| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Spreadsheet | Codeforces | Codeforces Beta Round #1 | 1 | |
| 2 | Before an Exam | Codeforces | Codeforces Beta Round #4 (Div. 2 Only) | 1 | |
| 3 | Borze | Codeforces | Codeforces Beta Round #32 (Div. 2, Codeforces format) | 1 | |
| 4 | Sale | Codeforces | Codeforces Beta Round #34 (Div. 2) | 1 | |
| 5 | Present from Lena | Codeforces | Codeforces Beta Round #89 (Div. 2) | 1 | |
| 6 | Drinks | Codeforces | Codeforces Round #126 (Div. 2) | 1 | |
| 7 | T-primes | Codeforces | Codeforces Round #142 (Div. 2) | 1 | |
| 8 | Roadside Trees (Simplified Edition) | Codeforces | Codeforces Round #162 (Div. 2) | 1 | |
| 9 | Queue at the School | Codeforces | Codeforces Round #163 (Div. 2) | 1 | |
| 10 | Buttons | Codeforces | Codeforces Round #164 (Div. 2) | 1 | |
| 11 | Little Girl and Game | Codeforces | Codeforces Round #169 (Div. 2) | 1 | |
| 12 | Books | Codeforces | Codeforces Round #171 (Div. 2) | 1 | |
| 13 | Ilya and Queries | Codeforces | Codeforces Round #186 (Div. 2) | 1 | |
| 14 | Hungry Sequence | Codeforces | Codeforces Round #191 (Div. 2) | 1 | |
| 15 | Road Construction | Codeforces | Codeforces Round #192 (Div. 2) | 1 | |
| 16 | Xenia and Ringroad | Codeforces | Codeforces Round #197 (Div. 2) | 1 | |
| 17 | Fence | Codeforces | Codeforces Round #211 (Div. 2) | 1 | |
| 18 | Sereja and Suffixes | Codeforces | Codeforces Round #215 (Div. 2) | 1 | |
| 19 | Prison Transfer | Codeforces | Codeforces Round #244 (Div. 2) | 1 | |
| 20 | Kuriyama Mirai's Stones | Codeforces | Codeforces Round #248 (Div. 2) | 1 | |
| 21 | Devu, the Dumb Guy | Codeforces | Codeforces Round #251 (Div. 2) | 1 | |
| 22 | DZY Loves Strings | Codeforces | Codeforces Round #255 (Div. 2) | 1 | |
| 23 | Suffix Structures | Codeforces | Codeforces Round #256 (Div. 2) | 1 | |
| 24 | Jzzhu and Sequences | Codeforces | Codeforces Round #257 (Div. 2) | 1 | |
| 25 | Sort the Array | Codeforces | Codeforces Round #258 (Div. 2) | 1 | |
| 26 | Little Pony and Sort by Shift | Codeforces | Codeforces Round #259 (Div. 2) | 1 | |
| 27 | Fedya and Maths | Codeforces | Codeforces Round #260 (Div. 2) | 1 | |
| 28 | Pashmak and Flowers | Codeforces | Codeforces Round #261 (Div. 2) | 1 | |
| 29 | Caisa and Pylons | Codeforces | Codeforces Round #264 (Div. 2) | 1 | |
| 30 | Inbox (100500) | Codeforces | Codeforces Round #265 (Div. 2) | 1 | |
| 31 | Fedor and New Game | Codeforces | Codeforces Round #267 (Div. 2) | 1 | |
| 32 | Worms | Codeforces | Codeforces Round #271 (Div. 2) | 1 | |
| 33 | Dreamoon and WiFi | Codeforces | Codeforces Round #272 (Div. 2) | 1 | |
| 34 | Random Teams | Codeforces | Codeforces Round #273 (Div. 2) | 1 | |
| 35 | OR in Matrix | Codeforces | Codeforces Round #277 (Div. 2) | 1 | |
| 36 | BerSU Ball | Codeforces | Codeforces Round #277.5 (Div. 2) | 1 | |
| 37 | Vanya and Lanterns | Codeforces | Codeforces Round #280 (Div. 2) | 1 | |
| 38 | Lecture | Codeforces | Codeforces Round #284 (Div. 2) | 1 | |
| 39 | Misha and Changing Handles | Codeforces | Codeforces Round #285 (Div. 2) | 1 | |
| 40 | Amr and Pins | Codeforces | Codeforces Round #287 (Div. 2) | 1 | |
| 41 | Anton and currency you all know | Codeforces | Codeforces Round #288 (Div. 2) | 1 | |
| 42 | Han Solo and Lazer Gun | Codeforces | Codeforces Round #291 (Div. 2) | 1 | |
| 43 | A and B and Compilation Errors | Codeforces | Codeforces Round #294 (Div. 2) | 1 | |
| 44 | Two Buttons | Codeforces | Codeforces Round #295 (Div. 2) | 1 | |
| 45 | Tavas and SaDDas | Codeforces | Codeforces Round #299 (Div. 2) | 1 | |
| 46 | Quasi Binary | Codeforces | Codeforces Round #300 | 1 | |
| 47 | Equidistant String | Codeforces | Codeforces Round #303 (Div. 2) | 1 | |
| 48 | Soldier and Badges | Codeforces | Codeforces Round #304 (Div. 2) | 1 | |
| 49 | Preparing Olympiad | Codeforces | Codeforces Round #306 (Div. 2) | 1 | |
| 50 | Vanya and Books | Codeforces | Codeforces Round #308 (Div. 2) | 1 | |
| 51 | Berland National Library | Codeforces | Codeforces Round #Pi (Div. 2) | 1 | |
| 52 | Simple Game | Codeforces | Codeforces Round #316 (Div. 2) | 1 | |
| 53 | Kefa and Company | Codeforces | Codeforces Round #321 (Div. 2) | 1 | |
| 54 | Luxurious Houses | Codeforces | Codeforces Round #322 (Div. 2) | 1 | |
| 55 | Robot's Task | Codeforces | Codeforces Round #323 (Div. 2) | 1 | |
| 56 | Duff in Love | Codeforces | Codeforces Round #326 (Div. 2) | 1 | |
| 57 | The Monster and the Squirrel | Codeforces | Codeforces Round #328 (Div. 2) | 1 | |
| 58 | Wilbur and Array | Codeforces | Codeforces Round #331 (Div. 2) | 1 | |
| 59 | Chocolate | Codeforces | Codeforces Round #340 (Div. 2) | 1 | |
| 60 | Wet Shark and Bishops | Codeforces | Codeforces Round #341 (Div. 2) | 1 | |
| 61 | Beautiful Paintings | Codeforces | Codeforces Round #345 (Div. 2) | 1 | |
| 62 | Game of Robots | Codeforces | Codeforces Round #350 (Div. 2) | 1 | |
| 63 | Different is Good | Codeforces | Codeforces Round #352 (Div. 2) | 1 | |
| 64 | Bear and Finding Criminals | Codeforces | Codeforces Round #356 (Div. 2) | 1 | |
| 65 | Alyona and Mex | Codeforces | Codeforces Round #358 (Div. 2) | 1 | |
| 66 | Lovely Palindromes | Codeforces | Codeforces Round #360 (Div. 2) | 1 | |
| 67 | Cells Not Under Attack | Codeforces | Codeforces Round #364 (Div. 2) | 1 | |
| 68 | Spider Man | Codeforces | Codeforces Round #366 (Div. 2) | 1 | |
| 69 | Interesting drink | Codeforces | Codeforces Round #367 (Div. 2) | 1 | |
| 70 | Bakery | Codeforces | Codeforces Round #368 (Div. 2) | 1 | |
| 71 | Chris and Magic Square | Codeforces | Codeforces Round #369 (Div. 2) | 1 | |
| 72 | Memory and Trident | Codeforces | Codeforces Round #370 (Div. 2) | 1 | |
| 73 | Filya and Homework | Codeforces | Codeforces Round #371 (Div. 2) | 1 | |
| 74 | Complete the Word | Codeforces | Codeforces Round #372 (Div. 2) | 1 | |
| 75 | Passwords | Codeforces | Codeforces Round #374 (Div. 2) | 1 | |
| 76 | Text Document Analysis | Codeforces | Codeforces Round #375 (Div. 2) | 1 | |
| 77 | Arrival of the General | Codeforces | Codeforces Round #103 (Div. 2) | 1 | |
| 78 | Cormen --- The Best Friend Of a Man | Codeforces | Codeforces Round #377 (Div. 2) | 1 | |
| 79 | Parade | Codeforces | Codeforces Round #378 (Div. 2) | 1 | |
| 80 | Anton and Digits | Codeforces | Codeforces Round #379 (Div. 2) | 1 | |
| 81 | Soldier and Bananas | Codeforces | Codeforces Round #304 (Div. 2) | 1 | |
| 82 | Decoding | Codeforces | Codeforces Round #386 (Div. 2) | 1 | |
| 83 | Chloe and the sequence | Codeforces | Codeforces Round #384 (Div. 2) | 1 | |
| 84 | Blown Garland | Codeforces | Codeforces Round #392 (Div. 2) | 1 | |
| 85 | Tetrahedron | Codeforces | Codeforces Round #113 (Div. 2) | 1 | |
| 86 | Mahmoud and a Triangle | Codeforces | Codeforces Round #396 (Div. 2) | 1 | |
| 87 | Timofey and cubes | Codeforces | Codeforces Round #395 (Div. 2) | 1 | |
| 88 | Sherlock and his girlfriend | Codeforces | ICM Technex 2017 and Codeforces Round #400 (Div. 1 + Div. 2, combined) | 1 | |
| 89 | Weird Rounding | Codeforces | Codeforces Round #402 (Div. 2) | 1 | |
| 90 | Anton and Classes | Codeforces | Codeforces Round #404 (Div. 2) | 1 | |
| 91 | 3-palindrome | Codeforces | Codeforces Round #411 (Div. 2) | 1 | |
| 92 | Bear and Elections | Codeforces | Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) | 1 | |
| 93 | Godsend | Codeforces | Codeforces Round #429 (Div. 2) | 1 | |
| 94 | The number on the board | Codeforces | Codeforces Round #427 (Div. 2) | 1 | |
| 95 | Keyboard Layouts | Codeforces | Codeforces Round #424 (Div. 2, rated, based on VK Cup Finals) | 1 | |
| 96 | Crossword solving | Codeforces | Codeforces Round #422 (Div. 2) | 1 | |
| 97 | The Eternal Immortality | Codeforces | Codeforces Round #439 (Div. 2) | 1 | |
| 98 | Hamster Farm | Codeforces | Codeforces Round #464 (Div. 2) | 1 | |
| 99 | Towers | Codeforces | Codeforces Beta Round #37 | 1 | |
| 100 | Registration System | Codeforces | Codeforces Beta Round #4 (Div. 2 Only) | 1 | |
| 101 | Jzzhu and Children | Codeforces | Codeforces Round #257 (Div. 2) | 1 | |
| 102 | Cards | Codeforces | Codeforces Round #364 (Div. 2) | 1 | |
| 103 | Coins | Codeforces | Codeforces Beta Round #54 (Div. 2) | 2 | |
| 104 | Petya and Countryside | Codeforces | Codeforces Beta Round #61 (Div. 2) | 2 | |
| 105 | Lucky Numbers (easy) | Codeforces | Codeforces Beta Round #77 (Div. 2 Only) | 2 | |
| 106 | Sum of Digits | Codeforces | Codeforces Beta Round #79 (Div. 2 Only) | 2 | |
| 107 | Little Pigs and Wolves | Codeforces | Codeforces Beta Round #87 (Div. 2 Only) | 2 | |
| 108 | Lucky Substring | Codeforces | Codeforces Beta Round #91 (Div. 2 Only) | 2 | |
| 109 | Opposites Attract | Codeforces | Codeforces Beta Round #95 (Div. 2) | 2 | |
| 110 | Permutation | Codeforces | Codeforces Beta Round #98 (Div. 2) | 2 | |
| 111 | Combination | Codeforces | Codeforces Round #109 (Div. 2) | 2 | |
| 112 | Trace | Codeforces | Codeforces Round #110 (Div. 2) | 2 | |
| 113 | Unlucky Ticket | Codeforces | Codeforces Round #111 (Div. 2) | 2 | |
| 114 | Burning Midnight Oil | Codeforces | Codeforces Round #112 (Div. 2) | 2 | |
| 115 | Airport | Codeforces | Codeforces Round #134 (Div. 2) | 2 | |
| 116 | Effective Approach | Codeforces | Codeforces Round #140 (Div. 2) | 2 | |
| 117 | Big Segment | Codeforces | Codeforces Round #149 (Div. 2) | 2 | |
| 118 | Increase and Decrease | Codeforces | Codeforces Round #151 (Div. 2) | 2 | |
| 119 | Little Elephant and Magic Square | Codeforces | Codeforces Round #157 (Div. 2) | 2 | |
| 120 | Squares | Codeforces | Codeforces Round #161 (Div. 2) | 2 | |
| 121 | Prime Matrix | Codeforces | Codeforces Round #166 (Div. 2) | 2 | |
| 122 | Painting Eggs | Codeforces | Codeforces Round #173 (Div. 2) | 2 | |
| 123 | Find Marble | Codeforces | Codeforces Round #175 (Div. 2) | 2 | |
| 124 | Polo the Penguin and Matrix | Codeforces | Codeforces Round #177 (Div. 2) | 2 | |
| 125 | Sail | Codeforces | Codeforces Round #180 (Div. 2) | 2 | |
| 126 | Archer | Codeforces | Codeforces Round #185 (Div. 2) | 2 | |
| 127 | Strings of Power | Codeforces | Codeforces Round #188 (Div. 2) | 2 | |
| 128 | Ciel and Flowers | Codeforces | Codeforces Round #190 (Div. 2) | 2 | |
| 129 | Simple Molecules | Codeforces | Codeforces Round #200 (Div. 2) | 2 | |
| 130 | Fixed Points | Codeforces | Codeforces Round #201 (Div. 2) | 2 | |
| 131 | Color the Fence | Codeforces | Codeforces Round #202 (Div. 2) | 2 | |
| 132 | Jeff and Periods | Codeforces | Codeforces Round #204 (Div. 2) | 2 | |
| 133 | Petya and Staircases | Codeforces | Codeforces Round #212 (Div. 2) | 2 | |
| 134 | The Fibonacci Segment | Codeforces | Codeforces Round #213 (Div. 2) | 2 | |
| 135 | Bear and Strings | Codeforces | Codeforces Round #226 (Div. 2) | 2 | |
| 136 | George and Round | Codeforces | Codeforces Round #227 (Div. 2) | 2 | |
| 137 | Fox and Cross | Codeforces | Codeforces Round #228 (Div. 2) | 2 | |
| 138 | Football Kit | Codeforces | Codeforces Round #246 (Div. 2) | 2 | |
| 139 | Shower Line | Codeforces | Codeforces Round #247 (Div. 2) | 2 | |
| 140 | DZY Loves Chemistry | Codeforces | Codeforces Round #254 (Div. 2) | 2 | |
| 141 | Little Dima and Equation | Codeforces | Codeforces Round #262 (Div. 2) | 2 | |
| 142 | Appleman and Card Game | Codeforces | Codeforces Round #263 (Div. 2) | 2 | |
| 143 | Chat Online | Codeforces | Codeforces Round #268 (Div. 2) | 2 | |
| 144 | MUH and Important Things | Codeforces | Codeforces Round #269 (Div. 2) | 2 | |
| 145 | Design Tutorial: Learn from Life | Codeforces | Codeforces Round #270 | 2 | |
| 146 | Towers | Codeforces | Codeforces Round #274 (Div. 2) | 2 | |
| 147 | Valuable Resources | Codeforces | Codeforces Round #276 (Div. 2) | 2 | |
| 148 | Vasya and Wrestling | Codeforces | Codeforces Round #281 (Div. 2) | 2 | |
| 149 | Mr. Kitayuta's Colorful Graph | Codeforces | Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) & Codeforces Round #286 (Div. 2) | 2 | |
| 150 | Painting Pebbles | Codeforces | Codeforces Round #289 (Div. 2, ACM ICPC Rules) | 2 | |
| 151 | Fox And Two Dots | Codeforces | Codeforces Round #290 (Div. 2) | 2 | |
| 152 | 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 | |
| 153 | Tanya and Postcard | Codeforces | Codeforces Round #293 (Div. 2) | 2 | |
| 154 | Pasha and String | Codeforces | Codeforces Round #297 (Div. 2) | 2 | |
| 155 | Covered Path | Codeforces | Codeforces Round #298 (Div. 2) | 2 | |
| 156 | Sea and Islands | Codeforces | Codeforces Round #302 (Div. 2) | 2 | |
| 157 | Mike and Fun | Codeforces | Codeforces Round #305 (Div. 2) | 2 | |
| 158 | Ohana Cleans Up | Codeforces | Codeforces Round #309 (Div. 2) | 2 | |
| 159 | Case of Fake Numbers | Codeforces | Codeforces Round #310 (Div. 2) | 2 | |
| 160 | Pasha and Tea | Codeforces | Codeforces Round #311 (Div. 2) | 2 | |
| 161 | Amr and The Large Array | Codeforces | Codeforces Round #312 (Div. 2) | 2 | |
| 162 | Gerald is into Art | Codeforces | Codeforces Round #313 (Div. 2) | 2 | |
| 163 | Inventory | Codeforces | Codeforces Round #315 (Div. 2) | 2 | |
| 164 | Bear and Three Musketeers | Codeforces | Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) | 2 | |
| 165 | Modulo Sum | Codeforces | Codeforces Round #319 (Div. 2) | 2 | |
| 166 | Kolya and Tanya | Codeforces | Codeforces Round #324 (Div. 2) | 2 | |
| 167 | Laurenty and Shop | Codeforces | Codeforces Round #325 (Div. 2) | 2 | |
| 168 | Rebranding | Codeforces | Codeforces Round #327 (Div. 2) | 2 | |
| 169 | Approximating a Constant Range | Codeforces | Codeforces Round #333 (Div. 2) | 2 | |
| 170 | More Cowbell | Codeforces | Codeforces Round #334 (Div. 2) | 2 | |
| 171 | Vika and Squares | Codeforces | Codeforces Round #337 (Div. 2) | 2 | |
| 172 | Gena's Code | Codeforces | Codeforces Round #339 (Div. 2) | 2 | |
| 173 | War of the Corporations | Codeforces | Codeforces Round #342 (Div. 2) | 2 | |
| 174 | Far Relative’s Problem | Codeforces | Codeforces Round #343 (Div. 2) | 2 | |
| 175 | Print Check | Codeforces | Codeforces Round #344 (Div. 2) | 2 | |
| 176 | Qualifying Contest | Codeforces | Codeforces Round #346 (Div. 2) | 2 | |
| 177 | Little Artem and Grasshopper | Codeforces | VK Cup 2016 - Round 2 | 2 | |
| 178 | Restoring Painting | Codeforces | Codeforces Round #353 (Div. 2) | 2 | |
| 179 | Vanya and Food Processor | Codeforces | Codeforces Round #355 (Div. 2) | 2 | |
| 180 | Economy Game | Codeforces | Codeforces Round #357 (Div. 2) | 2 | |
| 181 | Little Robber Girl's Zoo | Codeforces | Codeforces Round #359 (Div. 2) | 2 | |
| 182 | Barnicle | Codeforces | Codeforces Round #362 (Div. 2) | 2 | |
| 183 | One Bomb | Codeforces | Codeforces Round #363 (Div. 2) | 2 | |
| 184 | Mishka and trip | Codeforces | Codeforces Round #365 (Div. 2) | 2 | |
| 185 | Anatoly and Cockroaches | Codeforces | Codeforces Round #373 (Div. 2) | 2 | |
| 186 | Coupons and Discounts | Codeforces | Codeforces Round #376 (Div. 2) | 2 | |
| 187 | Divisibility | Codeforces | Experimental Educational Round: VolBIT Formulas Blitz | 2 | |
| 188 | Alyona and flowers | Codeforces | Codeforces Round #381 (Div. 2) | 2 | |
| 189 | Urbanization | Codeforces | Codeforces Round #382 (Div. 2) | 2 | |
| 190 | Arpa’s obvious problem and Mehrdad’s terrible solution | Codeforces | Codeforces Round #383 (Div. 2) | 2 | |
| 191 | Parallelogram is Back | Codeforces | Codeforces Round #388 (Div. 2) | 2 | |
| 192 | Mammoth's Genome Decoding | Codeforces | Codeforces Round #387 (Div. 2) | 2 | |
| 193 | Bash's Big Day | Codeforces | Codecraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined) | 2 | |
| 194 | Ilya and tic-tac-toe game | Codeforces | Codeforces Round #390 (Div. 2) | 2 | |
| 195 | Dasha and friends | Codeforces | Codeforces Round #394 (Div. 2) | 2 | |
| 196 | Code obfuscation | Codeforces | Codeforces Round #397 by Kaspersky Lab and Barcelona Bootcamp (Div. 1 + Div. 2 combined) | 2 | |
| 197 | Game of Credit Cards | Codeforces | Codeforces Round #401 (Div. 2) | 2 | |
| 198 | Bear and Friendship Condition | Codeforces | VK Cup 2017 - Round 1 | 2 | |
| 199 | Not Afraid | Codeforces | Codeforces Round #406 (Div. 2) | 2 | |
| 200 | Find The Bone | Codeforces | Codeforces Round #408 (Div. 2) | 2 | |
| 201 | Vladik and Complicated Book | Codeforces | Codeforces Round #416 (Div. 2) | 2 | |
| 202 | Summer sell-off | Codeforces | Codeforces Round #415 (Div. 2) | 2 | |
| 203 | Mike and strings | Codeforces | Codeforces Round #410 (Div. 2) | 2 | |
| 204 | Valued Keys | Codeforces | Codeforces Round #409 (rated, Div. 2, based on VK Cup 2017 Round 2) | 2 | |
| 205 | Karen and Coffee | Codeforces | Codeforces Round #419 (Div. 2) | 2 | |
| 206 | The Festive Evening | Codeforces | Codeforces Round #426 (Div. 2) | 2 | |
| 207 | Okabe and Banana Trees | Codeforces | Codeforces Round #420 (Div. 2) | 2 | |
| 208 | An express train to reveries | Codeforces | Codeforces Round #418 (Div. 2) | 2 | |
| 209 | Polycarp and Letters | Codeforces | Codeforces Round #436 (Div. 2) | 2 | |
| 210 | Divisiblity of Differences | Codeforces | Codeforces Round #441 (Div. 2, by Moscow Team Olympiad) | 2 | |
| 211 | Maximum of Maximums of Minimums | Codeforces | Technocup 2018 - Elimination Round 2 | 2 | |
| 212 | Beautiful Divisors | Codeforces | Educational Codeforces Round 33 (Rated for Div. 2) | 2 | |
| 213 | Proper Nutrition | Codeforces | Codeforces Round #451 (Div. 2) | 2 | |
| 214 | Magic Forest | Codeforces | Codeforces Round #461 (Div. 2) | 2 | |
| 215 | Repeated Substitution with Sed | Live Archive | 2009 | Asia - Tokyo | 2 |
| 216 | The least round way | Codeforces | Codeforces Beta Round #2 | 3 | |
| 217 | President's Office | Codeforces | Codeforces Beta Round #6 (Div. 2 Only) | 3 | |
| 218 | Correct Solution? | Codeforces | Codeforces Beta Round #12 (Div 2 Only) | 3 | |
| 219 | Burglar and Matches | Codeforces | Codeforces Beta Round #16 (Div. 2 Only) | 3 | |
| 220 | Phone numbers | Codeforces | Codeforces Beta Round #25 (Div. 2 Only) | 3 | |
| 221 | Regular Bracket Sequence | Codeforces | Codeforces Beta Round #26 (Codeforces format) | 3 | |
| 222 | Letter | Codeforces | Codeforces Beta Round #42 (Div. 2) | 3 | |
| 223 | Easter Eggs | Codeforces | Codeforces Beta Round #70 (Div. 2) | 3 | |
| 224 | Testing Pants for Sadness | Codeforces | Codeforces Beta Round #80 (Div. 1 Only) & Codeforces Beta Round #80 (Div. 2 Only) | 3 | |
| 225 | Lucky String | Codeforces | Codeforces Beta Round #84 (Div. 2 Only) | 3 | |
| 226 | Canvas Frames | Codeforces | Codeforces Beta Round #93 (Div. 2 Only) | 3 | |
| 227 | Students and Shoelaces | Codeforces | Codeforces Beta Round #94 (Div. 2 Only) | 3 | |
| 228 | Unary | Codeforces | Codeforces Beta Round #96 (Div. 2) | 3 | |
| 229 | Ternary Logic | Codeforces | Codeforces Beta Round #97 (Div. 2) | 3 | |
| 230 | Phone Numbers | Codeforces | Codeforces Round #107 (Div. 2) | 3 | |
| 231 | Vasya's Calendar | Codeforces | Codeforces Round #117 (Div. 2) | 3 | |
| 232 | Little Elephant and Numbers | Codeforces | Codeforces Round #136 (Div. 2) | 3 | |
| 233 | Cosmic Tables | Codeforces | Codeforces Round #137 (Div. 2) | 3 | |
| 234 | Array | Codeforces | Codeforces Round #138 (Div. 2) | 3 | |
| 235 | Non-square Equation | Codeforces | Codeforces Round #144 (Div. 2) | 3 | |
| 236 | Reading | Codeforces | Codeforces Round #145 (Div. 2, ACM-ICPC Rules) | 3 | |
| 237 | Easy Number Challenge | Codeforces | Codeforces Round #146 (Div. 2) | 3 | |
| 238 | Physics Practical | Codeforces | Codeforces Round #154 (Div. 2) | 3 | |
| 239 | Code Parsing | Codeforces | Codeforces Round #156 (Div. 2) | 3 | |
| 240 | Playing Cubes | Codeforces | Codeforces Round #159 (Div. 2) | 3 | |
| 241 | Roma and Changing Signs | Codeforces | Codeforces Round #160 (Div. 2) | 3 | |
| 242 | Multithreading | Codeforces | Codeforces Round #165 (Div. 2) | 3 | |
| 243 | Cows and Poker Game | Codeforces | Codeforces Round #174 (Div. 2) | 3 | |
| 244 | Coach | Codeforces | Codeforces Round #181 (Div. 2) | 3 | |
| 245 | Eugeny and Play List | Codeforces | Codeforces Round #182 (Div. 2) | 3 | |
| 246 | Sereja and Array | Codeforces | Codeforces Round #187 (Div. 2) | 3 | |
| 247 | Ping-Pong (Easy Version) | Codeforces | Codeforces Round #189 (Div. 2) | 3 | |
| 248 | Maximum Absurdity | Codeforces | Codeforces Round #193 (Div. 2) | 3 | |
| 249 | Routine Problem | Codeforces | Codeforces Round #196 (Div. 2) | 3 | |
| 250 | Vasya and Public Transport | Codeforces | Codeforces Round #206 (Div. 2) | 3 | |
| 251 | Flag Day | Codeforces | Codeforces Round #207 (Div. 2) | 3 | |
| 252 | Permutation | Codeforces | Codeforces Round #209 (Div. 2) | 3 | |
| 253 | Levko and Permutation | Codeforces | Codeforces Round #210 (Div. 2) | 3 | |
| 254 | Dima and To-do List | Codeforces | Codeforces Round #214 (Div. 2) | 3 | |
| 255 | Valera and Contest | Codeforces | Codeforces Round #216 (Div. 2) | 3 | |
| 256 | Fox Dividing Cheese | Codeforces | Codeforces Round #218 (Div. 2) | 3 | |
| 257 | Sereja and Stairs | Codeforces | Codeforces Round #223 (Div. 2) | 3 | |
| 258 | Inna and New Matrix of Candies | Codeforces | Codeforces Round #234 (Div. 2) | 3 | |
| 259 | Sereja and Contests | Codeforces | Codeforces Round #235 (Div. 2) | 3 | |
| 260 | Domino Effect | Codeforces | Codeforces Round #238 (Div. 2) | 3 | |
| 261 | Garland | Codeforces | Codeforces Round #239 (Div. 2) | 3 | |
| 262 | Mashmokh and Tokens | Codeforces | Codeforces Round #240 (Div. 2) | 3 | |
| 263 | Art Union | Codeforces | Codeforces Round #241 (Div. 2) | 3 | |
| 264 | Megacity | Codeforces | Codeforces Round #242 (Div. 2) | 3 | |
| 265 | Pasha Maximizes | Codeforces | Codeforces Round #249 (Div. 2) | 3 | |
| 266 | The Child and Set | Codeforces | Codeforces Round #250 (Div. 2) | 3 | |
| 267 | Valera and Fruits | Codeforces | Codeforces Round #252 (Div. 2) | 3 | |
| 268 | Queue | Codeforces | Codeforces Round #279 (Div. 2) | 3 | |
| 269 | Modular Equations | Codeforces | Codeforces Round #282 (Div. 2) | 3 | |
| 270 | Secret Combination | Codeforces | Codeforces Round #283 (Div. 2) | 3 | |
| 271 | Error Correct System | Codeforces | Codeforces Round #296 (Div. 2) | 3 | |
| 272 | School Marks | Codeforces | Codeforces Round #301 (Div. 2) | 3 | |
| 273 | Order Book | Codeforces | Codeforces Round #317 [AimFund Thanks-Round] (Div. 2) | 3 | |
| 274 | Finding Team Member | Codeforces | Codeforces Round #320 (Div. 2) [Bayan Thanks-Round] | 3 | |
| 275 | Anton and Lines | Codeforces | Codeforces Round #329 (Div. 2) | 3 | |
| 276 | Spongebob and Joke | Codeforces | Codeforces Round #332 (Div. 2) | 3 | |
| 277 | Hamming Distance Sum | Codeforces | Codeforces Round #336 (Div. 2) | 3 | |
| 278 | Longtail Hedgehog | Codeforces | Codeforces Round #338 (Div. 2) | 3 | |
| 279 | Coat of Anticubism | Codeforces | Codeforces Round #349 (Div. 2) | 3 | |
| 280 | Pyramid of Glasses | Codeforces | Codeforces Round #354 (Div. 2) | 3 | |
| 281 | Mike and Shortcuts | Codeforces | Codeforces Round #361 (Div. 2) | 3 | |
| 282 | Spotlights | Codeforces | Technocup 2017 - Elimination Round 2 | 3 | |
| 283 | Hongcow Solves A Puzzle | Codeforces | Codeforces Round #385 (Div. 2) | 3 | |
| 284 | Santa Claus and Keyboard Check | Codeforces | Technocup 2017 - Elimination Round 3 | 3 | |
| 285 | Frodo and pillows | Codeforces | Codeforces Round #393 (Div. 2) (8VC Venture Cup 2017 - Final Round Div. 2 Edition) | 3 | |
| 286 | Code For 1 | Codeforces | Divide by Zero 2017 and Codeforces Round #399 (Div. 1 + Div. 2, combined) | 3 | |
| 287 | The Meeting Place Cannot Be Changed | Codeforces | ?????????? 2017 - ????? (?????? ??? ??????-??????????) | 3 | |
| 288 | Masha and geometric depression | Codeforces | Codeforces Round #407 (Div. 2) | 3 | |
| 289 | Sagheer, the Hausmeister | Codeforces | Codeforces Round #417 (Div. 2) | 3 | |
| 290 | Cutting Carrot | Codeforces | Tinkoff Challenge - Final Round (Codeforces Round #414, rated, Div. 1 + Div. 2) | 3 | |
| 291 | T-shirt buying | Codeforces | Playrix Codescapes Cup (Codeforces Round #413, rated, Div. 1 + Div. 2) | 3 | |
| 292 | T-Shirt Hunt | Codeforces | Codeforces Round #412 (rated, Div. 2, base on VK Cup 2017 Round 3) | 3 | |
| 293 | Petya and Exam | Codeforces | Codeforces Round #425 (Div. 2) | 3 | |
| 294 | Luba And The Ticket | Codeforces | Educational Codeforces Round 27 | 3 | |
| 295 | Black Square | Codeforces | Codeforces Round #423 (Div. 2, rated, based on VK Cup Finals) | 3 | |
| 296 | Mister B and Angle in Polygon | Codeforces | Codeforces Round #421 (Div. 2) | 3 | |
| 297 | Balanced Substring | Codeforces | Educational Codeforces Round 30 | 3 | |
| 298 | Lorry | Codeforces | Codeforces Beta Round #3 | 4 | |
| 299 | Center Alignment | Codeforces | Codeforces Beta Round #5 | 4 | |
| 300 | Running Student | Codeforces | Codeforces Beta Round #9 (Div. 2 Only) | 4 | |
| 301 | Young Photographer | Codeforces | Codeforces Beta Round #14 (Div. 2) | 4 | |
| 302 | Tournament | Codeforces | Codeforces Beta Round #27 (Codeforces format, Div. 2) | 4 | |
| 303 | Coins | Codeforces | Codeforces Beta Round #44 (Div. 2) | 4 | |
| 304 | Choosing Symbol Pairs | Codeforces | Codeforces Beta Round #47 | 4 | |
| 305 | Fortune Telling | Codeforces | Codeforces Beta Round #55 (Div. 2) | 4 | |
| 306 | Serial Time! | Codeforces | Codeforces Beta Round #56 | 4 | |
| 307 | Hard Work | Codeforces | Codeforces Beta Round #57 (Div. 2) | 4 | |
| 308 | Settlers' Training | Codeforces | Codeforces Beta Round #59 (Div. 2) | 4 | |
| 309 | Progress Bar | Codeforces | Codeforces Beta Round #65 (Div. 2) | 4 | |
| 310 | Depression | Codeforces | Codeforces Beta Round #69 (Div. 2 Only) | 4 | |
| 311 | Magical Array | Codeforces | Codeforces Beta Round #72 (Div. 1 Only) & Codeforces Beta Round #72 (Div. 2 Only) | 4 | |
| 312 | African Crossword | Codeforces | Codeforces Beta Round #74 (Div. 2 Only) | 4 | |
| 313 | Binary Number | Codeforces | Codeforces Beta Round #75 (Div. 2 Only) | 4 | |
| 314 | Choosing Laptop | Codeforces | Codeforces Beta Round #82 (Div. 2) | 4 | |
| 315 | Petya and Square | Codeforces | Codeforces Beta Round #85 (Div. 2 Only) | 4 | |
| 316 | Hopscotch | Codeforces | Codeforces Round #101 (Div. 2) | 4 | |
| 317 | Help Kingdom of Far Far Away 2 | Codeforces | Codeforces Round #102 (Div. 2) | 4 | |
| 318 | Meeting | Codeforces | Codeforces Round #103 (Div. 2) | 4 | |
| 319 | Lucky Mask | Codeforces | Codeforces Round #104 (Div. 2) | 4 | |
| 320 | Escape | Codeforces | Codeforces Round #105 (Div. 2) | 4 | |
| 321 | Steps | Codeforces | Codeforces Round #108 (Div. 2) | 4 | |
| 322 | Growing Mushrooms | Codeforces | Codeforces Round #118 (Div. 2) | 4 | |
| 323 | Counting Rhombi | Codeforces | Codeforces Round #119 (Div. 2) | 4 | |
| 324 | Walking in the Rain | Codeforces | Codeforces Round #121 (Div. 2) | 4 | |
| 325 | Square | Codeforces | Codeforces Round #122 (Div. 2) | 4 | |
| 326 | After Training | Codeforces | Codeforces Round #123 (Div. 2) | 4 | |
| 327 | Limit | Codeforces | Codeforces Round #124 (Div. 2) | 4 | |
| 328 | Little Elephant and Sorting | Codeforces | Codeforces Round #129 (Div. 2) | 4 | |
| 329 | Hometask | Codeforces | Codeforces Round #131 (Div. 2) | 4 | |
| 330 | Olympic Medal | Codeforces | Codeforces Round #132 (Div. 2) | 4 | |
| 331 | Forming Teams | Codeforces | Codeforces Round #133 (Div. 2) | 4 | |
| 332 | Special Offer! Super Price 999 Bourles! | Codeforces | Codeforces Round #135 (Div. 2) | 4 | |
| 333 | Well-known Numbers | Codeforces | Codeforces Round #139 (Div. 2) | 4 | |
| 334 | Two Tables | Codeforces | Codeforces Round #141 (Div. 2) | 4 | |
| 335 | Magic, Wizardry and Wonders | Codeforces | Codeforces Round #143 (Div. 2) | 4 | |
| 336 | Undoubtedly Lucky Numbers | Codeforces | Codeforces Round #150 (Div. 2) | 4 | |
| 337 | Chilly Willy | Codeforces | Codeforces Round #152 (Div. 2) | 4 | |
| 338 | Ancient Prophesy | Codeforces | Codeforces Round #158 (Div. 2) | 4 | |
| 339 | Dima and Sequence | Codeforces | Codeforces Round #167 (Div. 2) | 4 | |
| 340 | New Problem | Codeforces | Codeforces Round #170 (Div. 2) | 4 | |
| 341 | Pipeline | Codeforces | Codeforces Round #176 (Div. 2) | 4 | |
| 342 | Shaass and Bookshelf | Codeforces | Codeforces Round #178 (Div. 2) | 4 | |
| 343 | Eight Point Sets | Codeforces | Codeforces Round #194 (Div. 2) | 4 | |
| 344 | Xenia and Spies | Codeforces | Codeforces Round #199 (Div. 2) | 4 | |
| 345 | Resort | Codeforces | Codeforces Round #203 (Div. 2) | 4 | |
| 346 | Dima and Text Messages | Codeforces | Codeforces Round #208 (Div. 2) | 4 | |
| 347 | Inna and Nine | Codeforces | Codeforces Round #220 (Div. 2) | 4 | |
| 348 | I.O.U. | Codeforces | Codeforces Round #221 (Div. 2) | 4 | |
| 349 | Semifinals | Codeforces | Codeforces Round #222 (Div. 2) | 4 | |
| 350 | Multitasking | Codeforces | Codeforces Round #225 (Div. 2) | 4 | |
| 351 | Trees in a Row | Codeforces | Codeforces Round #236 (Div. 2) | 4 | |
| 352 | Marathon | Codeforces | Codeforces Round #237 (Div. 2) | 4 | |
| 353 | Sereja and Mirroring | Codeforces | Codeforces Round #243 (Div. 2) | 4 | |
| 354 | Balls Game | Codeforces | Codeforces Round #245 (Div. 2) | 4 | |
| 355 | Kolya and Tandem Repeat | Codeforces | Codeforces Round #253 (Div. 2) | 4 | |
| 356 | Wonder Room | Codeforces | Codeforces Round #266 (Div. 2) | 4 | |
| 357 | Friends and Presents | Codeforces | Codeforces Round #275 (Div. 2) | 4 | |
| 358 | ZgukistringZ | Codeforces | Codeforces Round #307 (Div. 2) | 4 | |
| 359 | Pasha and Phone | Codeforces | Codeforces Round #330 (Div. 2) | 4 | |
| 360 | Testing Robots | Codeforces | Codeforces Round #335 (Div. 2) | 4 | |
| 361 | Rebus | Codeforces | Codeforces Round #347 (Div. 1) & Codeforces Round #347 (Div. 2) | 4 | |
| 362 | Problems for Round | Codeforces | Codeforces Round #351 (VK Cup 2016 Round 3, Div. 2 Edition) | 4 | |
| 363 | Game of the Rows | Codeforces | Codeforces Round #428 (Div. 2) | 4 | |
| 364 | Race Against Time | Codeforces | Codeforces Round #438 by Sberbank and Barcelona Bootcamp (Div. 1 + Div. 2 combined) | 4 | |
| 365 | Binary Search | Live Archive | 2000 | Europe - Northeastern | 4 |
| 366 | Memory Manager | Codeforces | Codeforces Beta Round #7 | 5 | |
| 367 | Obsession with Robots | Codeforces | Codeforces Beta Round #8 | 5 | |
| 368 | Jumping Jack | Codeforces | Codeforces Beta Round #11 | 5 | |
| 369 | Hierarchy | Codeforces | Codeforces Beta Round #17 | 5 | |
| 370 | Checkout Assistant | Codeforces | Codeforces Beta Round #19 | 5 | |
| 371 | Equation | Codeforces | Codeforces Alpha Round #20 (Codeforces format) | 5 | |
| 372 | Bargaining Table | Codeforces | Codeforces Beta Round #22 (Div. 2 Only) | 5 | |
| 373 | pSort | Codeforces | Codeforces Beta Round #28 (Codeforces format) | 5 | |
| 374 | Sysadmin Bob | Codeforces | Codeforces Beta Round #31 (Div. 2, Codeforces format) | 5 | |
| 375 | Chess | Codeforces | School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round #38 (ACM-ICPC Rules) | 5 | |
| 376 | Martian Dollar | Codeforces | Codeforces Beta Round #40 (Div. 2) | 5 | |
| 377 | T-shirts from Sponsor | Codeforces | School Personal Contest #2 (Winter Computer School 2010/11) - Codeforces Beta Round #43 (ACM-ICPC Rules) | 5 | |
| 378 | Sum | Codeforces | Codeforces Beta Round #46 (Div. 2) | 5 | |
| 379 | Spoilt Permutation | Codeforces | Codeforces Beta Round #52 (Div. 2) | 5 | |
| 380 | Energy exchange | Codeforces | Codeforces Beta Round #62 | 5 | |
| 381 | Bets | Codeforces | Codeforces Beta Round #63 (Div. 2) | 5 | |
| 382 | Facetook Priority Wall | Codeforces | Codeforces Beta Round #67 (Div. 2) | 5 | |
| 383 | Colorful Field | Codeforces | Codeforces Beta Round #71 | 5 | |
| 384 | Friends | Codeforces | Codeforces Beta Round #76 (Div. 2 Only) | 5 | |
| 385 | Help Chef Gerasim | Codeforces | Codeforces Beta Round #78 (Div. 2 Only) | 5 | |
| 386 | Datatypes | Codeforces | Codeforces Beta Round #83 (Div. 2 Only) | 5 | |
| 387 | PFAST Inc. | Codeforces | Codeforces Beta Round #86 (Div. 2 Only) | 5 | |
| 388 | Permutations | Codeforces | Codeforces Beta Round #92 (Div. 2 Only) | 5 | |
| 389 | Martian Clock | Codeforces | Codeforces Round #106 (Div. 2) | 5 | |
| 390 | Surrounded | Codeforces | Codeforces Round #120 (Div. 2) | 5 | |
| 391 | Game on Paper | Codeforces | Codeforces Round #128 (Div. 2) | 5 | |
| 392 | Young Table | Codeforces | Codeforces Round #147 (Div. 2) | 5 | |
| 393 | Jury Size | Codeforces | Codeforces Round #155 (Div. 2) | 5 | |
| 394 | Convex Shape | Codeforces | Codeforces Round #168 (Div. 2) | 5 | |
| 395 | Nearest Fraction | Codeforces | Codeforces Round #172 (Div. 2) | 5 | |
| 396 | Calendar | Codeforces | Codeforces Round #183 (Div. 2) | 5 | |
| 397 | Continued Fractions | Codeforces | Codeforces Round #184 (Div. 2) | 5 | |
| 398 | Two Heaps | Codeforces | Codeforces Round #205 (Div. 2) | 5 | |
| 399 | Berland Bingo | Codeforces | Codeforces Round #217 (Div. 2) | 5 | |
| 400 | Making Sequences is Fun | Codeforces | Codeforces Round #219 (Div. 2) | 5 | |
| 401 | Candy Boxes | Codeforces | Codeforces Round #278 (Div. 2) | 5 | |
| 402 | Balancer | Codeforces | Testing Round #10 | 5 | |
| 403 | The Queue | Codeforces | Codeforces Round #398 (Div. 2) | 5 | |
| 404 | Cinema Cashier | Codeforces | Codeforces Beta Round #10 | 6 | |
| 405 | Platforms | Codeforces | Codeforces Beta Round #18 (Div. 2 Only) | 6 | |
| 406 | Party | Codeforces | Codeforces Beta Round #23 | 6 | |
| 407 | F1 Champions | Codeforces | Codeforces Beta Round #24 | 6 | |
| 408 | Traffic Lights | Codeforces | Codeforces Beta Round #29 (Div. 2, Codeforces format) | 6 | |
| 409 | String Problem | Codeforces | Codeforces Beta Round #33 (Codeforces format) | 6 | |
| 410 | Land Lot | Codeforces | School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) | 6 | |
| 411 | Smallest number | Codeforces | Codeforces Beta Round #51 | 6 | |
| 412 | Tyndex.Brome | Codeforces | Codeforces Beta Round #58 | 6 | |
| 413 | Harry Potter and the History of Magic | Codeforces | Codeforces Beta Round #60 | 6 | |
| 414 | Text Messaging | Codeforces | Codeforces Beta Round #64 | 6 | |
| 415 | Train | Codeforces | Codeforces Beta Round #68 | 6 | |
| 416 | Keyboard | Codeforces | Codeforces Beta Round #73 (Div. 2 Only) | 6 | |
| 417 | Very Interesting Game | Codeforces | Codeforces Beta Round #88 | 6 | |
| 418 | Wallpaper | Codeforces | Codeforces Beta Round #99 (Div. 2) | 6 | |
| 419 | New Year Cards | Codeforces | Codeforces Round #100 | 6 | |
| 420 | Polygons | Codeforces | Codeforces Round #113 (Div. 2) | 6 | |
| 421 | Wizards and Minimal Spell | Codeforces | Codeforces Round #114 (Div. 2) | 6 | |
| 422 | Plane of Tanks: Pro | Codeforces | Codeforces Round #115 | 6 | |
| 423 | Solitaire | Codeforces | Codeforces Round #130 (Div. 2) | 6 | |
| 424 | Easy Tape Programming | Codeforces | Codeforces Round #148 (Div. 2) | 6 | |
| 425 | Unsorting Array | Codeforces | Codeforces Round #153 (Div. 2) | 6 | |
| 426 | Vasily the Bear and Fly | Codeforces | Codeforces Round #195 (Div. 2) | 6 | |
| 427 | Maximal Area Quadrilateral | Codeforces | Codeforces Round #198 (Div. 2) | 6 | |
| 428 | Number Busters | Codeforces | Codeforces Round #224 (Div. 2) | 6 | |
| 429 | Red and Blue Balls | Codeforces | Codeforces Round #233 (Div. 2) | 6 | |
| 430 | Binary Search Tree | UVA | 6 | ||
| 431 | Laser | Codeforces | Codeforces Beta Round #15 | 7 | |
| 432 | Intersection | Codeforces | Codeforces Alpha Round #21 (Codeforces format) | 7 | |
| 433 | Codeforces World Finals | Codeforces | Codeforces Beta Round #30 (Codeforces format) | 7 | |
| 434 | Warehouse | Codeforces | Codeforces Beta Round #35 (Div. 2) | 7 | |
| 435 | Fractal | Codeforces | Codeforces Beta Round #36 | 7 | |
| 436 | Computer Game | Codeforces | Codeforces Beta Round #37 | 7 | |
| 437 | Repaintings | Codeforces | Codeforces Beta Round #39 | 7 | |
| 438 | Game of chess unfinished | Codeforces | Codeforces Beta Round #41 | 7 | |
| 439 | bHTML Tables Analisys | Codeforces | Codeforces Beta Round #48 | 7 | |
| 440 | Blog Photo | Codeforces | Codeforces Beta Round #49 (Div. 2) | 7 | |
| 441 | Martian Architecture | Codeforces | Codeforces Beta Round #53 | 7 | |
| 442 | Dark Assembly | Codeforces | Codeforces Beta Round #81 | 7 | |
| 443 | Before Exam | Codeforces | Codeforces Beta Round #90 | 7 | |
| 444 | Brand New Easy Problem | Codeforces | Codeforces Round #127 (Div. 2) | 7 | |
| 445 | Yaroslav and Two Strings | Codeforces | Codeforces Round #179 (Div. 2) | 7 | |
| 446 | Inna, Dima and Song | Codeforces | Codeforces Round #229 (Div. 2) | 7 | |
| 447 | Three matrices | Codeforces | Codeforces Round #230 (Div. 2) | 7 | |
| 448 | On Corruption and Numbers | Codeforces | Codeforces Round #232 (Div. 2) | 7 | |
| 449 | Rooks and Rectangles | Codeforces | VK Cup 2015 - Round 1 | 7 | |
| 450 | Decode | Live Archive | 1990 | North America - East Central NA | 7 |
| 451 | Letter A | Codeforces | Codeforces Beta Round #13 | 8 | |
| 452 | Cutting Jigsaw Puzzle | Codeforces | Codeforces Beta Round #50 | 8 | |
| 453 | Need For Brake | Codeforces | Codeforces Beta Round #66 | 8 | |
| 454 | Special Olympics | Codeforces | Codeforces Round #125 (Div. 2) | 8 | |
| 455 | Very Beautiful Number | Codeforces | Codeforces Round #231 (Div. 2) | 8 | |
| 456 | Divisibility Rules | Codeforces | Codeforces Round #116 (Div. 2, ACM-ICPC Rules) | 9 | |
| 457 | Fence | A2 Online Judge | 9 |