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