6 Another Euler Brick in the Wall 2014-08-26T16:52:24.467

6 Compute 30000 Digits of Pi (π), as Fast as Possible 2015-06-12T14:47:37.260

6 Covering Array Validator 2015-06-21T22:19:02.950

6 Find the longest path, avoiding obstacles in a 2D plane 2016-03-12T14:07:00.113

6 Help the poor Cryptographers - DLP Edition 2016-07-22T19:58:01.323

6 Primitive roots density of number 2017-09-29T06:59:57.283

6 Check if all vowels exist in pairs of strings 2019-03-04T07:57:26.180

5 Carmichael Numbers 2011-02-12T17:38:30.187

5 Solve the Magic Hexagon 2012-06-10T10:30:53.640

5 Fastest modular exponentiation 2013-10-04T15:45:49.203

5 Analysing the most common words in a text, and replacing them with a single byte 2014-02-18T21:09:47.877

5 Coding a recursive function for highest possible input 2014-12-07T14:28:11.360

5 Fastest array-by-array nearest neighbour search 2015-02-12T07:19:51.487

5 Find arrays with distinct subarray sums 2018-11-08T19:48:53.803

5 Fastest way to iterate over sublattice of discrete lattice 2019-06-20T13:25:38.357

5 Find minimal set of rows to retain all unique values in each column 2019-09-10T19:00:03.587

4 List ALL prime-factorized natural numbers in ANY order 2012-09-07T12:50:07.837

4 Secret Santa Challenge 2012-11-26T18:27:54.083

4 Longest mathematical expression in a grid 2014-06-25T15:13:35.990

3 Reproportioning a population by adding fixed sized groups 2016-03-03T17:58:37.827

3 remove duplicates from array 2017-07-15T17:51:35.440

3 Multiplication in Brainfuck - minimum number of evaluations 2019-07-09T12:36:20.560

2 Fastest C/C++ comparison function for an opaque field containing doubles 2011-11-11T20:43:44.517

2 position of the only 1 in a number in binary format 2011-12-04T16:05:35.923

2 compute number of 1 bits in a binary representation of a number 2012-01-09T23:03:00.643

2 given prime factors of a number, what is the fastest way to calculate it's proper divisors? 2012-09-27T17:29:36.417

2 Merging text files based on a prefix key 2014-03-07T14:54:02.020

2 Find nth root of variable without using math operators/functions 2014-06-15T22:19:39.360

2 Write program which finds shortest expression for number 2014-07-22T18:41:06.293

2 The fastest square root calculator 2016-07-17T11:27:41.717

2 Tips for Fastest Code challenges 2017-06-19T05:28:15.623

1 Race to a Million 2013-01-16T05:29:24.603

1 Creating a catalogue index 2014-01-02T15:10:50.060

1 Chotchkies Restaurant 2014-10-04T22:47:48.960

1 Searching for a sum 2015-05-16T12:27:41.920

1 Generalization of Eight Queen Puzzle 2017-02-13T17:08:36.153

0 Find the fastest swim relay (shortest path of unique nodes and types) 2014-06-23T08:14:40.430

0 Fastest algorithm to output array containing all integers in range excluding duplicate digits 2018-11-03T21:11:32.923

-1 Symbol Search Deleter [rephrased] 2019-11-10T03:50:15.410

-3 Triangle Puzzle 2012-07-15T13:42:35.057

-4 Magical Squares 2014-11-23T02:52:15.293

-5 Solve the Diophantine Pell equation 2015-06-26T12:15:26.817

-5 Google search result short summary 2017-02-23T12:18:24.390

-5 Fastest N times Hello World (Java/C/ C++) 2019-11-07T11:29:08.347

-7 write a code the find n-th number of Gray Code list 2011-12-04T16:14:18.590