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harrytallbelt /
Last active Jun 10, 2020
Finds all anagrams for given words (Python 3).
import math
import itertools
# Tested with dictionary from
WORDS_DICT_FILENAME = 'words_dictionary.json'
__dict = None
def get_valid_words():
global __dict
if __dict:
harrytallbelt / transpose-in-place.js
Last active Jun 10, 2020
M*N matrix transposition in place (O(1) memory) in JavaScript and Python.
View transpose-in-place.js
// matrix -- a 1D array, that stores matrix A[rows,columns] by rows
// i.e. [A[0,0],A[0,1],..,A[0,columns-1],A[1,0],A[1,1],..,A[1,columns-1],..]
// rows -- number of rows in A
// columns -- number of columns in A
function transpose(matrix, rows, columns) {
// Let's write down some index conversion functions.
// You can convert 1D array index to
// (rows*columns) matrix index like that
const C = k => [Math.floor(k / columns), k % columns]
// You can do the reverse this way:
harrytallbelt /
Last active Nov 8, 2017
Create a local bare repo, you can (put in Dropbox folder) use like remote.
# Create a new bare repo.
cd origin-parh
mkdir repo.git
cd repo.git
git --bare init
# Make an already existing repo bare.
cd origin-parh
mkdir repo
cd repo
harrytallbelt /
Created Oct 31, 2017
helpful bash commands
# count lines in all inner js files of a project
cat `find . | grep -v 'node_modules' | grep '.*.js$'` | wc -l
# list all the js files that contain a word
grep -v 'node_modules' | grep '.*.js$' | xargs grep 'SEARCHWORD' -l
harrytallbelt / matrix.js
Created Oct 25, 2017
A satisfying Matrix effect with Node.JS.
View matrix.js
const LINE_WIDTH = 80 // 150
const FRAMERATE = 100
console.log('\x1b[32m') // green text
console.log('\x1b[40m') // black bg
let line = []
for (let i = 0; i < LINE_WIDTH / 2; ++i) {
harrytallbelt / format-simplify.js
Created Oct 6, 2017
A bit of code for pretty formatting Simplify predicates. It can be used to parse and format s-lists if you throw a few lines out
View format-simplify.js
// Indentation unit: predicate components are indented with this string,
// repeated several times, depending on their nesting level.
// Use '' for no identation.
// All lines end with this string; predicates on the top level
// are separated with twice this string.
// Use ' ' for a one-line output ('' won't lead to valid predicates).
// An s-list shorter than this would be a one-liner.
// This number is not exact, though (see `estimatedLength`).
harrytallbelt /
Created Mar 20, 2017
Bash script to convert coloured photos to (much smaller) grayscale using imagemagick package.
mkdir results
for image in *.jpg
convert -colorspace Gray -interlace Plane -gaussian-blur 0.05 -quality 50% $image ./results/$image
harrytallbelt / waterCapacity.fs
Created May 18, 2016
F# solution for water on land problem
View waterCapacity.fs
let oneWayCapacity a =
let mutable max = 0
a |> (fun e -> if e > max then max <- e; 0 else max - e)
let totalCapacity a =
let aL = a |> oneWayCapacity
let aR = a |> List.rev |> oneWayCapacity |> List.rev
List.map2 min aL aR |> List.sum
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