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