| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | K-based Numbers | Timus | 1 | ||
| 2 | Histogram | SPOJ | 1 | ||
| 3 | Assignments | SPOJ | 1 | ||
| 4 | Fedor and New Game | Codeforces | Codeforces Round #267 (Div. 2) | 1 | |
| 5 | Raising Bacteria | Codeforces | Codeforces Round #320 (Div. 2) [Bayan Thanks-Round] | 1 | |
| 6 | Preparing Olympiad | Codeforces | Codeforces Round #306 (Div. 2) | 1 | |
| 7 | Tavas and SaDDas | Codeforces | Codeforces Round #299 (Div. 2) | 1 | |
| 8 | Dreamoon and WiFi | Codeforces | Codeforces Round #272 (Div. 2) | 1 | |
| 9 | LATGACH3 | SPOJ | 1 | ||
| 10 | Chloe and the sequence | Codeforces | Codeforces Round #384 (Div. 2) | 1 | |
| 11 | Lucky Numbers (easy) | Codeforces | Codeforces Beta Round #77 (Div. 2 Only) | 2 | |
| 12 | Lineup | SPOJ | 2 | ||
| 13 | Candles | Live Archive | 2011 | Asia - Dhaka | 2 |
| 14 | False Mirrors | Timus | 2 | ||
| 15 | Bits | Codeforces | Codeforces Round #276 (Div. 1) & Codeforces Round #276 (Div. 2) | 2 | |
| 16 | Pebbles | Live Archive | 2007 | North America - Pacific Northwest & North America - Southern California | 2 |
| 17 | Array | Codeforces | Codeforces Round #138 (Div. 2) | 3 | |
| 18 | PICK UP DROP ESCAPE | SPOJ | 3 | ||
| 19 | Fetching Cooking Tools | CodeChef | 3 | ||
| 20 | The Child and Set | Codeforces | Codeforces Round #250 (Div. 2) | 3 | |
| 21 | Kefa and Dishes | Codeforces | Codeforces Round #321 (Div. 2) | 3 | |
| 22 | Little Girl and Maximum XOR | Codeforces | Codeforces Round #169 (Div. 2) | 3 | |
| 23 | LLPS | Codeforces | Codeforces Round #127 (Div. 2) | 3 | |
| 24 | Short Program | Codeforces | Codeforces Round #443 (Div. 1) & Codeforces Round #443 (Div. 2) | 3 | |
| 25 | Sagheer, the Hausmeister | Codeforces | Codeforces Round #417 (Div. 2) | 3 | |
| 26 | Undoubtedly Lucky Numbers | Codeforces | Codeforces Round #150 (Div. 2) | 4 | |
| 27 | The Brand New Function | Codeforces | Codeforces Round #150 (Div. 1) & Codeforces Round #150 (Div. 2) | 4 | |
| 28 | Tournament | Codeforces | Codeforces Beta Round #27 (Codeforces format, Div. 2) | 4 | |
| 29 | And Or | UVA | 4 | ||
| 30 | Three Logos | Codeforces | Codeforces Round #322 (Div. 2) | 4 | |
| 31 | Permutations | Codeforces | Rockethon 2015 | 4 | |
| 32 | Fox And Jumping | Codeforces | Codeforces Round #290 (Div. 2) & Codeforces Round #290 (Div. 1) | 4 | |
| 33 | Little Pony and Harmony Chest | Codeforces | Codeforces Round #259 (Div. 1) & Codeforces Round #259 (Div. 2) | 4 | |
| 34 | XOR on Segment | Codeforces | Codeforces Round #149 (Div. 2) | 4 | |
| 35 | Compatible Numbers | Codeforces | Codeforces Round #112 (Div. 2) | 5 | |
| 36 | PFAST Inc. | Codeforces | Codeforces Beta Round #86 (Div. 2 Only) | 5 | |
| 37 | A Simple Task | Codeforces | Codeforces Beta Round #11 | 5 | |
| 38 | New Year Tree | Codeforces | Educational Codeforces Round 6 | 5 | |
| 39 | Mike and Foam | Codeforces | Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) | 5 | |
| 40 | Borya and Hanabi | Codeforces | Codeforces Round #253 (Div. 1) & Codeforces Round #253 (Div. 2) | 5 | |
| 41 | Roman and Numbers | Codeforces | Codeforces Round #235 (Div. 2) | 5 | |
| 42 | Fox and Minimal path | Codeforces | Codeforces Round #228 (Div. 1) & Codeforces Round #228 (Div. 2) | 5 | |
| 43 | Sausage Maximization | Codeforces | Codeforces Round #173 (Div. 2) | 5 | |
| 44 | Bitwise Formula | Codeforces | Codeforces Round #402 (Div. 1) & Codeforces Round #402 (Div. 2) | 5 | |
| 45 | Square Subsets | Codeforces | Codeforces Round #448 (Div. 2) | 5 | |
| 46 | Practice | Codeforces | Codeforces Round #145 (Div. 2, ACM-ICPC Rules) & Codeforces Round #145 (Div. 1, ACM-ICPC Rules) | 6 | |
| 47 | Table | Codeforces | Codeforces Round #144 (Div. 1) & Codeforces Round #144 (Div. 2) | 6 | |
| 48 | Fish | Codeforces | Codeforces Beta Round #16 (Div. 2 Only) | 6 | |
| 49 | Looking for Order | Codeforces | Codeforces Beta Round #8 | 6 | |
| 50 | Sereja and Table | Codeforces | Codeforces Round #243 (Div. 1) | 6 | |
| 51 | Anya and Cubes | Codeforces | Codeforces Round #297 (Div. 2) | 6 | |
| 52 | Second price auction | Codeforces | Rockethon 2015 | 6 | |
| 53 | Devu and Flowers | Codeforces | Codeforces Round #258 (Div. 2) | 6 | |
| 54 | Jzzhu and Numbers | Codeforces | Codeforces Round #257 (Div. 1) | 6 | |
| 55 | Random Task | Codeforces | Codeforces Round #247 (Div. 2) | 6 | |
| 56 | Cunning Gena | Codeforces | RCC 2014 Warmup (Div. 2) & RCC 2014 Warmup (Div. 1) | 6 | |
| 57 | New Year Letter | Codeforces | Good Bye 2013 | 6 | |
| 58 | Characteristics of Rectangles | Codeforces | Codeforces Round #194 (Div. 1) | 6 | |
| 59 | Permutation Sum | Codeforces | Codeforces Round #175 (Div. 2) | 6 | |
| 60 | Hongcow's Game | Codeforces | Codeforces Round #385 (Div. 1) & Codeforces Round #385 (Div. 2) | 6 | |
| 61 | Unusual Sequences | Codeforces | Codeforces Round #450 (Div. 2) | 6 | |
| 62 | Mahmoud and a xor trip | Codeforces | Codeforces Round #396 (Div. 2) | 6 | |
| 63 | Vladik and cards | Codeforces | Codeforces Round #384 (Div. 2) | 6 | |
| 64 | Train Passengers | A2 Online Judge | 6 | ||
| 65 | Snake | Codeforces | Codeforces Round #139 (Div. 2) | 7 | |
| 66 | Petya and Spiders | Codeforces | Codeforces Beta Round #85 (Div. 1 Only) & Codeforces Beta Round #85 (Div. 2 Only) | 7 | |
| 67 | Binary Table | Codeforces | CROC 2016 - Final Round [Private, For Onsite Finalists Only] | 7 | |
| 68 | Remembering Strings | Codeforces | Codeforces Round #302 (Div. 1) & Codeforces Round #302 (Div. 2) | 7 | |
| 69 | Fuzzy Search | Codeforces | Codeforces Round #296 (Div. 1) | 7 | |
| 70 | Guess the Tree | Codeforces | Codeforces Round #245 (Div. 1) & Codeforces Round #245 (Div. 2) | 7 | |
| 71 | Inna and Binary Logic | Codeforces | Codeforces Round #234 (Div. 2) | 7 | |
| 72 | Captains Mode | Codeforces | Codeforces Round #222 (Div. 1) & Codeforces Round #222 (Div. 2) | 7 | |
| 73 | Axis Walking | Codeforces | Codeforces Round #191 (Div. 2) | 7 | |
| 74 | Hongcow Buys a Deck of Cards | Codeforces | Codeforces Round #385 (Div. 1) & Codeforces Round #385 (Div. 2) | 7 | |
| 75 | Password | Codeforces | Codeforces Beta Round #71 | 8 | |
| 76 | Sweets Game | Codeforces | Codeforces Beta Round #59 (Div. 2) | 8 | |
| 77 | Dead Ends | Codeforces | Codeforces Beta Round #49 (Div. 2) | 8 | |
| 78 | Traveling Graph | Codeforces | Codeforces Alpha Round #21 (Codeforces format) | 8 | |
| 79 | Game with Strings | Codeforces | Codeforces Round #275 (Div. 1) & Codeforces Round #275 (Div. 2) | 8 | |
| 80 | Yash And Trees | Codeforces | Manthan, Codefest 16 | 8 | |
| 81 | 2048 | Codeforces | Coder-Strike 2014 - Round 2 | 8 | |
| 82 | Bear and Floodlight | Codeforces | Codeforces Round #226 (Div. 2) | 8 | |
| 83 | Sereja and Sets | Codeforces | Codeforces Round #215 (Div. 1) | 8 | |
| 84 | Bags and Coins | Codeforces | Codeforces Round #207 (Div. 1) | 8 | |
| 85 | Xenia and Dominoes | Codeforces | Codeforces Round #199 (Div. 2) | 8 | |
| 86 | Summer Earnings | Codeforces | Codeforces Round #194 (Div. 1) | 8 | |
| 87 | Memory for Arrays | Codeforces | Croc Champ 2013 - Finals (online version, Div. 1) | 8 | |
| 88 | The Minimum Number of Variables | Codeforces | Codeforces Round #171 (Div. 2) | 8 | |
| 89 | Two Sets | Codeforces | Codeforces Round #153 (Div. 1) | 9 | |
| 90 | Friends | Codeforces | Bayan 2012-2013 Elimination Round (ACM ICPC Rules, English statements) | 9 | |
| 91 | Quick Tortoise | Codeforces | Codeforces Round #144 (Div. 1) | 9 | |
| 92 | Bitonix' Patrol | Codeforces | Codeforces Round #134 (Div. 1) | 9 | |
| 93 | Polycarpus is Looking for Good Substrings | Codeforces | VK Cup 2012 Finals (unofficial online-version) | 9 | |
| 94 | Brand New Problem | Codeforces | Codeforces Round #127 (Div. 1) | 9 | |
| 95 | Garden | Codeforces | Codeforces Round #108 (Div. 2) | 9 | |
| 96 | Arrangement | Codeforces | Codeforces Beta Round #83 (Div. 1 Only) & Codeforces Beta Round #83 (Div. 2 Only) | 9 | |
| 97 | Two Subsequences | Codeforces | Codeforces Beta Round #72 (Div. 1 Only) | 9 | |
| 98 | Nuclear Fusion | Codeforces | Codeforces Beta Round #65 (Div. 2) | 9 | |
| 99 | Circling Round Treasures | Codeforces | Codeforces Round #221 (Div. 1) & Codeforces Round #221 (Div. 2) | 9 | |
| 100 | Gambling Nim | Codeforces | CROC 2016 - Final Round [Private, For Onsite Finalists Only] | 9 | |
| 101 | Sandy and Nuts | Codeforces | Codeforces Round #332 (Div. 2) | 9 | |
| 102 | Simplified Nonogram | Codeforces | Codeforces Round #298 (Div. 2) | 9 | |
| 103 | Misha and XOR | Codeforces | Codeforces Round #285 (Div. 1) | 9 | |
| 104 | Design Tutorial: Increase the Constraints | Codeforces | Codeforces Round #270 | 9 | |
| 105 | Valera and Number | Codeforces | Codeforces Round #252 (Div. 2) | 9 | |
| 106 | Game with Strings | Codeforces | Codeforces Round #206 (Div. 1) & Codeforces Round #206 (Div. 2) | 9 | |
| 107 | Dasha and cyclic table | Codeforces | Codeforces Round #390 (Div. 2) | 9 | |
| 108 | Robot in Basement | Codeforces | Yandex.Algorithm 2011 Finals | 10 | |
| 109 | Mutation | Codeforces | All-Ukrainian School Olympiad in Informatics | 10 | |
| 110 | Boolean Function | Codeforces | Codeforces Round #323 (Div. 1) | 10 | |
| 111 | Party | Codeforces | Bubble Cup 8 - Finals [Online Mirror] | 10 | |
| 112 | Restoring Map | Codeforces | VK Cup 2015 - Finals, online mirror | 10 | |
| 113 | Vasily the Bear and Painting Square | Codeforces | Codeforces Round #195 (Div. 2) | 10 |