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