts, Revisited Categories UVA 2
146 GCD Table Categories Codeforces Codeforces Round #323 (Div. 1) & Codeforces Round #323 (Div. 2) 2
147 Plus and Square Root Categories Codeforces Codeforces Round #372 (Div. 1) & Codeforces Round #372 (Div. 2) 2
148 Ciel and Flowers Categories Codeforces Codeforces Round #190 (Div. 2) 2
149 Adding Digits Categories Codeforces Codeforces Round #158 (Div. 2) 2
150 Drazil and His Happy Friends Categories Codeforces Codeforces Round #292 (Div. 1) & Codeforces Round #292 (Div. 2) & Codeforces Round #292 (Div. 1) & Codeforces Round #292 (Div. 2) 2
151 Mishka and trip Categories Codeforces Codeforces Round #365 (Div. 2) 2
152 Tourist's Notes Categories Codeforces Codeforces Round #300 2
153 Matrix Multiplication Categories PKU 2
154 Pride Categories Codeforces Codeforces Round #446 (Div. 1) & Codeforces Round #446 (Div. 2) 2
155 Hexadecimal's Numbers Categories Codeforces Codeforces Beta Round #9 (Div. 2 Only) 2
156 Mafia Categories Codeforces Codeforces Round #202 (Div. 1) & Codeforces Round #202 (Div. 2) 2
157 Searching the Graph Categories SPOJ Poland 2
158 Arpa’s obvious problem and Mehrdad’s terrible solution Categories Codeforces Codeforces Round #383 (Div. 2) 2
159 Painting Eggs Categories Codeforces Codeforces Round #173 (Div. 2) 2
160 Archer Categories Codeforces Codeforces Round #185 (Div. 2) 2
161 Infinite Sequence Categories Codeforces Educational Codeforces Round 7 2
162 Divisibility Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 2
163 Position in Fraction Categories Codeforces Codeforces Round #450 (Div. 2) 2
164 Marbles Categories UVA 2
165 24 Game Categories Codeforces Codeforces Round #268 (Div. 1) & Codeforces Round #268 (Div. 2) 2
166 Saitama Destroys Hotel Categories Codeforces Codeforces Round #336 (Div. 2) 2
167 Taxes Categories Codeforces Codeforces Round #382 (Div. 2) & Codeforces Round #382 (Div. 1) 2
168 EVEN COUNT Categories SPOJ 2
169 Ebony and Ivory Categories Codeforces Manthan, Codefest 16 2
170 Help Vasilisa the Wise 2 Categories Codeforces Codeforces Round #102 (Div. 2) 2
171 Pythagorean Triples Categories Codeforces Codeforces Round #368 (Div. 2) 2
172 Covered Path Categories Codeforces Codeforces Round #298 (Div. 2) 2
173 Little Dima and Equation Categories Codeforces Codeforces Round #262 (Div. 2) 2
174 New Year Permutation Categories Codeforces Good Bye 2014 2
175 Fixed Points Categories Codeforces Codeforces Round #201 (Div. 2) 2
176 Prime Matrix Categories Codeforces Codeforces Round #166 (Div. 2) 2
177 Leha and Function Categories Codeforces Codeforces Round #429 (Div. 1) & Codeforces Round #429 (Div. 2) 2
178 Hacking Cypher Categories Codeforces Codeforces Round #279 (Div. 2) 2
179 Simple Addition Categories UVA 2
180 Vanya and Food Processor Categories Codeforces Codeforces Round #355 (Div. 2) 2
181 Frugal Search Categories Live Archive 2006 North America - Mid-Central USA 2
182 Restoring Painting Categories Codeforces Codeforces Round #353 (Div. 2) 2
183 Rational Resistance Categories Codeforces Codeforces Round #200 (Div. 1) & Codeforces Round #200 (Div. 2) 2
184 Tennis Championship Categories Codeforces Codeforces Round #382 (Div. 2) & Codeforces Round #382 (Div. 1) 2
185 Vasily the Bear and Triangle Categories Codeforces Codeforces Round #195 (Div. 2) 2
186 Soldier and Number Game Categories Codeforces Codeforces Round #304 (Div. 2) 2
187 Another Problem on Strings Categories Codeforces Codeforces Round #112 (Div. 2) 2
188 Lever Categories Codeforces Codeforces Round #221 (Div. 2) 2
189 Queries on a String Categories Codeforces Educational Codeforces Round 1 2
190 Pouring Rain Categories Codeforces Codeforces Round #349 (Div. 2) 2
191 Opposites Attract Categories Codeforces Codeforces Beta Round #95 (Div. 2) 2
192 Vladik and fractions Categories Codeforces Codeforces Round #384 (Div. 2) 2
193 Straight <<A>> Categories Codeforces Codeforces Round #415 (Div. 2) 2
194 GRADE POINT AVERAGE Categories SPOJ 2
195 New Year Book Reading Categories Codeforces Good Bye 2014 2
196 Little Elephant and Magic Square Categories Codeforces Codeforces Round #157 (Div. 2) 2
197 Bear and Strings Categories Codeforces Codeforces Round #226 (Div. 2) 2
198 Triangular numbers Categories Codeforces Codeforces Beta Round #44 (Div. 2) 2
199 Okabe and Banana Trees Categories Codeforces Codeforces Round #420 (Div. 2) 2
200 Vasya and Robot Categories Codeforces Codeforces Round #206 (Div. 1) & Codeforces Round #206 (Div. 2) 3
201 Fox Dividing Cheese Categories Codeforces Codeforces Round #218 (Div. 2) 3
202 Nuts Categories Codeforces Codeforces Round #236 (Div. 2) 3
203 Plant Categories Codeforces Codeforces Round #118 (Div. 1) & Codeforces Round #118 (Div. 2) 3
204 Arpa's loud Owf and Mehrdad's evil plan Categories Codeforces Codeforces Round #383 (Div. 1) & Codeforces Round #383 (Div. 2) 3
205 Noldbach problem Categories Codeforces Codeforces Beta Round #17 3
206 Median Categories Codeforces Codeforces Round #113 (Div. 2) 3
207 Arpa and an exam about geometry Categories Codeforces Codeforces Round #432 (Div. 2, based on IndiaHacks Final Round 2017) 3
208 Levko and Permutation Categories Codeforces Codeforces Round #210 (Div. 2) 3
209 Testing Pants for Sadness Categories Codeforces Codeforces Beta Round #80 (Div. 1 Only) & Codeforces Beta Round #80 (Div. 2 Only) 3
210 Vasya and the Bus Categories Codeforces Codeforces Round #120 (Div. 2) 3
211 Triangle Categories Codeforces Codeforces Round #239 (Div. 1) & Codeforces Round #239 (Div. 2) 3
212 Valera and Contest Categories Codeforces Codeforces Round #216 (Div. 2) 3
213 Bear and Prime Numbers Categories Codeforces Codeforces Round #226 (Div. 2) 3
214 New Year Table Categories Codeforces Codeforces Round #100 3
215 Polynomial-time Reductions Categories Live Archive 2008 Asia - Hefei 3
216 Memory and De-Evolution Categories Codeforces Codeforces Round #370 (Div. 2) 3
217 Let's Watch Football Categories Codeforces Codeforces Round #123 (Div. 2) 3
218 SPIRAL RUN Categories SPOJ 3
219 Simple Arithmetics Categories Live Archive 2000 Europe - Central 3
220 Azooz Categories SPOJ 3
221 Non-square Equation Categories Codeforces Codeforces Round #144 (Div. 2) 3
222 Catch Me If You Can Categories SPOJ 3
223 Guess Your Way Out! Categories Codeforces Codeforces Round #287 (Div. 2) 3
224 Easy Sum-2 Categories A2 Online Judge 3
225 FUN WITH LETTERS Categories SPOJ 3
226 Year of University Entrance Categories Codeforces VK Cup 2017 - Qualification 1 3
227 K-Periodic Array Categories Codeforces Codeforces Round #218 (Div. 2) 3
228 Numbers Categories Codeforces Codeforces Beta Round #13 3
229 Cows and Primitive Roots Categories Codeforces Codeforces Round #174 (Div. 2) 3
230 Pythagorean Theorem II Categories Codeforces Codeforces Round #183 (Div. 2) 3
231 Robbers' watch Categories Codeforces Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2) 3
232 Permutation Categories Codeforces Codeforces Round #209 (Div. 2) 3
233 Routine Problem Categories Codeforces Codeforces Round #196 (Div. 2) 3
234 Do you want a date? Categories Codeforces Codeforces Round #415 (Div. 1) & Codeforces Round #415 (Div. 2) 3
235 Music Categories Codeforces Codeforces Round #315 (Div. 2) 3
236 Common Divisors Categories Codeforces Codeforces Round #117 (Div. 2) 3
237 Dreamoon and Sums Categories Codeforces Codeforces Round #272 (Div. 2) & Codeforces Round #272 (Div. 1) 3
238 Lucky Permutation Triple Categories Codeforces Codeforces Round #183 (Div. 1) & Codeforces Round #183 (Div. 2) 3
239 Tiling with Hexagons Categories Codeforces Codeforces Round #133 (Div. 2) 3
240 Geometry Problem Categories Live Archive 2009 Asia - Amritapuri 3
241 Masha and geometric depression Categories Codeforces Codeforces Round #407 (Div. 2) 3
242 DNA Alignment Categories Codeforces Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) 3
243 Maximum Value Categories Codeforces Codeforces Round #276 (Div. 1) & Codeforces Round #276 (Div. 2) 3
244 Sereja and Contests Categories Codeforces Codeforces Round #235 (Div. 2) 3
245 Rook, Bishop and King Categories Codeforces Codeforces Round #217 (Div. 2) 3
246 Burger Categories UVA 3
247 Moore's Law Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 3
248 Vanya and Scales Categories Codeforces Codeforces Round #308 (Div. 2) 3
249 Jzzhu and Chocolate Categories Codeforces Codeforces Round #257 (Div. 1) & Codeforces Round #257 (Div. 2) 3
250 The least round way Categories Codeforces Codeforces Beta Round #2 3
251 XOR and OR Categories Codeforces Codeforces Round #173 (Div. 2) 3
252 Unusual Product Categories Codeforces Codeforces Round #238 (Div. 2) & Codeforces Round #238 (Div. 1) 3
253 LUCKYNINE Categories SPOJ 3
254 Quiz Categories Codeforces Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1) 3
255 N - DIGIT NUMBERS Categories SPOJ 3
256 Pashmak and Buses Categories Codeforces Codeforces Round #261 (Div. 2) 3
257 Ternary Logic Categories Codeforces Codeforces Beta Round #97 (Div. 2) 3
258 Little Girl and Maximum XOR Categories Codeforces Codeforces Round #169 (Div. 2) 3
259 Powerful array Categories Codeforces Yandex.Algorithm 2011 Round 2 3
260 A Problem about Polyline Categories Codeforces Codeforces Round #320 (Div. 1) [Bayan Thanks-Round] & Codeforces Round #320 (Div. 2) [Bayan Thanks-Round] 3
261 Andrey and Problem Categories Codeforces Codeforces Round #253 (Div. 1) & Codeforces Round #253 (Div. 2) 3
262 Bicycle Race Categories Codeforces Codeforces Round #346 (Div. 2) 3
263 Primes or Palindromes? Categories Codeforces Codeforces Round #315 (Div. 1) & Codeforces Round #315 (Div. 2) 3
264 Exams Categories Codeforces Codeforces Round #122 (Div. 2) 3
265 Mashmokh and Tokens Categories Codeforces Codeforces Round #240 (Div. 2) 3
266 A Trivial Problem Categories Codeforces Manthan, Codefest 16 3
267 Polycarpus' Dice Categories Codeforces Codeforces Round #298 (Div. 2) 3
268 Modular Equations Categories Codeforces Codeforces Round #282 (Div. 2) 3
269 ZEROES IN RANGE V2 Categories SPOJ 3
270 The Meaningless Game Categories Codeforces Codeforces Round #426 (Div. 1) & Codeforces Round #426 (Div. 2) 3
271 Increasing Sequence Categories Codeforces Codeforces Beta Round #11 3
272 Replace To Make Regular Bracket Sequence Categories Codeforces Educational Codeforces Round 4 3
273 Guest From the Past Categories Codeforces Codeforces Round #342 (Div. 2) 3
274 Flying Saucer Segments Categories Codeforces Codeforces Round #140 (Div. 1) & Codeforces Round #140 (Div. 2) 4
275 Three Logos Categories Codeforces Codeforces Round #322 (Div. 2) 4
276 Petya and Square Categories Codeforces Codeforces Beta Round #85 (Div. 2 Only) 4
277 Fox And Jumping Categories Codeforces Codeforces Round #290 (Div. 2) & Codeforces Round #290 (Div. 1) 4
278 DZY Loves Physics Categories Codeforces Codeforces Round #254 (Div. 1) & Codeforces Round #254 (Div. 2) 4
279 Round Table Knights Categories Codeforces Codeforces Beta Round #65 (Div. 2) 4
280 Square Categories Codeforces Codeforces Round #122 (Div. 2) 4
281 Tavas and Karafs Categories Codeforces Codeforces Round #299 (Div. 2) & Codeforces Round #299 (Div. 1) 4
282 Escape Categories Codeforces Codeforces Round #105 (Div. 2) 4
283 Divisible by Seven Categories Codeforces Codeforces Round #221 (Div. 1) & Codeforces Round #221 (Div. 2) 4
284 Counting Rhombi Categories Codeforces Codeforces Round #119 (Div. 2) 4
285 Limit Categories Codeforces Codeforces Round #124 (Div. 2) 4
286 Elevator Categories Codeforces School Regional Team Contest, Saratov, 2011 4
287 Ralph And His Magic Field Categories Codeforces Codeforces Round #447 (Div. 2) 4
288 Forecast Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 4
289 As Fast As Possible Categories Codeforces Codeforces Round #364 (Div. 1) & Codeforces Round #364 (Div. 2) 4
290 Inna and Huge Candy Matrix Categories Codeforces Codeforces Round #234 (Div. 2) 4
291 MUH and House of Cards Categories Codeforces Codeforces Round #269 (Div. 2) 4
292 Multipliers Categories Codeforces Codeforces Round #338 (Div. 2) 4
293 Ancient Berland Circus Categories Codeforces Codeforces Beta Round #1 4
294 Colliders Categories Codeforces Codeforces Round #109 (Div. 1) & Codeforces Round #109 (Div. 2) 4
295 Pasha and Phone Categories Codeforces Codeforces Round #330 (Div. 2) 4
296 Magical Boxes Categories Codeforces Codeforces Round #165 (Div. 1) & Codeforces Round #165 (Div. 2) 4
297 Depression Categories Codeforces Codeforces Beta Round #69 (Div. 2 Only) 4
298 Trains Categories Codeforces Codeforces Beta Round #73 (Div. 1 Only) & Codeforces Beta Round #73 (Div. 2 Only) 4
299 Bag of mice Categories Codeforces Codeforces Round #105 (Div. 2) 4
300 Predict Outcome of the Game Categories Codeforces Codeforces Round #258 (Div. 2) 4
301 Wonder Room Categories Codeforces Codeforces Round #266 (Div. 2) 4
302 Two Semiknights Meet Categories Codeforces Codeforces Round #212 (Div. 2) 4
303 Olympic Medal Categories Codeforces Codeforces Round #132 (Div. 2) 4
304 Remainders Game Categories Codeforces Codeforces Round #360 (Div. 1) & Codeforces Round #360 (Div. 2) 4
305 Om Nom and Spiders Categories Codeforces Zepto Code Rush 2014 4
306 Tourist Problem Categories Codeforces Codeforces Round #198 (Div. 2) & Codeforces Round #198 (Div. 1) 4
307 Dima and Sequence Categories Codeforces Codeforces Round #167 (Div. 2) 4
308 Lucky Permutation Categories Codeforces Codeforces Round #176 (Div. 1) & Codeforces Round #176 (Div. 2) 4
309 About Bacteria Categories Codeforces Codeforces Round #125 (Div. 1) & Codeforces Round #125 (Div. 2) 4
310 Winnie-the-Pooh and honey Categories Codeforces School Regional Team Contest, Saratov, 2011 4
311 The Intriguing Obsession Categories Codeforces Codeforces Round #439 (Div. 2) 4
312 Gerald and Giant Chess Categories Codeforces Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) 4
313 Friends and Presents Categories Codeforces Codeforces Round #275 (Div. 2) 4
314 Chilly Willy Categories Codeforces Codeforces Round #152 (Div. 2) 4
315 Hopscotch Categories Codeforces Codeforces Round #101 (Div. 2) 4
316 XOR Equation Categories Codeforces 8VC Venture Cup 2016 - Final Round 4
317 Divisibility Categories Codeforces Testing Round #12 4
318 Permutations Categories Codeforces Rockethon 2015 4
319 Marathon Categories Codeforces Codeforces Round #237 (Div. 2) 4
320 Ilya And The Tree Categories Codeforces Codeforces Round #430 (Div. 2) 4
321 Magic Formulas Categories Codeforces Codeforces Round #242 (Div. 2) 4
322 After Training Categories Codeforces Codeforces Round #123 (Div. 2) 4
323 Cableway Categories Codeforces Codeforces Beta Round #74 (Div. 2 Only) 4
324 Division into Teams Categories Codeforces Codeforces Round #106 (Div. 2) 4
325 Count Good Substrings Categories Codeforces Codeforces Round #258 (Div. 2) 4
326 Cookies Categories Codeforces Codeforces Beta Round #64 4
327 Subtractions Categories Codeforces Codeforces Testing Round #5 4
328 Alternating Sum Categories Codeforces Tinkoff Internship Warmup Round 2018 and Codeforces Round #475 (Div. 1) & Tinkoff Internship Warmup Round 2018 and Codeforces Round #475 (Div. 2) 4
329 Vanya and Computer Game Categories Codeforces Codeforces Round #280 (Div. 2) 4
330 Find Pair Categories Codeforces Codeforces Round #111 (Div. 2) 4
331 Marco and GCD Sequence Categories Codeforces Codeforces Round #447 (Div. 2) 4
332 Rebus Categories Codeforces Codeforces Round #347 (Div. 1) & Codeforces Round #347 (Div. 2) 4
333 Indivisibility Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 4
334 Dreamoon and Sets Categories Codeforces Codeforces Round #272 (Div. 2) & Codeforces Round #272 (Div. 1) 4
335 Cylinder Categories UVA 4
336 Quantity of Strings Categories Codeforces Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) 4
337 Find Maximum Categories Codeforces Codeforces Round #205 (Div. 2) 4
338 Weird Fence Categories UVA 4
339 Pipeline Categories Codeforces Codeforces Round #176 (Div. 2) 4
340 The Big Race Categories Codeforces Codeforces Round #328 (Div. 2) 4
341 Mike and Chocolate Thieves Categories Codeforces Codeforces Round #361 (Div. 2) 4
342 Progress Bar Categories Codeforces Codeforces Beta Round #65 (Div. 2) 4
343 View Angle Categories Codeforces Codeforces Round #159 (Div. 2) 4
344 Ciel and Robot Categories Codeforces Codeforces Round #190 (Div. 1) & Codeforces Round #190 (Div. 2) 4
345 Vanya and Triangles Categories Codeforces Codeforces Round #308 (Div. 2) 4
346 Spongebob and Squares Categories Codeforces Codeforces Round #332 (Div. 2) 4
347 A Student's Dream Categories Codeforces Codeforces Beta Round #58 4
348 Pair of Numbers Categories Codeforces Codeforces Round #209 (Div. 2) 4
349 Toy Sum Categories Codeforces Codeforces Round #238 (Div. 2) & Codeforces Round #238 (Div. 1) 4
350 Directed Roads Categories Codeforces Codeforces Round #369 (Div. 2) 4
351 Mischievous Mess Makers Categories Codeforces CROC 2016 - Elimination Round 4
352 Jeff and Rounding Categories Codeforces Codeforces Round #204 (Div. 1) & Codeforces Round #204 (Div. 2) 4
353 Plate Game Categories Codeforces Codeforces Round #124 (Div. 2) 4
354 Magic Five Categories Codeforces Codeforces Round #191 (Div. 2) 4
355 Hometask Categories Codeforces Codeforces Round #131 (Div. 2) 4
356 Magical Array Categories Codeforces Codeforces Beta Round #72 (Div. 1 Only) & Codeforces Beta Round #72 (Div. 2 Only) 4
357 Binary Number Categories Codeforces Codeforces Beta Round #75 (Div. 2 Only) 4
358 Face the mate Categories SPOJ 4
359 Fancy Number Categories Codeforces Codeforces Beta Round #89 (Div. 2) 5
360 Polo the Penguin and XOR operation Categories Codeforces Codeforces Round #177 (Div. 1) & Codeforces Round #177 (Div. 2) 5
361 Clear Symmetry Categories Codeforces Codeforces Round #127 (Div. 1) & Codeforces Round #127 (Div. 2) 5
362 Measuring Lengths in Baden Categories Codeforces Codeforces Testing Round #2 5
363 Om Nom and Candies Categories Codeforces ZeptoLab Code Rush 2015 5
364 Symmetric and Transitive Categories Codeforces Codeforces Round #315 (Div. 1) & Codeforces Round #315 (Div. 2) 5
365 N-ARY TREE Categories SPOJ 5
366 Elimination Categories Codeforces RCC 2014 Warmup (Div. 2) 5
367 Fibonacci-ish Categories Codeforces Manthan, Codefest 16 5
368 Chess Categories Codeforces School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round #38 (ACM-ICPC Rules) 5
369 Soldier and Traveling Categories Codeforces Codeforces Round #304 (Div. 2) 5
370 Making Sequences is Fun Categories Codeforces Codeforces Round #219 (Div. 2) 5
371 Moodular Arithmetic Categories Codeforces Codeforces Round #334 (Div. 1) & Codeforces Round #334 (Div. 2) 5
372 Ryouko's Memory Note Categories Codeforces Codeforces Round #248 (Div. 2) & Codeforces Round #248 (Div. 1) 5
373 Chip 'n Dale Rescue Rangers Categories Codeforces Codeforces Round #327 (Div. 1) & Codeforces Round #327 (Div. 2) 5
374 Falling Anvils Categories Codeforces Codeforces Beta Round #69 (Div. 1 Only) & Codeforces Beta Round #69 (Div. 2 Only) 5
375 Jumping Jack Categories Codeforces Codeforces Beta Round #11 5
376 Array Game Categories Live Archive 2009 Asia - Tehran 5
377 Xenia and Hamming Categories Codeforces Codeforces Round #207 (Div. 1) & Codeforces Round #207 (Div. 2) 5
378 Upgrading Array Categories Codeforces Codeforces Round #236 (Div. 2) & Codeforces Round #236 (Div. 1) 5
379 Square Subsets Categories Codeforces Codeforces Round #448 (Div. 2) 5
380 Sum Categories Codeforces Codeforces Beta Round #46 (Div. 2) 5
381 Cubical Planet Categories Codeforces School Team Contest #1 (Winter Computer School 2010/11) 5
382 Mike and Frog Categories Codeforces Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) 5
383 Kyoya and Permutation Categories Codeforces Codeforces Round #309 (Div. 1) & Codeforces Round #309 (Div. 2) 5
384 Valid Sets Categories Codeforces Codeforces Round #277 (Div. 2) 5
385 Petya and His Friends Categories Codeforces Codeforces Beta Round #61 (Div. 2) 5
386 Datatypes Categories Codeforces Codeforces Beta Round #83 (Div. 2 Only) 5
387 Flea travel Categories Codeforces Codeforces Beta Round #51 5
388 Accounting Categories Codeforces Codeforces Beta Round #30 (Codeforces format) 5
389 Board Game Categories Codeforces VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) 5
390 Find Color Categories Codeforces Codeforces Beta Round #39 5
391 Equation Categories Codeforces Codeforces Alpha Round #20 (Codeforces format) 5
392 Rectangle and Square Categories Codeforces Codeforces Beta Round #97 (Div. 1) & Codeforces Beta Round #97 (Div. 2) 5
393 Line Categories Codeforces Codeforces Beta Round #7 5
394 Careful teacher Categories UVA 5
395 Iahub and Permutations Categories Codeforces Codeforces Round #198 (Div. 2) & Codeforces Round #198 (Div. 1) 5
396 Two Heaps Categories Codeforces Codeforces Round #205 (Div. 2) 5
397 Dima and Two Sequences Categories Codeforces Codeforces Round #167 (Div. 2) & Codeforces Round #167 (Div. 1) 5
398 Lucky Tree Categories Codeforces Codeforces Beta Round #84 (Div. 1 Only) & Codeforces Beta Round #84 (Div. 2 Only) 5
399 Clique in the Divisibility Graph Categories Codeforces VK Cup 2015 - Finals, online mirror 5
400 Friends Categories Codeforces Codeforces Beta Round #76 (Div. 2 Only) 5
401 Anton and School - 2 Categories Codeforces Codeforces Round #404 (Div. 2) 5
402 Four Segments Categories Codeforces Codeforces Beta Round #14 (Div. 2) 5
403 Fox and Minimal path Categories Codeforces Codeforces Round #228 (Div. 1) & Codeforces Round #228 (Div. 2) 5
404 Continued Fractions Categories Codeforces Codeforces Round #184 (Div. 2) 5
405 Malek Dance Club Categories Codeforces Codeforces Round #189 (Div. 1) & Codeforces Round #189 (Div. 2) 5
406 Help Farmer Categories Codeforces Codeforces Round #102 (Div. 1) & Codeforces Round #102 (Div. 2) 5
407 Colorful Field Categories Codeforces Codeforces Beta Round #71 5
408 Hunting Digletts Categories URI 5
409 Prime Number Categories Codeforces Codeforces Round #209 (Div. 2) 5
410 Elevator Categories Codeforces Codeforces Beta Round #88 5
411 Degenerate Matrix Categories Codeforces Looksery Cup 2015 5
412 Special Task Categories Codeforces ABBYY Cup 3.0 5
413 Not Wool Sequences Categories Codeforces Codeforces Round #148 (Div. 1) & Codeforces Round #148 (Div. 2) 5
414 Misha and Permutations Summation Categories Codeforces Codeforces Round #285 (Div. 2) & Codeforces Round #285 (Div. 1) 5
415 Pretty Song Categories Codeforces Codeforces Round #289 (Div. 2, ACM ICPC Rules) 5
416 Winter is here Categories Codeforces Codeforces Round #428 (Div. 2) 5
417 CGCDSSQ Categories Codeforces Bayan 2015 Contest Warm Up 5
418 Lengthening Sticks Categories Codeforces Codeforces Round #317 [AimFund Thanks-Round] (Div. 1) & Codeforces Round #317 [AimFund Thanks-Round] (Div. 2) 5
419 Rock-Paper-Scissors Categories Codeforces Croc Champ 2012 - Round 1 5
420 Vitaly and Cycle Categories Codeforces Codeforces Round #311 (Div. 2) 5
421 Chocolate Categories Codeforces Codeforces Round #279 (Div. 2) 5
422 Expensive Drink Categories Live Archive 2007 Asia - Beijing 5
423 Game on Tree Categories Codeforces Codeforces Round #172 (Div. 1) & Codeforces Round #172 (Div. 2) 6
424 Unusual Sequences Categories Codeforces Codeforces Round #450 (Div. 2) 6
425 Vasily the Bear and Fly Categories Codeforces Codeforces Round #195 (Div. 2) 6
426 GAMING ARENA Categories SPOJ 6
427 Design Space Categories URI 6
428 Mr. Bender and Square Categories Codeforces Codeforces Round #156 (Div. 2) & Codeforces Round #156 (Div. 1) 6
429 Harry Potter and Three Spells Categories Codeforces Codeforces Beta Round #60 6
430 ZEROES IN RANGE Categories SPOJ 6
431 GukiZ and Binary Operations Categories Codeforces Codeforces Round #307 (Div. 2) 6
432 Problem About Equation Categories Codeforces VK Cup 2012 Round 3 (Unofficial Div. 2 Edition) 6
433 Golden System Categories Codeforces MemSQL Start[c]UP 2.0 - Round 2 6
434 Guess That Car! Categories Codeforces Codeforces Round #127 (Div. 1) & Codeforces Round #127 (Div. 2) 6
435 Hot Bath Categories Codeforces Codeforces Beta Round #93 (Div. 1 Only) & Codeforces Beta Round #93 (Div. 2 Only) 6
436 Bear and Polynomials Categories Codeforces VK Cup 2016 - Round 1 6
437 Number Transformation II Categories Codeforces Codeforces Round #201 (Div. 1) & Codeforces Round #201 (Div. 2) 6
438 Mushroom Scientists Categories Codeforces Codeforces Round #118 (Div. 1) & Codeforces Round #118 (Div. 2) 6
439 A rectangle Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 6
440 Platforms Categories Codeforces Codeforces Beta Round #18 (Div. 2 Only) 6
441 Partial Sums Categories Codeforces Codeforces Round #138 (Div. 1) & Codeforces Round #138 (Div. 2) 6
442 Parallel Expectations Categories Live Archive 2001 Asia - Tehran 6
443 ZS and The Birthday Paradox Categories Codeforces Codeforces Round #369 (Div. 2) 6
444 Longest Subsequence Categories Codeforces Educational Codeforces Round 9 6
445 3-cycles Categories Codeforces Codeforces Beta Round #40 (Div. 2) 6
446 Hit Ball Categories Codeforces Codeforces Round #128 (Div. 2) 6
447 Triangles Categories Codeforces Codeforces Round #142 (Div. 1) & Codeforces Round #142 (Div. 2) 6
448 ANYTHING FOR ATTENDANCE Categories SPOJ 6
449 International Olympiad Categories Codeforces CROC 2016 - Final Round [Private, For Onsite Finalists Only] 6
450 Stadium and Games Categories Codeforces MemSQL start[c]up Round 1 6
451 Maxim and Restaurant Categories Codeforces Codeforces Round #160 (Div. 1) & Codeforces Round #160 (Div. 2) 6
452 Average Score Categories Codeforces Yandex.Algorithm Open 2011 Qualification 1 6
453 Little Elephant and LCM Categories Codeforces Codeforces Round #157 (Div. 1) & Codeforces Round #157 (Div. 2) 6
454 LIS of Sequence Categories Codeforces Codeforces Round #277 (Div. 2) 6
455 Demiurges Play Again Categories Codeforces Codeforces Round #300 6
456 Insertion Sort Categories Codeforces Codeforces Round #212 (Div. 2) 6
457 Let's Play Osu! Categories Codeforces Codeforces Round #146 (Div. 1) & Codeforces Round #146 (Div. 2) 6
458 Prizes Categories A2 Online Judge 6
459 Array Categories Codeforces Codeforces Beta Round #53 6
460 Mathematical Analysis Rocks! Categories Codeforces Codeforces Round #116 (Div. 2, ACM-ICPC Rules) 6
461 Flea Categories Codeforces Codeforces Beta Round #32 (Div. 2, Codeforces format) 6
462 CUBE ROOT Categories SPOJ 6
463 Jeopardy! Categories Codeforces Coder-Strike 2014 - Round 2 6
464 Playing with Permutations Categories Codeforces Codeforces Round #153 (Div. 1) & Codeforces Round #153 (Div. 2) 6
465 Party Categories Codeforces Codeforces Beta Round #23 6
466 Functions Categories A2 Online Judge 6
467 Police Patrol Categories Codeforces Codeforces Round #244 (Div. 2) 6
468 Karen and Test Categories Codeforces Codeforces Round #419 (Div. 1) & Codeforces Round #419 (Div. 2) 6
469 A Heap of Heaps Categories Codeforces Codeforces Round #300 6
470 Magic Trick Categories Codeforces MemSQL Start[c]UP 2.0 - Round 1 6
471 Collision Detection Categories Live Archive 2012 North America - Mid-Atlantic USA & North America - Southeast USA 6
472 Number Busters Categories Codeforces Codeforces Round #224 (Div. 2) 6
473 Rectangle Puzzle II Categories Codeforces Codeforces Round #183 (Div. 1) & Codeforces Round #183 (Div. 2) 6
474 Pluses everywhere Categories Codeforces Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) 6
475 Vanya and Field Categories Codeforces Codeforces Round #280 (Div. 2) 6
476 CHOCOLATES Categories SPOJ 6
477 Watching Fireworks is Fun Categories Codeforces Codeforces Round #219 (Div. 1) & Codeforces Round #219 (Div. 2) 6
478 Lucky Subsequence Categories Codeforces Codeforces Round #104 (Div. 1) & Codeforces Round #104 (Div. 2) 6
479 Sum Categories Codeforces Codeforces Round #159 (Div. 2) 6
480 The Elder Trolls IV: Oblivon Categories Codeforces Codeforces Beta Round #66 6
481 Table Categories Codeforces Codeforces Round #144 (Div. 1) & Codeforces Round #144 (Div. 2) 6
482 Random Task Categories Codeforces Codeforces Round #247 (Div. 2) 6
483 Below the Diagonal Categories Codeforces Codeforces Round #163 (Div. 2) 6
484 Fibonacci 2.0 Categories A2 Online Judge 6
485 Points Categories Codeforces All-Ukrainian School Olympiad in Informatics 6
486 Doctor Categories Codeforces Codeforces Beta Round #72 (Div. 1 Only) & Codeforces Beta Round #72 (Div. 2 Only) 6
487 Wallpaper Categories Codeforces Codeforces Beta Round #99 (Div. 2) 6
488 Playlist Categories Codeforces Codeforces Round #164 (Div. 2) 7
489 On Corruption and Numbers Categories Codeforces Codeforces Round #232 (Div. 2) 7
490 Follow Traffic Rules Categories Codeforces Codeforces Beta Round #5 7
491 First Digit Law Categories Codeforces Codeforces Beta Round #50 7
492 Powers Categories Live Archive 2004 Africa/Middle East - South Africa 7
493 Sequence of points Categories Codeforces Codeforces Beta Round #24 7
494 Simple Skewness Categories Codeforces 8VC Venture Cup 2016 - Elimination Round 7
495 Idempotent functions Categories Codeforces VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) 7
496 Square Table Categories Codeforces RCC 2014 Warmup (Div. 2) & RCC 2014 Warmup (Div. 1) 7
497 Vasily the Bear and Beautiful Strings Categories Codeforces Codeforces Round #195 (Div. 2) 7
498 Binary Table Categories Codeforces CROC 2016 - Final Round [Private, For Onsite Finalists Only] 7
499 Blocked Points Categories Codeforces Codeforces Round #230 (Div. 1) & Codeforces Round #230 (Div. 2) 7
500 Rat Kwesh and Cheese Categories Codeforces Codeforces Round #341 (Div. 2) 7
501 Furlo and Rublo and Game Categories Codeforces Codeforces Round #156 (Div. 2) & Codeforces Round #156 (Div. 1) 7
502 Pairs of Numbers Categories Codeforces Codeforces Testing Round #3 7
503 Big Maximum Sum Categories Codeforces Codeforces Beta Round #67 (Div. 2) 7
504 Empire Strikes Back Categories Codeforces Codeforces Round #181 (Div. 2) 7
505 Curious Array Categories Codeforces Codeforces Round #239 (Div. 1) & Codeforces Round #239 (Div. 2) 7
506 Hexagons Categories Codeforces Codeforces Round #338 (Div. 2) 7
507 Disposition Categories Codeforces Codeforces Beta Round #46 (Div. 2) 7
508 Bamboo Partition Categories Codeforces Codeforces Round #424 (Div. 1, rated, based on VK Cup Finals) & Codeforces Round #424 (Div. 2, rated, based on VK Cup Finals) 7
509 The Last Fight Between Human and AI Categories Codeforces Codeforces Round #354 (Div. 2) 7
510 String Mark Categories Codeforces Codeforces Round #448 (Div. 2) 7
511 Restoring Numbers Categories Codeforces Codeforces Round #289 (Div. 2, ACM ICPC Rules) 7
512 Squares Categories Codeforces Codeforces Beta Round #92 (Div. 1 Only) & Codeforces Beta Round #92 (Div. 2 Only) 7
513 Devu and Birthday Celebration Categories Codeforces Codeforces Round #251 (Div. 2) 7
514 Reflection Categories Codeforces Yandex.Algorithm 2011 Round 2 7
515 Subway Innovation Categories Codeforces Codeforces Round #218 (Div. 2) 7
516 Sum of Remainders Categories Codeforces Educational Codeforces Round 5 7
517 Little Elephant and Furik and Rubik Categories Codeforces Codeforces Round #129 (Div. 1) & Codeforces Round #129 (Div. 2) 7
518 Little Artem and Random Variable Categories Codeforces VK Cup 2016 - Round 2 7
519 Analyzing Polyline Categories Codeforces Codeforces Round #123 (Div. 2) 7
520 The Water Taps Categories SPOJ 7
521 Maxim and Matrix Categories Codeforces Codeforces Round #160 (Div. 1) & Codeforces Round #160 (Div. 2) 7
522 Case of a Top Secret Categories Codeforces Codeforces Round #310 (Div. 1) 7
523 Bribes Categories Codeforces Bubble Cup 8 - Finals [Online Mirror] 7
524 Intersection Categories Codeforces Codeforces Alpha Round #21 (Codeforces format) 7
525 Repaintings Categories Codeforces Codeforces Beta Round #39 7
526 Plus and xor Categories Codeforces All-Ukrainian School Olympiad in Informatics 7
527 Hack it! Categories Codeforces Codeforces Round #268 (Div. 1) & Codeforces Round #268 (Div. 2) 7
528 Laser Categories Codeforces Codeforces Beta Round #15 7
529 Turn Categories Codeforces Experimental Educational Round: VolBIT Formulas Blitz 7
530 On Sum of Fractions Categories Codeforces Codeforces Round #232 (Div. 1) & Codeforces Round #232 (Div. 2) 7
531 Minimum Modular Categories Codeforces Codeforces Round #183 (Div. 1) & Codeforces Round #183 (Div. 2) 7
532 Blackboard Fibonacci Categories Codeforces Codeforces Round #134 (Div. 1) & Codeforces Round #134 (Div. 2) 7
533 Vasya and Polynomial Categories Codeforces Codeforces Round #281 (Div. 2) 8
534 The Race Categories Codeforces School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) 8
535 Morning run Categories Codeforces Croc Champ 2013 - Finals (online version, Div. 1) 8
536 Lannion Visit Categories A2 Online Judge 8
537 Cowslip Collections Categories Codeforces CROC 2016 - Elimination Round 8
538 Positions in Permutations Categories Codeforces Codeforces Round #175 (Div. 2) 8
539 Mother of Dragons Categories Codeforces Codeforces Round #428 (Div. 2) 8
540 BerDonalds Categories Codeforces Codeforces Round #163 (Div. 2) 8
541 Numbers Categories Codeforces Codeforces Beta Round #72 (Div. 1 Only) 8
542 Summer Homework Categories Codeforces ABBYY Cup 3.0 8
543 Anniversary Categories Codeforces Codeforces Round #140 (Div. 1) & Codeforces Round #140 (Div. 2) 8
544 Interval Cubing Categories Codeforces Codeforces Round #185 (Div. 1) 8
545 Math Homework Categories A2 Online Judge 8
546 More Queries to Array... Categories Codeforces Codeforces Round #163 (Div. 2) 8
547 Hamming Distance Categories Codeforces Codeforces Round #122 (Div. 1) & Codeforces Round #122 (Div. 2) 8
548 Bear in the Field Categories Codeforces Codeforces Round #226 (Div. 2) 8
549 Cube Problem Categories Codeforces Croc Champ 2013 - Round 2 8
550 Fibonacci Sums Categories Codeforces Codeforces Beta Round #93 (Div. 1 Only) 8
551 Plumber Categories Codeforces Codeforces Beta Round #87 (Div. 1 Only) & Codeforces Beta Round #87 (Div. 2 Only) 8
552 Wizards and Numbers Categories Codeforces Codeforces Round #114 (Div. 1) & Codeforces Round #114 (Div. 2) 8
553 Misha and Palindrome Degree Categories Codeforces Codeforces Round #285 (Div. 2) & Codeforces Round #285 (Div. 1) 8
554 The Sum of the k-th Powers Categories Codeforces Educational Codeforces Round 7 8
555 Ladies' Shop Categories Codeforces Codeforces Round #176 (Div. 1) 8
556 Capture Valerian Categories Codeforces Codeforces Beta Round #57 (Div. 2) 8
557 Memory and Casinos Categories Codeforces Codeforces Round #370 (Div. 2) 8
558 Little Elephant and Broken Sorting Categories Codeforces Codeforces Round #157 (Div. 1) 8
559 Ghd Categories Codeforces Codeforces Round #213 (Div. 1) 8
560 Martian Luck Categories Codeforces Codeforces Round #133 (Div. 2) 8
561 Unsolvable Categories Codeforces Codeforces Round #139 (Div. 2) 8
562 Headquarters Categories Codeforces Croc Champ 2012 - Final 8
563 Strange Sorting Categories Codeforces Codeforces Round #276 (Div. 1) & Codeforces Round #276 (Div. 2) 8
564 Collisions Categories Codeforces Codeforces Beta Round #34 (Div. 2) 8
565 Hyperdrive Categories Codeforces School Team Contest #2 (Winter Computer School 2010/11) 8
566 Olya and Graph Categories Codeforces Codeforces Round #184 (Div. 2) 8
567 Multicolored Marbles Categories Codeforces VK Cup 2012 Finals, Practice Session 8
568 Cows and Cool Sequences Categories Codeforces Codeforces Round #174 (Div. 1) 8
569 GCD Table Categories Codeforces Codeforces Round #196 (Div. 1) 8
570 Three Horses Categories Codeforces Codeforces Round #166 (Div. 2) 8
571 Cow Tennis Tournament Categories Codeforces Codeforces Round #174 (Div. 1) 8
572 Vectors Categories Codeforces Codeforces Beta Round #79 (Div. 1 Only) & Codeforces Beta Round #79 (Div. 2 Only) 8
573 Smart Cheater Categories Codeforces Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) 8
574 Dima and Magic Guitar Categories Codeforces Codeforces Round #214 (Div. 2) 8
575 Beautiful Function Categories Codeforces Codeforces Round #329 (Div. 2) 9
576 Gambling Nim Categories Codeforces CROC 2016 - Final Round [Private, For Onsite Finalists Only] 9
577 Ciel and Flipboard Categories Codeforces Codeforces Round #190 (Div. 1) 9
578 Morrowindows Categories Codeforces Codeforces Beta Round #66 9
579 Pixels Categories Codeforces VK Cup 2012 Finals, Practice Session 9
580 Four Divisors Categories Codeforces Educational Codeforces Round 12 9
581 Flags Categories Codeforces Codeforces Beta Round #76 (Div. 1 Only) 9
582 New York Hotel Categories Codeforces Testing Round #11 9
583 Rotatable Number Categories Codeforces Codeforces Round #183 (Div. 1) 9
584 Bitonix' Patrol Categories Codeforces Codeforces Round #134 (Div. 1) 9
585 Polo the Penguin and Lucky Numbers Categories Codeforces Codeforces Round #177 (Div. 1) 9
586 Optimal Point Categories Codeforces Codeforces Round #359 (Div. 1) & Codeforces Round #359 (Div. 2) 9
587 Savior Categories Codeforces Codeforces Beta Round #56 9
588 Sign Posts Categories Codeforces Codeforces Round #315 (Div. 1) 9
589 Horse Races Categories Codeforces Codeforces Beta Round #77 (Div. 1 Only) & Codeforces Beta Round #77 (Div. 2 Only) 9
590 Lust Categories Codeforces Codeforces Round #446 (Div. 1) 9
591 Red and Black Tree Categories Codeforces Codeforces Round #221 (Div. 1) 9
592 Ruminations on Ruminants Categories Codeforces Codeforces Round #334 (Div. 1) 9
593 Fibonotci Categories Codeforces Bubble Cup 8 - Finals [Online Mirror] 9
594 Divisibility Rules Categories Codeforces Codeforces Round #116 (Div. 2, ACM-ICPC Rules) 9
595 Lostborn Categories Codeforces Codeforces Beta Round #76 (Div. 1 Only) 9
596 Theft of Blueprints Categories Codeforces Codeforces Round #193 (Div. 2) 9
597 Endless Matrix Categories Codeforces Codeforces Round #152 (Div. 1) 9
598 Superhero's Job Categories Codeforces VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) 9
599 Flatland Fencing Categories Codeforces Codeforces Round #109 (Div. 1) 9
600 Surprise me! Categories Codeforces Codeforces Round #415 (Div. 1) 9
601 Archer's Shot Categories Codeforces Codeforces Beta Round #70 (Div. 2) 9
602 Present for Vitalik the Philatelist Categories Codeforces Codeforces Round #325 (Div. 1) 9
603 Mushroom Gnomes Categories Codeforces Codeforces Beta Round #56 9
604 Extraordinarily Nice Numbers Categories Codeforces Unknown Language Round #2 9
605 Rotation Categories Codeforces Unknown Language Round #3 9
606 Bear and Paradox Categories Codeforces VK Cup 2016 - Round 1 9
607 Visit of the Great Categories Codeforces Codeforces Round #118 (Div. 1) 9
608 Yet Another Number Sequence Categories Codeforces Codeforces Round #230 (Div. 1) & Codeforces Round #230 (Div. 2) 9
609 Sereja and Cinema Categories Codeforces Codeforces Round #223 (Div. 1) 9
610 Fibonacci Number Categories Codeforces Codeforces Round #122 (Div. 1) 9
611 Strange town Categories Codeforces Codeforces Beta Round #41 9
612 Donkey and Stars Categories Codeforces Codeforces Round #152 (Div. 1) 9
613 Design Tutorial: Change the Goal Categories Codeforces Codeforces Round #270 9
614 Ksusha and Square Categories Codeforces Croc Champ 2013 - Round 2 9
615 Roland and Rose Categories Codeforces Codeforces Round #262 (Div. 2) 9
616 LCM Categories Codeforces Surprise Language Round #6 9
617 Task processing Categories Codeforces 2015-2016 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) 9
618 Cowboys Categories Codeforces VK Cup 2012 Finals (unofficial online-version) 9
619 Wizards and Bets Categories Codeforces Codeforces Round #114 (Div. 1) 9
620 Physical Education and Buns Categories Codeforces Codeforces Round #231 (Div. 2) 9
621 Tractor College Categories Codeforces Codeforces Round #126 (Div. 2) 9
622 Journey Categories Codeforces Codeforces Beta Round #53 9
623 Winning Strategy Categories Codeforces Yandex.Algorithm 2011 Finals 9
624 Ivan the Fool VS Gorynych the Dragon Categories Codeforces School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) 9
625 Two Sets Categories Codeforces Codeforces Round #153 (Div. 1) 9
626 Fox and Perfect Sets Categories Codeforces Codeforces Round #228 (Div. 1) 9
627 Lesson Timetable Categories Codeforces Codeforces Beta Round #37 9
628 Tetris revisited Categories Codeforces Yandex.Algorithm 2011 Round 2 9
629 Appleman and Complicated Task Categories Codeforces Codeforces Round #263 (Div. 1) 9
630 Not Quick Transformation Categories Codeforces Codeforces Beta Round #88 9
631 Square Equation Roots Categories Codeforces Codeforces Beta Round #47 9
632 Table Categories Codeforces Unknown Language Round #1 9
633 Little Elephant and Triangle Categories Codeforces Codeforces Round #136 (Div. 1) 9
634 Subarray Cuts Categories Codeforces Rockethon 2015 9
635 Strange Radiation Categories Codeforces Codeforces Round #425 (Div. 2) 9
636 Tetragon Categories Codeforces Codeforces Beta Round #23 9
637 Berland Square Categories Codeforces Codeforces Beta Round #39 9
638 PE Lesson Categories Codeforces ABBYY Cup 3.0 9
639 Friends Categories Codeforces Bayan 2012-2013 Elimination Round (ACM ICPC Rules, English statements) 9
640 Summer Homework Categories Codeforces ABBYY Cup 3.0 9
641 Wisdom Categories Live Archive 2004 Africa/Middle East - South Africa 10
642 Chess Categories Codeforces Codeforces Beta Round #53 10
643 Help Shrek and Donkey Categories Codeforces Codeforces Beta Round #78 (Div. 1 Only) 10
644 Sleeping Categories Codeforces Codeforces Beta Round #86 (Div. 1 Only) 10
645 Nephren Runs a Cinema Categories Codeforces Codeforces Round #449 (Div. 1) 10
646 Long sequence Categories Codeforces Yandex.Algorithm 2011 Round 2 10
647 Geometric Progressions Categories Codeforces Codeforces Round #317 [AimFund Thanks-Round] (Div. 1) 10
648 Hamming Triples Categories Codeforces Codeforces Round #238 (Div. 1) 10
649 Interesting Sequence Categories Codeforces Codeforces Beta Round #39 10
650 Evil Categories Codeforces Codeforces Round #192 (Div. 1) 10
651 Days of Floral Colours Categories Codeforces Codeforces Round #431 (Div. 1) 10
652 Sequence Transformation Categories Codeforces Codeforces Round #172 (Div. 1) 10
653 DZY Loves Games Categories Codeforces Codeforces Round #255 (Div. 1) 10
654 Goshtasp, Vishtasp and Eidi Categories Codeforces Unknown Language Round #2 10
655 Bingo! Categories Codeforces MemSQL Start[c]UP 2.0 - Round 2 10
656 Lamps in a Line Categories Codeforces Unknown Language Round #3 10
657 DZY Loves Bridges Categories Codeforces Codeforces Round #255 (Div. 1) 10
658 Flow Optimality Categories Codeforces MemSQL Start[c]UP 2.0 - Round 2 10
659 Gears Categories Codeforces Codeforces Round #283 (Div. 1) 10
660 Doodle Jump Categories Codeforces Codeforces Round #201 (Div. 1) 10
661 Sasha Circle Categories Codeforces Looksery Cup 2015 10
662 Mutation Categories Codeforces All-Ukrainian School Olympiad in Informatics 10
663 Ants on a Circle Categories Codeforces Educational Codeforces Round 10 10
664 Counting Skyscrapers Categories Codeforces MemSQL start[c]up Round 2 - online version 10
665 Perpetual Motion Machine Categories Codeforces Codeforces Round #424 (Div. 1, rated, based on VK Cup Finals) 10
666 Birthday Categories Codeforces Codeforces Beta Round #94 (Div. 1 Only) 10
667 Oil Categories Codeforces Unknown Language Round #2 10
668 Interval Coloring Categories Codeforces Unknown Language Round #3 10
669 Lucky Interval Categories Codeforces Codeforces Beta Round #84 (Div. 1 Only) 10
670 Olympic Games Categories Codeforces Codeforces Round #235 (Div. 2) 10
671 Berland Traffic Categories Codeforces Codeforces Testing Round #5 10
672 BigFibonacci Categories TopCoder TCO06 Sponsor 5 - Div1 hard] (9916) 10
673 DravDe saves the world Categories Codeforces Codeforces Beta Round #28 (Codeforces format) 10
674 Mod Mod Mod Categories Codeforces Codeforces Round #445 (Div. 1, based on Technocup 2018 Elimination Round 3) 10
675 Security System Categories Codeforces Codeforces Beta Round #71 10
676 Jzzhu and Squares Categories Codeforces Codeforces Round #257 (Div. 1) 10
677 Agricultural Archaeology Categories Codeforces 2015-2016 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) 10
678 Permanent Categories Codeforces Codeforces Round #268 (Div. 1) 10
679 Berserk Robot Categories Codeforces Codeforces Round #300 10