| Problem Name | Online Judge | Year | Contest | Difficulty Level | |
|---|---|---|---|---|---|
| 1 | Prime Number Theorem | SPOJ | 1 | ||
| 2 | Divisors | SPOJ | 1 | ||
| 3 | Euler Totient Function | SPOJ | 1 | ||
| 4 | Factorial | SPOJ | 1 | ||
| 5 | Game of Lines | SPOJ | 1 | ||
| 6 | Marbles | SPOJ | 1 | ||
| 7 | The Moronic Cowmpouter | SPOJ | 1 | ||
| 8 | Prime or Not | SPOJ | 1 | ||
| 9 | Prime Generator | SPOJ | 1 | ||
| 10 | Two squares or not two squares | SPOJ | 1 | ||
| 11 | Divisor Summation | SPOJ | 1 | ||
| 12 | Integer Factorization (15 digits) | SPOJ | 1 | ||
| 13 | LCM Sum | SPOJ | 1 | ||
| 14 | GCD Extreme | SPOJ | 1 | ||
| 15 | T-primes | Codeforces | Codeforces Round #142 (Div. 2) | 1 | |
| 16 | Hexadecimal's theorem | Codeforces | Codeforces Round #125 (Div. 2) | 1 | |
| 17 | Lucky Division | Codeforces | Codeforces Beta Round #91 (Div. 2 Only) | 1 | |
| 18 | Panoramix's Prediction | Codeforces | Codeforces Beta Round #69 (Div. 2 Only) | 1 | |
| 19 | Almost Prime | Codeforces | Codeforces Beta Round #26 (Codeforces format) | 1 | |
| 20 | Medium Factorization | SPOJ | 1 | ||
| 21 | Cifera | Codeforces | Codeforces Beta Round #86 (Div. 2 Only) | 1 | |
| 22 | The Equation | SGU | 1 | ||
| 23 | Prime Cuts | UVA | 1 | ||
| 24 | Goldbach's Conjecture | UVA | 1 | ||
| 25 | Goldbach's Conjecture (II) | UVA | 1 | ||
| 26 | Simply Emirp | UVA | 1 | ||
| 27 | Twin Primes | UVA | 1 | ||
| 28 | Prime Words | UVA | 1 | ||
| 29 | The primary problem | UVA | 1 | ||
| 30 | Ones | UVA | 1 | ||
| 31 | Relatives | UVA | 1 | ||
| 32 | Graph Connectivity | UVA | 1 | ||
| 33 | Count the factors | TJU | 1 | ||
| 34 | Tip Top Game | SPOJ | 1 | ||
| 35 | Factovisors | UVA | 1 | ||
| 36 | Play with Floor and Ceil | UVA | 1 | ||
| 37 | Totient Extreme | SPOJ | 1 | ||
| 38 | Factors and Factorials | UVA | 1 | ||
| 39 | Fombinatorial | CodeChef | 1 | ||
| 40 | Celebrity jeopardy | UVA | 1 | ||
| 41 | Again Twenty Five! | Codeforces | Experimental Educational Round: VolBIT Formulas Blitz | 1 | |
| 42 | Multiplication Table | Codeforces | Codeforces Round #319 (Div. 2) | 1 | |
| 43 | Vasya and Petya's Game | Codeforces | Codeforces Round #319 (Div. 1) & Codeforces Round #319 (Div. 2) | 1 | |
| 44 | Bear and Poker | Codeforces | Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 1) & Codeforces Round #318 [RussianCodeCup Thanks-Round] (Div. 2) | 1 | |
| 45 | A and B and Team Training | Codeforces | Codeforces Round #294 (Div. 2) | 1 | |
| 46 | Design Tutorial: Learn from Math | Codeforces | Codeforces Round #270 | 1 | |
| 47 | Fedya and Maths | Codeforces | Codeforces Round #260 (Div. 2) | 1 | |
| 48 | Ilya and Bank Account | Codeforces | Codeforces Round #186 (Div. 2) | 1 | |
| 49 | Toy Army | Codeforces | Codeforces Beta Round #72 (Div. 2 Only) | 1 | |
| 50 | Alyona and Numbers | Codeforces | Codeforces Round #358 (Div. 2) | 1 | |
| 51 | Almost Prime Numbers | UVA | 1 | ||
| 52 | Bachgold Problem | Codeforces | Codeforces Round #388 (Div. 2) | 1 | |
| 53 | Arpa’s hard exam and Mehrdad’s naive cheat | Codeforces | Codeforces Round #383 (Div. 2) | 1 | |
| 54 | Factorial | Live Archive | 2000 | Europe - Central | 1 |
| 55 | String Task | Codeforces | Codeforces Beta Round #89 (Div. 2) | 1 | |
| 56 | The Bytelandian Cryptographer (Act I) | SPOJ | 2 | ||
| 57 | Sort fractions | SPOJ | 2 | ||
| 58 | Prime Again | SPOJ | 2 | ||
| 59 | Primitive Root | SPOJ | 2 | ||
| 60 | Divisor Summation (Hard) | SPOJ | 2 | ||
| 61 | Integer Factorization (20 digits) | SPOJ | 2 | ||
| 62 | Divisors 2 | SPOJ | 2 | ||
| 63 | N DIV PHI_N | SPOJ | 2 | ||
| 64 | Square-free integers | SPOJ | 2 | ||
| 65 | Playing with Marbles | SPOJ | 2 | ||
| 66 | Odd Numbers of Divisors | SPOJ | 2 | ||
| 67 | Equation | SPOJ | 2 | ||
| 68 | LCM Challenge | Codeforces | Codeforces Round #146 (Div. 1) & Codeforces Round #146 (Div. 2) | 2 | |
| 69 | Ice Sculptures | Codeforces | VK Cup 2012 Qualification Round 1 | 2 | |
| 70 | Jumping Champion | UVA | 2 | ||
| 71 | Goldbach and Euler | UVA | 2 | ||
| 72 | Marbles | UVA | 2 | ||
| 73 | Mint | UVA | 2 | ||
| 74 | Psycho | SPOJ | 2 | ||
| 75 | Minimum Number | SPOJ | 2 | ||
| 76 | Mr. Azad and his Son!!!!! | UVA | 2 | ||
| 77 | TEX Quotes | Live Archive | 1994 | North America - East Central NA | 2 |
| 78 | MCQ Exam | A2 Online Judge | 2 | ||
| 79 | Dima and Lisa | Codeforces | Codeforces Round #324 (Div. 2) | 2 | |
| 80 | Soldier and Number Game | Codeforces | Codeforces Round #304 (Div. 2) | 2 | |
| 81 | 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 | |
| 82 | Mashmokh and Numbers | Codeforces | Codeforces Round #240 (Div. 1) & Codeforces Round #240 (Div. 2) | 2 | |
| 83 | Alice and Bob | Codeforces | Codeforces Round #201 (Div. 1) & Codeforces Round #201 (Div. 2) | 2 | |
| 84 | Rational Resistance | Codeforces | Codeforces Round #200 (Div. 1) & Codeforces Round #200 (Div. 2) | 2 | |
| 85 | Prime Matrix | Codeforces | Codeforces Round #166 (Div. 2) | 2 | |
| 86 | k-th divisor | Codeforces | Educational Codeforces Round 17 | 2 | |
| 87 | Leha and Function | Codeforces | Codeforces Round #429 (Div. 1) & Codeforces Round #429 (Div. 2) | 2 | |
| 88 | Taxes | Codeforces | Codeforces Round #382 (Div. 2) & Codeforces Round #382 (Div. 1) | 2 | |
| 89 | Pride | Codeforces | Codeforces Round #446 (Div. 1) & Codeforces Round #446 (Div. 2) | 2 | |
| 90 | Vladik and fractions | Codeforces | Codeforces Round #384 (Div. 2) | 2 | |
| 91 | Pythagorean Triples | Codeforces | Codeforces Round #368 (Div. 2) | 2 | |
| 92 | Arpa’s obvious problem and Mehrdad’s terrible solution | Codeforces | Codeforces Round #383 (Div. 2) | 2 | |
| 93 | Number Theory for Newbies | UVA | 2 | ||
| 94 | Anagrammatic Primes | UVA | 2 | ||
| 95 | GCD Determinant | SPOJ | 3 | ||
| 96 | Skyscraper Floors | SPOJ | 3 | ||
| 97 | Homework | SPOJ | 3 | ||
| 98 | Congruence Equation | SPOJ | 3 | ||
| 99 | Sky Code | SPOJ | 3 | ||
| 100 | Binomial Coefficients | SPOJ | 3 | ||
| 101 | Primes on Interval | Codeforces | Codeforces Round #147 (Div. 2) | 3 | |
| 102 | Easy Number Challenge | Codeforces | Codeforces Round #146 (Div. 2) | 3 | |
| 103 | Little Elephant and Numbers | Codeforces | Codeforces Round #136 (Div. 2) | 3 | |
| 104 | Win or Freeze | Codeforces | Codeforces Round #107 (Div. 1) & Codeforces Round #107 (Div. 2) | 3 | |
| 105 | Modified GCD | Codeforces | Codeforces Beta Round #67 (Div. 2) | 3 | |
| 106 | Noldbach problem | Codeforces | Codeforces Beta Round #17 | 3 | |
| 107 | Chef and Functions | CodeChef | 3 | ||
| 108 | Cows and Primitive Roots | Codeforces | Codeforces Round #174 (Div. 2) | 3 | |
| 109 | DDF | UVA | 3 | ||
| 110 | A Trivial Problem | Codeforces | Manthan, Codefest 16 | 3 | |
| 111 | Primes or Palindromes? | Codeforces | Codeforces Round #315 (Div. 1) & Codeforces Round #315 (Div. 2) | 3 | |
| 112 | Bear and Prime Numbers | Codeforces | Codeforces Round #226 (Div. 2) | 3 | |
| 113 | Fox Dividing Cheese | Codeforces | Codeforces Round #218 (Div. 2) | 3 | |
| 114 | Levko and Permutation | Codeforces | Codeforces Round #210 (Div. 2) | 3 | |
| 115 | Quiz | Codeforces | Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1) | 3 | |
| 116 | Routine Problem | Codeforces | Codeforces Round #196 (Div. 2) | 3 | |
| 117 | Good Sequences | Codeforces | Codeforces Round #162 (Div. 1) & Codeforces Round #162 (Div. 2) | 3 | |
| 118 | Permutation Primes | Live Archive | 2004 | Asia - Dhaka | 3 |
| 119 | Primal Fear | SPOJ | 3 | ||
| 120 | The Meaningless Game | Codeforces | Codeforces Round #426 (Div. 1) & Codeforces Round #426 (Div. 2) | 3 | |
| 121 | Mike and gcd problem | Codeforces | Codeforces Round #410 (Div. 2) | 3 | |
| 122 | Eugeny and Play List | Codeforces | Codeforces Round #182 (Div. 2) | 3 | |
| 123 | The Super Powers | UVA | 3 | ||
| 124 | SETI | SPOJ | 4 | ||
| 125 | Rank of a Fraction | SPOJ | 4 | ||
| 126 | N DIV PHI_N (Hard) | SPOJ | 4 | ||
| 127 | Chilly Willy | Codeforces | Codeforces Round #152 (Div. 2) | 4 | |
| 128 | Well-known Numbers | Codeforces | Codeforces Round #139 (Div. 2) | 4 | |
| 129 | Colliders | Codeforces | Codeforces Round #109 (Div. 1) & Codeforces Round #109 (Div. 2) | 4 | |
| 130 | Petya and Divisors | Codeforces | Codeforces Beta Round #85 (Div. 1 Only) & Codeforces Beta Round #85 (Div. 2 Only) | 4 | |
| 131 | Round Table Knights | Codeforces | Codeforces Beta Round #65 (Div. 2) | 4 | |
| 132 | Irrational problem | Codeforces | Codeforces Beta Round #62 | 4 | |
| 133 | Fortune Telling | Codeforces | Codeforces Beta Round #55 (Div. 2) | 4 | |
| 134 | Dots | SPOJ | 4 | ||
| 135 | Skyscraper Floors | UVA | 4 | ||
| 136 | Boring Card Game | Live Archive | 2011 | Europe - Central | 4 |
| 137 | Gaussian Prime Factors | Live Archive | 2006 | Asia - Manila | 4 |
| 138 | Broken Keyboard | UVA | 4 | ||
| 139 | Subtraction | A2 Online Judge | 4 | ||
| 140 | Multipliers | Codeforces | Codeforces Round #338 (Div. 2) | 4 | |
| 141 | Gerald and Giant Chess | Codeforces | Codeforces Round #313 (Div. 1) & Codeforces Round #313 (Div. 2) | 4 | |
| 142 | Ant colony | Codeforces | Codeforces Round #271 (Div. 2) | 4 | |
| 143 | Devu and Partitioning of the Array | Codeforces | Codeforces Round #251 (Div. 2) | 4 | |
| 144 | Divisible by Seven | Codeforces | Codeforces Round #221 (Div. 1) & Codeforces Round #221 (Div. 2) | 4 | |
| 145 | Find Maximum | Codeforces | Codeforces Round #205 (Div. 2) | 4 | |
| 146 | Ksusha and Array | Codeforces | Croc Champ 2013 - Round 2 (Div. 2 Edition) | 4 | |
| 147 | Subtractions | Codeforces | Codeforces Testing Round #5 | 4 | |
| 148 | Fox And Jumping | Codeforces | Codeforces Round #290 (Div. 2) & Codeforces Round #290 (Div. 1) | 4 | |
| 149 | Remainders Game | Codeforces | Codeforces Round #360 (Div. 1) & Codeforces Round #360 (Div. 2) | 4 | |
| 150 | Ralph And His Magic Field | Codeforces | Codeforces Round #447 (Div. 2) | 4 | |
| 151 | The Most Complex Number | Timus | 4 | ||
| 152 | Rectangular Game | Codeforces | ABBYY Cup 2.0 - Easy | 5 | |
| 153 | Rectangular Game | Codeforces | ABBYY Cup 2.0 - Easy | 5 | |
| 154 | Pseudorandom Sequence Period | Codeforces | Croc Champ 2012 - Qualification Round | 5 | |
| 155 | Prime Permutation | Codeforces | Codeforces Beta Round #92 (Div. 1 Only) & Codeforces Beta Round #92 (Div. 2 Only) | 5 | |
| 156 | Petya and His Friends | Codeforces | Codeforces Beta Round #61 (Div. 2) | 5 | |
| 157 | Number With The Given Amount Of Divisors | Codeforces | Codeforces Beta Round #27 (Codeforces format, Div. 2) | 5 | |
| 158 | Monitor | Codeforces | Codeforces Beta Round #16 (Div. 2 Only) | 5 | |
| 159 | Line | Codeforces | Codeforces Beta Round #7 | 5 | |
| 160 | Moodular Arithmetic | Codeforces | Codeforces Round #334 (Div. 1) & Codeforces Round #334 (Div. 2) | 5 | |
| 161 | Clique in the Divisibility Graph | Codeforces | VK Cup 2015 - Finals, online mirror | 5 | |
| 162 | Mike and Foam | Codeforces | Codeforces Round #305 (Div. 1) & Codeforces Round #305 (Div. 2) | 5 | |
| 163 | Array and Operations | Codeforces | Codeforces Round #284 (Div. 1) & Codeforces Round #284 (Div. 2) | 5 | |
| 164 | Chocolate | Codeforces | Codeforces Round #279 (Div. 2) | 5 | |
| 165 | Roman and Numbers | Codeforces | Codeforces Round #235 (Div. 2) | 5 | |
| 166 | Vasya and Beautiful Arrays | Codeforces | Codeforces Round #206 (Div. 1) & Codeforces Round #206 (Div. 2) | 5 | |
| 167 | Vasily the Bear and Sequence | Codeforces | Codeforces Round #195 (Div. 2) | 5 | |
| 168 | Shaass and Lights | Codeforces | Codeforces Round #178 (Div. 2) | 5 | |
| 169 | Upgrading Array | Codeforces | Codeforces Round #236 (Div. 2) & Codeforces Round #236 (Div. 1) | 5 | |
| 170 | Tutorial BFS | SPOJ | 5 | ||
| 171 | Winter is here | Codeforces | Codeforces Round #428 (Div. 2) | 5 | |
| 172 | Anton and School - 2 | Codeforces | Codeforces Round #404 (Div. 2) | 5 | |
| 173 | Palindrome Degree | Codeforces | Codeforces Beta Round #7 | 5 | |
| 174 | Polygon Encoder | SPOJ | 6 | ||
| 175 | Printing some primes (Hard) | SPOJ | 6 | ||
| 176 | Reducing Fractions | Codeforces | Codeforces Round #137 (Div. 2) | 6 | |
| 177 | Calendar Reform | Codeforces | Croc Champ 2012 - Qualification Round | 6 | |
| 178 | Very Interesting Game | Codeforces | Codeforces Beta Round #88 | 6 | |
| 179 | Beaver Game | Codeforces | Codeforces Beta Round #70 (Div. 2) | 6 | |
| 180 | Longest Subsequence | Codeforces | Educational Codeforces Round 9 | 6 | |
| 181 | Array GCD | Codeforces | AIM Tech Round (Div. 1) & AIM Tech Round (Div. 2) | 6 | |
| 182 | Bots | Codeforces | Bubble Cup 8 - Finals [Online Mirror] | 6 | |
| 183 | GukiZ and Binary Operations | Codeforces | Codeforces Round #307 (Div. 2) | 6 | |
| 184 | Pluses everywhere | Codeforces | Codeforces Round #295 (Div. 2) & Codeforces Round #295 (Div. 1) | 6 | |
| 185 | Prefix Product Sequence | Codeforces | Codeforces Round #278 (Div. 1) & Codeforces Round #278 (Div. 2) | 6 | |
| 186 | Devu and Flowers | Codeforces | Codeforces Round #258 (Div. 2) | 6 | |
| 187 | Jzzhu and Apples | Codeforces | Codeforces Round #257 (Div. 1) & Codeforces Round #257 (Div. 2) | 6 | |
| 188 | Divisors | Codeforces | Codeforces Round #256 (Div. 2) | 6 | |
| 189 | DZY Loves Fibonacci Numbers | Codeforces | Codeforces Round #255 (Div. 1) & Codeforces Round #255 (Div. 2) | 6 | |
| 190 | Apple Tree | Codeforces | Codeforces Round #202 (Div. 1) & Codeforces Round #202 (Div. 2) | 6 | |
| 191 | Lucky Permutation | Codeforces | Codeforces Beta Round #91 (Div. 1 Only) & Codeforces Beta Round #91 (Div. 2 Only) | 6 | |
| 192 | Beautiful numbers | Codeforces | Codeforces Beta Round #51 | 6 | |
| 193 | Goldbach++ | Live Archive | 2005 | North America - Southeast USA | 6 |
| 194 | Unusual Sequences | Codeforces | Codeforces Round #450 (Div. 2) | 6 | |
| 195 | ZS and The Birthday Paradox | Codeforces | Codeforces Round #369 (Div. 2) | 6 | |
| 196 | Integer Factorization (29 digits) | SPOJ | 7 | ||
| 197 | Finding the Kth Prime (Hard) | SPOJ | 7 | ||
| 198 | Number Transformation | Codeforces | Codeforces Round #153 (Div. 1) & Codeforces Round #153 (Div. 2) | 7 | |
| 199 | Pairs of Numbers | Codeforces | Codeforces Testing Round #3 | 7 | |
| 200 | Double Happiness | Codeforces | Codeforces Beta Round #86 (Div. 1 Only) & Codeforces Beta Round #86 (Div. 2 Only) | 7 | |
| 201 | Chessboard Billiard | Codeforces | Codeforces Beta Round #68 | 7 | |
| 202 | Digital Root | Codeforces | Codeforces Beta Round #10 | 7 | |
| 203 | Sum of Remainders | Codeforces | Educational Codeforces Round 5 | 7 | |
| 204 | Alice, Bob, Oranges and Apples | Codeforces | Codeforces Round #325 (Div. 1) & Codeforces Round #325 (Div. 2) | 7 | |
| 205 | Traffic Jams in the Land | Codeforces | Codeforces Round #284 (Div. 1) | 7 | |
| 206 | On Sum of Fractions | Codeforces | Codeforces Round #232 (Div. 1) & Codeforces Round #232 (Div. 2) | 7 | |
| 207 | On Number of Decompositions into Multipliers | Codeforces | Codeforces Round #232 (Div. 1) & Codeforces Round #232 (Div. 2) | 7 | |
| 208 | Divisor Tree | Codeforces | Codeforces Round #196 (Div. 2) & Codeforces Round #196 (Div. 1) | 7 | |
| 209 | ucyhf | Codeforces | April Fools Day Contest | 7 | |
| 210 | 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 | |
| 211 | Fractions | UVA | 8 | ||
| 212 | Number Challenge | Codeforces | Codeforces Round #146 (Div. 1) | 8 | |
| 213 | Anniversary | Codeforces | Codeforces Round #140 (Div. 1) & Codeforces Round #140 (Div. 2) | 8 | |
| 214 | Unsolvable | Codeforces | Codeforces Round #139 (Div. 2) | 8 | |
| 215 | Martian Luck | Codeforces | Codeforces Round #133 (Div. 2) | 8 | |
| 216 | Periodical Numbers | Codeforces | Codeforces Round #132 (Div. 2) | 8 | |
| 217 | Numbers | Codeforces | Codeforces Beta Round #72 (Div. 1 Only) | 8 | |
| 218 | Prime Problem | Codeforces | School Team Contest #3 (Winter Computer School 2010/11) | 8 | |
| 219 | Notepad | Codeforces | Codeforces Beta Round #17 | 8 | |
| 220 | Cowslip Collections | Codeforces | CROC 2016 - Elimination Round | 8 | |
| 221 | REQ | Codeforces | Codeforces Round #330 (Div. 1) | 8 | |
| 222 | Superior Periodic Subarrays | Codeforces | Codeforces Round #323 (Div. 1) & Codeforces Round #323 (Div. 2) | 8 | |
| 223 | The Child and Binary Tree | Codeforces | Codeforces Round #250 (Div. 1) | 8 | |
| 224 | Beautiful Set | Codeforces | Codeforces Round #213 (Div. 1) & Codeforces Round #213 (Div. 2) | 8 | |
| 225 | GCD Table | Codeforces | Codeforces Round #196 (Div. 1) | 8 | |
| 226 | Cube Problem | Codeforces | Croc Champ 2013 - Round 2 | 8 | |
| 227 | Cows and Cool Sequences | Codeforces | Codeforces Round #174 (Div. 1) | 8 | |
| 228 | Three Horses | Codeforces | Codeforces Round #166 (Div. 2) | 8 | |
| 229 | Ultimate Weirdness of an Array | Codeforces | Codeforces Round #352 (Div. 1) & Codeforces Round #352 (Div. 2) | 8 | |
| 230 | Timofey and remoduling | Codeforces | Codeforces Round #395 (Div. 1) & Codeforces Round #395 (Div. 2) | 8 | |
| 231 | Mishka and Divisors | Codeforces | Codeforces Round #365 (Div. 2) | 8 | |
| 232 | Ada and Connections | SPOJ | 8 | ||
| 233 | Tractor College | Codeforces | Codeforces Round #126 (Div. 2) | 9 | |
| 234 | Visit of the Great | Codeforces | Codeforces Round #118 (Div. 1) | 9 | |
| 235 | Divisibility Rules | Codeforces | Codeforces Round #116 (Div. 2, ACM-ICPC Rules) | 9 | |
| 236 | Morrowindows | Codeforces | Codeforces Beta Round #66 | 9 | |
| 237 | Swap (Easy - Level 2) | SPOJ | 9 | ||
| 238 | Four Divisors | Codeforces | Educational Codeforces Round 12 | 9 | |
| 239 | Present for Vitalik the Philatelist | Codeforces | Codeforces Round #325 (Div. 1) | 9 | |
| 240 | Superhero's Job | Codeforces | VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) | 9 | |
| 241 | Levko and Sets | Codeforces | Codeforces Round #210 (Div. 1) | 9 | |
| 242 | White, Black and White Again | Codeforces | Testing Round #6 | 9 | |
| 243 | Rotatable Number | Codeforces | Codeforces Round #183 (Div. 1) | 9 | |
| 244 | Shaass and Painter Robot | Codeforces | Codeforces Round #178 (Div. 2) | 9 | |
| 245 | Prime factorization | Codeforces | VK Cup 2012 Wild-card Round 1 | 10 | |
| 246 | Number of Binominal Coefficients | Codeforces | Codeforces Round #323 (Div. 1) | 10 | |
| 247 | New Year Running | Codeforces | Good Bye 2014 | 10 | |
| 248 | Jzzhu and Squares | Codeforces | Codeforces Round #257 (Div. 1) | 10 | |
| 249 | Mister B and Beacons on Field | Codeforces | Codeforces Round #421 (Div. 1) & Codeforces Round #421 (Div. 2) | 10 | |
| 250 | Mister B and Astronomers | Codeforces | Codeforces Round #421 (Div. 1) | 10 | |
| 251 | Nephren Runs a Cinema | Codeforces | Codeforces Round #449 (Div. 1) | 10 |