| Problem Name | Online Judge | Contest | Difficulty Level | |
|---|---|---|---|---|
| 1 | Roommate Agreement | SPOJ | 1 | |
| 2 | Queries about less or equal elements | Codeforces | Educational Codeforces Round 2 | 1 |
| 3 | Kefa and Company | Codeforces | Codeforces Round #321 (Div. 2) | 1 |
| 4 | BerSU Ball | Codeforces | Codeforces Round #277.5 (Div. 2) | 1 |
| 5 | Number of Ways | Codeforces | Codeforces Round #266 (Div. 2) | 1 |
| 6 | Sereja and Dima | Codeforces | Codeforces Round #223 (Div. 2) | 1 |
| 7 | Books | Codeforces | Codeforces Round #171 (Div. 2) | 1 |
| 8 | Complete the Word | Codeforces | Codeforces Round #372 (Div. 2) | 1 |
| 9 | Points on Line | Codeforces | Codeforces Round #153 (Div. 1) & Codeforces Round #153 (Div. 2) | 2 |
| 10 | Another Problem on Strings | Codeforces | Codeforces Round #112 (Div. 2) | 2 |
| 11 | Alice, Bob and Chocolate | Codeforces | Codeforces Beta Round #6 (Div. 2 Only) | 2 |
| 12 | Audition | SPOJ | 2 | |
| 13 | Approximating a Constant Range | Codeforces | Codeforces Round #333 (Div. 2) | 2 |
| 14 | Modulo Sum | Codeforces | Codeforces Round #319 (Div. 2) | 2 |
| 15 | DZY Loves Sequences | Codeforces | Codeforces Round #255 (Div. 1) & Codeforces Round #255 (Div. 2) | 2 |
| 16 | Checkposts | Codeforces | Codeforces Round #244 (Div. 2) | 2 |
| 17 | George and Round | Codeforces | Codeforces Round #227 (Div. 2) | 2 |
| 18 | Counting Kangaroos is Fun | Codeforces | Codeforces Round #219 (Div. 1) & Codeforces Round #219 (Div. 2) | 2 |
| 19 | Strings of Power | Codeforces | Codeforces Round #188 (Div. 2) | 2 |
| 20 | Escape from Stones | Codeforces | Codeforces Round #162 (Div. 1) & Codeforces Round #162 (Div. 2) | 2 |
| 21 | Vasya and String | Codeforces | Codeforces Round #354 (Div. 2) | 2 |
| 22 | Wrath | Codeforces | Codeforces Round #446 (Div. 2) | 2 |
| 23 | Kirill And The Game | Codeforces | Codeforces Round #430 (Div. 2) | 2 |
| 24 | Physics Practical | Codeforces | Codeforces Round #154 (Div. 2) | 3 |
| 25 | To Add or Not to Add | Codeforces | Codeforces Round #143 (Div. 2) | 3 |
| 26 | Array | Codeforces | Codeforces Round #138 (Div. 2) | 3 |
| 27 | Dress'em in Vests! | Codeforces | VK Cup 2012 Round 1 | 3 |
| 28 | Stripe | Codeforces | Codeforces Beta Round #18 (Div. 2 Only) | 3 |
| 29 | Hard Process | Codeforces | Educational Codeforces Round 11 | 3 |
| 30 | A and B and Interesting Substrings | Codeforces | Codeforces Round #294 (Div. 2) | 3 |
| 31 | Mr. Kitayuta, the Treasure Hunter | Codeforces | Codeforces Round #286 (Div. 2) & Codeforces Round #286 (Div. 1) | 3 |
| 32 | Vasya and Basketball | Codeforces | Codeforces Round #281 (Div. 2) | 3 |
| 33 | Maximum Value | Codeforces | Codeforces Round #276 (Div. 1) & Codeforces Round #276 (Div. 2) | 3 |
| 34 | Guess a number! | Codeforces | Codeforces Round #241 (Div. 2) | 3 |
| 35 | Eugeny and Play List | Codeforces | Codeforces Round #182 (Div. 2) | 3 |
| 36 | Ladder | Codeforces | Codeforces Round #171 (Div. 2) | 3 |
| 37 | Primes on Interval | Codeforces | Codeforces Round #147 (Div. 2) | 3 |
| 38 | Powerful array | Codeforces | Yandex.Algorithm 2011 Round 2 | 3 |
| 39 | Alyona and Spreadsheet | Codeforces | Codeforces Round #401 (Div. 2) | 3 |
| 40 | An impassioned circulation of affection | Codeforces | Codeforces Round #418 (Div. 2) | 3 |
| 41 | Voting | Codeforces | Codeforces Round #388 (Div. 2) | 3 |
| 42 | Shifts | Codeforces | Codeforces Round #142 (Div. 1) & Codeforces Round #142 (Div. 2) | 4 |
| 43 | Where Are My Flakes? | Codeforces | Codeforces Beta Round #56 | 4 |
| 44 | Image Preview | Codeforces | Codeforces Round #345 (Div. 1) & Codeforces Round #345 (Div. 2) | 4 |
| 45 | Processing Queries | Codeforces | CROC 2016 - Qualification | 4 |
| 46 | Longest k-Good Segment | Codeforces | Educational Codeforces Round 5 | 4 |
| 47 | Devu and his Brother | Codeforces | Codeforces Round #251 (Div. 2) | 4 |
| 48 | Prefixes and Suffixes | Codeforces | Codeforces Round #246 (Div. 2) | 4 |
| 49 | Balls Game | Codeforces | Codeforces Round #245 (Div. 2) | 4 |
| 50 | Multitasking | Codeforces | Codeforces Round #225 (Div. 2) | 4 |
| 51 | Pair of Numbers | Codeforces | Codeforces Round #209 (Div. 2) | 4 |
| 52 | Almost Arithmetical Progression | Codeforces | Codeforces Round #156 (Div. 2) & Codeforces Round #156 (Div. 1) | 4 |
| 53 | Pointers | SGU | 4 | |
| 54 | XK Segments | Codeforces | Codeforces Round #448 (Div. 2) | 4 |
| 55 | Olympiad | Codeforces | Codeforces Round #137 (Div. 2) | 5 |
| 56 | Two Paths | Codeforces | Codeforces Beta Round #14 (Div. 2) | 5 |
| 57 | Exposition | Codeforces | Codeforces Beta Round #6 (Div. 2 Only) | 5 |
| 58 | Foe Pairs | Codeforces | Educational Codeforces Round 10 | 5 |
| 59 | Enduring Exodus | Codeforces | CROC 2016 - Elimination Round | 5 |
| 60 | Skills | Codeforces | Codeforces Round #339 (Div. 1) & Codeforces Round #339 (Div. 2) | 5 |
| 61 | Correcting Mistakes | Codeforces | VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) | 5 |
| 62 | R2D2 and Droid Army | Codeforces | Codeforces Round #291 (Div. 2) | 5 |
| 63 | Strip | Codeforces | Codeforces Round #278 (Div. 1) & Codeforces Round #278 (Div. 2) | 5 |
| 64 | Read Time | Codeforces | Codeforces Round #200 (Div. 1) & Codeforces Round #200 (Div. 2) | 5 |
| 65 | Nearest Fraction | Codeforces | Codeforces Round #172 (Div. 2) | 5 |
| 66 | Maximum Xor Secondary | Codeforces | Codeforces Round #172 (Div. 1) & Codeforces Round #172 (Div. 2) | 5 |
| 67 | Jury Meeting | Codeforces | Codeforces Round #433 (Div. 1, based on Olympiad of Metropolises) & Codeforces Round #433 (Div. 2, based on Olympiad of Metropolises) | 5 |
| 68 | The Bakery | Codeforces | Codeforces Round #426 (Div. 1) & Codeforces Round #426 (Div. 2) | 5 |
| 69 | Cartons of milk | Codeforces | Codeforces Round #398 (Div. 2) | 5 |
| 70 | Towers | Codeforces | Codeforces Round #142 (Div. 1) | 6 |
| 71 | Non-Secret Cypher | Codeforces | Codeforces Round #120 (Div. 2) | 6 |
| 72 | Beaver | Codeforces | Codeforces Beta Round #71 | 6 |
| 73 | Hamsters and Tigers | Codeforces | School Personal Contest #2 (Winter Computer School 2010/11) - Codeforces Beta Round #43 (ACM-ICPC Rules) | 6 |
| 74 | Gadgets for dollars and pounds | Codeforces | Educational Codeforces Round 3 | 6 |
| 75 | Segment Tree | SPOJ | 6 | |
| 76 | Rooter's Song | Codeforces | Codeforces Round #431 (Div. 1) & Codeforces Round #431 (Div. 2) | 6 |
| 77 | Table with Letters - 2 | Codeforces | Codeforces Round #154 (Div. 2) | 7 |
| 78 | Little Elephant and Inversions | Codeforces | Codeforces Round #136 (Div. 1) | 7 |
| 79 | Spider's Web | Codeforces | Codeforces Round #133 (Div. 2) | 7 |
| 80 | Ski Base | Codeforces | Codeforces Beta Round #75 (Div. 1 Only) & Codeforces Beta Round #75 (Div. 2 Only) | 7 |
| 81 | Professor GukiZ and Two Arrays | Codeforces | Educational Codeforces Round 6 | 7 |
| 82 | Vika and Segments | Codeforces | Codeforces Round #337 (Div. 2) | 7 |
| 83 | Edo and Magnets | Codeforces | Codeforces Round #330 (Div. 1) & Codeforces Round #330 (Div. 2) | 7 |
| 84 | Social Network | Codeforces | VK Cup 2015 - Round 1 | 7 |
| 85 | Name That Tune | Codeforces | Codeforces Round #284 (Div. 1) & Codeforces Round #284 (Div. 2) | 7 |
| 86 | Bug in Code | Codeforces | Coder-Strike 2014 - Finals (online edition, Div. 2) & Coder-Strike 2014 - Finals (online edition, Div. 1) & Coder-Strike 2014 - Finals (online edition, Div. 2) & Coder-Strike 2014 - Finals (online edition, Div. 1) | 7 |
| 87 | Genetic Engineering | Codeforces | Rockethon 2014 | 7 |
| 88 | Subway Innovation | Codeforces | Codeforces Round #218 (Div. 2) | 7 |
| 89 | Dima and Trap Graph | Codeforces | Codeforces Round #214 (Div. 2) | 7 |
| 90 | Building Bridge | Codeforces | CROC-MBTU 2012, Final Round (Online version, Div. 2) | 7 |
| 91 | Cubes | Codeforces | Codeforces Round #116 (Div. 2, ACM-ICPC Rules) | 7 |
| 92 | Nanami's Digital Board | Codeforces | Codeforces Round #248 (Div. 2) & Codeforces Round #248 (Div. 1) | 7 |
| 93 | 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 |
| 94 | Mad Joe | Codeforces | CROC-MBTU 2012, Final Round (Online version, Div. 2) | 8 |
| 95 | Little Elephant and Strings | Codeforces | Codeforces Round #129 (Div. 1) | 8 |
| 96 | Ancient Berland Hieroglyphs | Codeforces | VK Cup 2012 Round 3 | 8 |
| 97 | Present to Mom | Codeforces | Codeforces Beta Round #95 (Div. 2) | 8 |
| 98 | Lucky Tickets | Codeforces | Codeforces Beta Round #64 | 8 |
| 99 | Very simple problem | Codeforces | Codeforces Beta Round #51 | 8 |
| 100 | Startup Funding | Codeforces | Manthan, Codefest 16 | 8 |
| 101 | Double Knapsack | Codeforces | Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) | 8 |
| 102 | Zublicanes and Mumocrates | Codeforces | Codeforces Round #322 (Div. 2) | 8 |
| 103 | Drazil and Morning Exercise | Codeforces | Codeforces Round #292 (Div. 1) | 8 |
| 104 | DZY Loves Strings | Codeforces | Codeforces Round #254 (Div. 1) | 8 |
| 105 | Mashmokh and Water Tanks | Codeforces | Codeforces Round #240 (Div. 1) | 8 |
| 106 | Diverse Substrings | Codeforces | Testing Round #9 | 8 |
| 107 | Volcanoes | Codeforces | Codeforces Round #225 (Div. 1) & Codeforces Round #225 (Div. 2) | 8 |
| 108 | Choosing Subtree is Fun | Codeforces | Codeforces Round #219 (Div. 1) | 8 |
| 109 | Sereja and Straight Lines | Codeforces | Codeforces Round #187 (Div. 1) | 8 |
| 110 | Morning run | Codeforces | Croc Champ 2013 - Finals (online version, Div. 1) | 8 |
| 111 | Alyona and Triangles | Codeforces | Codeforces Round #358 (Div. 2) | 8 |
| 112 | Shoe Store | Codeforces | Codeforces Round #113 (Div. 2) | 9 |
| 113 | Lucky Segments | Codeforces | Codeforces Beta Round #91 (Div. 1 Only) | 9 |
| 114 | Archer's Shot | Codeforces | Codeforces Beta Round #70 (Div. 2) | 9 |
| 115 | Mice | Codeforces | All-Ukrainian School Olympiad in Informatics | 9 |
| 116 | Race | Codeforces | Codeforces Beta Round #42 (Div. 2) | 9 |
| 117 | Context Advertising | Codeforces | Croc Champ 2013 - Finals (online version, Div. 1) | 9 |
| 118 | Ksusha and Square | Codeforces | Croc Champ 2013 - Round 2 | 9 |
| 119 | Colorful Stones | Codeforces | Codeforces Round #162 (Div. 1) | 9 |
| 120 | Maxim and Calculator | Codeforces | Codeforces Round #160 (Div. 1) | 9 |
| 121 | Transportation | Codeforces | Codeforces Round #128 (Div. 2) | 9 |
| 122 | Cubes | Codeforces | Codeforces Round #150 (Div. 1) | 10 |
| 123 | Hellish Constraints | Codeforces | Codeforces Beta Round #99 (Div. 1) | 10 |
| 124 | Orchestra | Codeforces | 8VC Venture Cup 2016 - Final Round | 10 |
| 125 | New Year and Cake | Codeforces | Good Bye 2015 | 10 |
| 126 | BCPC | Codeforces | Codeforces Round #328 (Div. 2) | 10 |
| 127 | Empty Rectangles | Codeforces | Codeforces Round #213 (Div. 1) | 10 |
| 128 | Galaxy Union | Codeforces | School Personal Contest #3 (Winter Computer School 2010/11) - Codeforces Beta Round #45 (ACM-ICPC Rules) | 10 |