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