RogerBW's Blog

I’ve been doing the Weekly Challenges. The latest involved tree searches. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list searches and permutations. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved checking dominoes and doing some floating-point operations. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved fiddling with arrays and searching game states. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list evaluation and poker hands. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list analysis and Luhn's checksum algorithm. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list evaluation and string manipulation. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved palindromic numbers and block searches. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved password analysis and number parsing. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved quinelikes and list processing. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved network analysis and change calculation. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved a list search and an unusual sort. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list counting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved string-searching integers and bouncing around a keyboard. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved chess-related problems. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved character repetition and a basic string parse. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved more string manipulations. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved decoding a string format and partially sorting characters. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved word hunting and integer combinations. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved combinations and counting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved various flavours of string processing. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved string tweaking and bus route analysis. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved poking through strings. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved string replacement and character searching. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved matrix analysis, bit-counting and sorting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved searching matrices and raising array elements. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved sequence testing and splitting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list comparisons and rearangements. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved series multiplication and text fitting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved word list comparison and matrix validation. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved hunting integers and filtering words. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved letter hunting and array construction. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list and hash hunting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved various sorts of filtering arrays. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved digit sums and progressive multiplication. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved multi-level counts and word ordering. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved date offsets and parser construction. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved counting digits and matching bit-counts. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list processing and matrix testing. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved array analysis and string merging. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved a lot of counting. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved numerical searching and letter substitution. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved splitting strings and sorting rows. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved list filtering and sequence generation. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved decomposing sequences and searching for limit values. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved searching sequences and parsing strings. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved breaking lists into groups and building a numerical sequence. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved searching a string and adding matrix elements. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved gift allocation and letter pairs. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved random generation and spotting a linear recurrence. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved keyed sorting and digit searching. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved a list search and combinations. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved combinatorics and integer division. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved differentiating lists and processing matrices. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved sequence searching and another nested sort. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved substrings and array mapping. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved joining strings and matching characters. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved cumulative sums and complicated sorts. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and didn't involve array permutations. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved calculating change and finding loops. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved spotting sequences, and duplicating list entries. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved messing about with lists. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved reducing lists in various ways. (Note that this ends today. And 232 was cancelled as the administrator was unwell)

I’ve been doing the Weekly Challenges. The latest involved various list processing. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved number lists and word prefixes. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved analysing strings and picking over lists. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved inspecting integer elements and making iterative things less so. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and Roman mathematics. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved string convolution and array reduction. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved splitting sentences and processing arrays. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved string construction and numerical sequence analysis. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved prime counting and list selections. (Note that this ends today.)

I’ve been doing the Weekly Challenges. The latest involved sorted lists and iterative reductions. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved more finding strings that can be made out of letters, and a search for a subsequence. (Note that this is open until 18 June 2023.)

I’ve been doing the Weekly Challenges. The latest involved word breakdowns and perfect squares. (Note that this is open until 11 June 2023.)

I’ve been doing the Weekly Challenges. The latest involved sequence processing and a cost optimisation. (Note that this is open until 4 June 2023.)

I’ve been doing the Weekly Challenges. The latest involved list manipulation and bit flipping. (Note that this is open until 28 May 2023.)

I’ve been doing the Weekly Challenges. The latest involved various sorts of sorting. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved mucking about with words. (Note that this is open until 14 May 2023.)

I’ve been doing the Weekly Challenges. The latest involved sorting words and modifying sequences. (Note that this is open until 7 May 2023.)

I’ve been doing the Weekly Challenges. The latest involved score ranking and sequence manipulation. (Note that this is open until 30 April 2023.)

I’ve been doing the Weekly Challenges. The latest involved an unusual sort and a pathfinding problem. (Note that this is open until 23 April 2023.)

I’ve been doing the Weekly Challenges. The latest involved letter rearrangement and number grouping. (Note that this is open until 16 April 2023.)

I’ve been doing the Weekly Challenges. The latest involved matrix evaluation and integer searching. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved searching in lists of integers. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved decoding a sequence and merging lists. (Note that this closes for public solutions today.)

I’ve been doing the Weekly Challenges. The latest involved searching through arrays. (Note that this is closes today.)

I’ve been doing the Weekly Challenges. The latest involved letter sorting and an array calculation. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved lots of combinatorial searches. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved list parsing and combinations. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved list testing and matrix reconstruction. (Note that this is open until 19 February 2023.)

I’ve been doing the Weekly Challenges. The latest involved list searching and directory evaluation. (Note that this is open until 12 February 2023.)

I’ve been doing the Weekly Challenges. The latest involved various sorts of list filtering. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved an array search and a mathematical classic. (Note that this is open until 29 January 2023.)

I’ve been doing the Weekly Challenges. The latest involved array searching and an emulated seven-segment display. (Note that this is open until the end of today.)

I’ve been doing the Weekly Challenges. The latest involved filtering pairs and triplets out of a list. (Note that this ends today.)

I did Advent of Code again, and had a really good time. Spoilers.

I’ve been doing the Weekly Challenges. The latest involved analysing a list and counting primes. (Note that this is open until the end of today.)

I’ve been doing the Weekly Challenges. The latest involved list filtering and a perverse sort. (Note that this is open until tomorrow.)

I’ve been doing the Weekly Challenges. The latest involved looking for patterns in arrays. (Note that this closes today. Merry Christmas!)

I’ve been doing the Weekly Challenges. The latest involved integer filtering. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved expanding a search space and running a character frequency test. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved a binary expansion and string analysis. (Note that this closes today.)

I’ve been doing the Weekly Challenges. The latest involved a binary negation and list division. (Note that this is open until 27 November 2022.)

I’ve been doing the Weekly Challenges. The latest involved list sorting and permutation checking. (Note that this is open until 20 November 2022.)

I’ve been doing the Weekly Challenges. The latest involved checking capitalisation and decoding an ambiguous string. (Note that this is open until 13 November 2022.)

I’ve been doing the Weekly Challenges. The latest involved filtering character lists and finding subarrays. (Note that this is open until 6 November 2022.)

I’ve been doing the Weekly Challenges. The latest involved more list searching and a variation on the greatest common divisor. (Note that this is open until 30 October 2022.)

I’ve been doing the Weekly Challenges. The latest involved date overlaps and combination searches. (Note that this is open until 23 October 2022.)

I’ve been doing the Weekly Challenges. The latest involved combining lists and squashing unicode characters. (Note that this is open until 16 October 2022.)

I’ve been doing the Weekly Challenges. The latest involved various string manipulations. (Note that this is open until 9 October 2022.)

I’ve been doing the Weekly Challenges. The latest involved modifying and picking things out of sequences. (Note that this is open until 2 October 2022.)

I’ve been doing the Weekly Challenges. The latest involved array comparisons and date calculations. (Note that this is open until 25 September 2022.)

I’ve been doing the Weekly Challenges. The latest involved list searching and finding a common subpath. (Note that this is open until 18 September 2022.)

I’ve been doing the Weekly Challenges. The latest involved string splitting and data sorting. (Note that this is open until 11 September 2022.)

I’ve been doing the Weekly Challenges. The latest involved filtering strings and lists. (Note that this is open until 4 September 2022.)

I’ve been doing the Weekly Challenges. The latest involved ordinal numbers and Unicode generation. (Note that this is open until 28 August 2022.)

I’ve been doing the Weekly Challenges. The latest involved an unusual base representation and date calculations. (Note that this is open until 21 August 2022.)

I’ve been doing the Weekly Challenges. The latest involved a check-digit function and more number reversals. (Note that this is open until 14 August 2022.)

I’ve been doing the Weekly Challenges. The latest involved lots of number-string conversions. (Note that this is open until 7 August 2022.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and number theory. (Note that this is open until 31 July 2022.)

I’ve been doing the Weekly Challenges. The latest involved disarium numbers and ranked permutations. (Note that this is open until 24 July 2022.)

I’ve been doing the Weekly Challenges. The latest involved more mathematical tests. (Note that this is open until 17 July 2022.)

I’ve been doing the Weekly Challenges. The latest involved prime partitioning and some basic statistics. (Note that this is open until 10 July 2022.)

I’ve been doing the Weekly Challenges. The latest involved findind odd abundant numbers and first-class functions. (Note that this is open until 3 July 2022.)

I’ve been doing the Weekly Challenges. The latest involved primes and an unusual form of matrix multiplication. (Note that this is open until 26 June 2022.)

I’ve been doing the Weekly Challenges. The latest involved more numerical series. (Note that this is open until 19 June 2022.)

I’ve been doing the Weekly Challenges. The latest involved more furkling about with prime numbers. (Note that this is open until 12 June 2022.)

I’ve been doing the Weekly Challenges. The latest involved circular primes and the Lanczos approximation. (Note that this is open until 5 June 2022.)

I’ve been doing the Weekly Challenges. The latest involved word searching and directory mangling. (Note that this is open until 29 May 2022.)

I’ve been doing the Weekly Challenges. The latest involved generating SVG and fitting lines to points. (Note that this is open until 22 May 2022.)

Yes, I'm still programming in PostScript. Why? Because I enjoy it.

I’ve been doing the Weekly Challenges. The latest involved two number-sequence tasks. (Note that this is open until 15 May 2022.)

I’ve been doing the Weekly Challenges. The latest involved various summation-like operations. (Note that this is open until 8 May 2022.)

I’ve been doing the Weekly Challenges. The latest involved ISBN check digits and the Wheatstone-Playfair cipher. (Note that this is open until 1 May 2022.)

I’ve been doing the Weekly Challenges. The latest involved word selections and manipulations. (Note that this is open until 24 April 2022.)

I’ve been doing the Weekly Challenges. The latest involved English word lengths and array partitioning. (Note that this is open until 17 April 2022.)

I’ve been doing the Weekly Challenges. The latest involved generating more sequences. (Note that this is open until 10 April 2022.)

I’ve been doing the Weekly Challenges. The latest involved subsets of primes. (Note that this is open until 3 April 2022.)

I’ve been doing the Weekly Challenges. The latest involved a variety of means and more number theory. (Note that this is open until 27 March 2022.)

I’ve been doing the Weekly Challenges. The latest involved more number-theory definitions. (Note that this is open until 20 March 2022.)

I’ve been doing the Weekly Challenges. The latest involved more number theory problems. (Note that this is open until 13 March 2022.)

I’ve been doing the Weekly Challenges. The latest involved permutations and primality testing. (Note that this is open until 6 March 2022.)

I’ve been doing the Weekly Challenges. The latest involved various progressions based on factorials. (Note that this is open until 27 February 2022.)

I’ve been doing the Weekly Challenges. The latest involved finding minimum paths and overlapping rectangles. (Note that this is open until 20 February 2022.)

I’ve been doing the Weekly Challenges. The latest involved a return to binary trees and an optimisation puzzle. (Note that this is open until 13 February 2022.)

I’ve been doing the Weekly Challenges. The latest involved a Fibonacci-like word construction and a search for square-free numbers. (Note that this is open until 6 February 2022.)

I think this is the closest I've come to writing a Cthulhu Mythos document: if you don't know what's going on, it's harmless, but with a little knowledge it can be mildly disturbing…

I’ve been doing the Weekly Challenges. The latest involved just-in-time Fibonacci and squares without repeating digits. (Note that this is open until 30 January 2022.)

I’ve been doing the Weekly Challenges. The latest involved various sorts of numerical search. (Note that this is open until 23 January 2022.)

I’ve been doing the Weekly Challenges. The latest involved prime searches and pentagonal numbers. (Note that this is open until 16 January 2022.)

I’ve been doing the Weekly Challenges. The latest involved prime-counting and fraction trees. (Note that this is open until 9 January 2022.)

I’ve been doing the Weekly Challenges. The latest involved vector multiplication and a recently-invented data structure. (Note that this is open until 2 January 2022.)

I’ve been doing the Weekly Challenges. The latest involved some interesting mathematical sequences. (Note that this is open until 26 December 2021.)

I’ve been doing the Weekly Challenges. The latest involved counting divisors and another joke sort. (Note that this is open until 19 December 2021.)

I’ve been doing the Weekly Challenges. The latest involved counting divisors and another joke sort. (Note that this is open until 12 December 2021.)

I’ve been doing the Weekly Challenges. The latest involved an unusual binary encoding and indexing into a multiplication table. (Note that this is open until 5 December 2021.)

I’ve been doing the Weekly Challenges. The latest involved an unusual binary encoding and indexing into a multiplication table. (Note that this is open until 28 November 2021.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and numerical decompositions. (Note that this is open until 21 November 2021.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and numerical decompositions. (Note that this is open until 14 November 2021.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and numeric palindromes. (Note that this is open until 7 November 2021.)

I’ve been doing the Weekly Challenges. The latest involved GCDs, powers of two, and an unusual numeric sequence. (Note that this is open until 31 October 2021.)

I’ve been doing the Weekly Challenges. The latest involved digit substrings and securities validation. (Note that this is open until 24 October 2021.)

I’ve been doing the Weekly Challenges. The latest involved pandigital numbers and multiplication tables. (Note that this is open until 17 October 2021.)

I’ve been doing the Weekly Challenges. The latest involved Smith numbers and square roots. (Note that this is open until 10 October 2021.)

I’ve been doing the Weekly Challenges. The latest involved date calculations and inner joins. (Note that this is open until 3 October 2021.)

I’ve been doing the Weekly Challenges. The latest involved splitting arrays and strings. (Note that this is open until 26 September 2021.)

I’ve been doing the Weekly Challenges. The latest involved more binary trees and linked lists. (Note that this is open until 19 September 2021.)

I’ve been doing the Weekly Challenges. The latest involved more binary trees and linked lists. (Note that this is open until 12 September 2021.)

I’ve been doing the Weekly Challenges. The latest involved set intersections and merging intervals. (Note that this is open until 29 August 2021.)

I’ve been doing the Weekly Challenges. The latest involved Pythagorean triples and binary trees. (Note that this is open until 15 August 2021.)

I’ve been doing the Weekly Challenges. The latest involved ASCII graphics and set partitioning. (Note that this is open until 8 August 2021.)

I’ve been doing the Weekly Challenges. The latest involved regular numbers and geometrical squareness testing. (Note that this is open until 1 August 2021.)

I’ve been doing the Weekly Challenges. The latest involved a progressive average and additive compositions. (Note that this is open until 25 July 2021.)

I’ve been doing the Weekly Challenges. The latest involved more binary manipulation and a traditional problem. (Note that this is open until 18 July 2021.)

I’ve been doing the Perl Weekly Challenges. The latest involved more binary manipulation and analogue clocks. (Note that this is open until 11 July 2021.)

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