hdf’s gists

hdf / totp.html

Last active March 3, 2025 09:10

Input Secret, see TOTP code

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/fontawesome.min.css">
	<title>TOTP</title>
	<style>
	* {
	padding: 0;

hdf / combine2len.py

Last active January 5, 2023 14:39

Crossword puzzle solving helpers.

	# Usage:
	# ---
	# python combine2len.py [total_len [num_num_spaces ['words.txt' ['banned.txt']]]]

	from itertools import combinations
	from pprint import pprint
	from sys import argv

	def get_combinations(strings, num_strings, total_length):
	result = []

hdf / crc32_quine.cpp

Last active November 2, 2022 11:33 — forked from praetoriansentry/main.go

Program to find crc32 collision, generates output like: `Hello, my hash is: 1A745BD7! :)`

	// To compile:
	// nvcc -O3 -Xcompiler -openmp crc32_quine.cpp -o crc32_quine

	// Inspired by: https://gist.github.com/praetoriansentry/03b6dc2e68e174ffd8168aef7d85f910
	// (Can be timed with: http://www.pc-tools.net/win32/ptime/)
	// (Was not able to make it faster than the insiration, golang is impressive.)

	#include <stdio.h> // printf, sprintf
	#include "Crc32.cpp" // From: https://github.com/stbrumme/crc32

hdf / div_hist.py

Created June 8, 2021 18:52

Recursive divisibility histogram

	import sys
	import numpy as np
	import matplotlib.pyplot as plt

	## Recursive divisibility histogram
	# How many times can we divide a number by an integer, and by how many integers?
	# Divisors start from 2 and increase by 1 until we reach half of the number.
	# Show 3D histogram.

	n = int(sys.argv[1]) if len(sys.argv) > 1 and sys.argv[1].isdigit() else 180

hdf / q.txt

Created February 27, 2021 13:11

Dilemma solutions.

	Chicken and egg dilemma solution:
	---
	Description of the dilemma:
	What came first, the chicken or the [chicken] egg? (Eggs in general certainly existed before chickens did.)

	Statistical approach:
	Almost all chickens lay eggs. But most eggs do not hatch to be chickens. (Most are not fertilized, or it is a rooster that hatches.) Thus it is far more likely for an egg to come from a chicken, (thus chicken coming first) than for a chicken to come from an egg.
	Nomenclaturical approach:
	The egg that the first chicken came out of was laid by a proto-chicken. Since it could not be known ahead of time, what would emerge from the egg, it is logical to say, that a proto-chicken lays proto-chicken eggs, even if it is a chicken that emerges from it. Here as well the chicken came first (as it emerged from a proto-chicken egg).
	Meta approach:

hdf / index.html

Last active February 5, 2021 23:17 — forked from hynekcer/maxsubstring.py

fast longest common substring - by suffix array

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<title>Redundancy checker</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<!--<script src="lrs.min.js"></script>-->
	<style>
	html {
	font-family: 'Verdana', sans-serif;

hdf / conway.py

Last active October 24, 2020 14:42

My solution(s) to John Conway's 10 Digit number puzzle: (https://www.quantamagazine.org/three-math-puzzles-inspired-by-john-horton-conway-20201015/)

hdf / bank.py

Created May 29, 2020 13:11

Little Python script to validate bank account numbers

hdf / replace.py

Last active July 22, 2020 16:45

Replace a marked block part of a file, with the contents of another file. Ex.: replace.py file.html data.txt //begin //end

 import sys
 orig = sys.argv[1] if len(sys.argv) > 1 else 'kocka.html'
 data = sys.argv[2] if len(sys.argv) > 2 else 'L5_A-17_365000napig_bennmarado_3650napig.txt'
 start = sys.argv[3] if len(sys.argv) > 3 else '// begin_data'
 end = sys.argv[4] if len(sys.argv) > 4 else '// end_data'
 no_backup = True if len(sys.argv) > 5 and sys.argv[5] == 'no_backup' else False
 clean = True if data == 'clean' else False
 with open(orig, 'r+', encoding='utf-8') as f:

hdf / wavegen.py

Created April 1, 2020 22:25

Waveform generation example

	import pyaudio
	import numpy as np
	from scipy import signal as sg
	from scipy.io.wavfile import write

	p = pyaudio.PyAudio()

	volume = 1.0 # range [0.0, 1.0]
	fs = 44100 # sampling rate, Hz, must be integer
	duration = 1.0 # in seconds, may be float