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@jakobkogler
jakobkogler / benchmark_output.txt
Created July 1, 2021 19:59
Benchmark prime sieve speed between vector<char> and vector<bool>
>> g++ -std=c++20 -Ofast benchmark_prime_sieve.cpp && ./a.out
N = 30000000:
norm: bool: 106 ms
norm: char: 235 ms
norm: bool is 2.217 times FASTER
seg: bool: 147 ms
seg: char: 38 ms
seg: bool is 3.868 times SLOWER
N = 60000000:
@x0nu11byt3
x0nu11byt3 / elf_format_cheatsheet.md
Created February 27, 2021 05:26
ELF Format Cheatsheet

ELF Format Cheatsheet

Introduction

Executable and Linkable Format (ELF), is the default binary format on Linux-based systems.

ELF

Compilation

@atoonk
atoonk / AWS_v4prefixes.md
Last active May 10, 2025 21:52
AWS prefixes

Summary

Total number of IPv4 addresses: 100,750,168. That’s the equivalent of just over six /8’s Also see this blog: https://toonk.io/aws-and-their-billions-in-ipv4-addresses/

just for fun, let's put a value number on that

Total value at, $20 per IP: => $2,015,003,360

Total value at, $25 per IP: => $2,518,754,200

@orlp
orlp / mazejudge.py
Last active January 17, 2021 10:58
import collections
import numpy as np
import scipy.sparse
import scipy.sparse.linalg
import sys
import imageio
import io
import base64
class MazeJudge:
@shivams
shivams / textlive-full-beefless.md
Last active June 17, 2024 17:15
`texlive-full` without the beef

TLDR;

On an Debian/Ubuntu-based system, to install texlive-full without docs and language packs, simply do this:

sudo apt install `sudo apt --assume-no install texlive-full | \
		awk '/The following additional packages will be installed/{f=1;next} /Suggested packages/{f=0} f' | \
		tr ' ' '\n' | grep -vP 'doc$' | grep -vP 'texlive-lang' | grep -vP 'latex-cjk' | tr '\n' ' '`

After this, if you wish to install the language packs, selectively install them. E.g.:

@jakelevi1996
jakelevi1996 / Multiple source files in C.md
Last active May 16, 2026 03:08
Multiple source files in C.

Multiple source files in C

This Gist presents an introduction to a few different ways of working with multiple source files in C, including:

  1. Simple .c source files and .h header files compiled into a .exe
  2. First compiling into .o object files, and then linking together
  3. Makefiles
  4. Statically linked libraries
  5. Dynamically linked libraries

The concepts are demonstrated using gcc (tdm64-1) 5.1.0 on Windows 8.1, using 3 C source files (linkedlist.c, listprimes.c and main.c) and 2 header files (linkedlist.h and listprimes.h), all of which are included at the end. It is assumed that all the source files are saved in a single directory, and any terminal commands are entered in a terminal window open in that same directory.

@Bilka2
Bilka2 / control.lua
Last active January 27, 2026 05:43
Create a timelapse from a factorio replay save file
-- Just add this to the end of the control.lua file in the save file and then replay the file
-- This sequence is adjusted for https://www.speedrun.com/Factorio/run/mr87xlgy
script.on_nth_tick(300, function(event)
if event.tick < 90000 then
game.take_screenshot{
surface = game.surfaces[1],
position = {-88,-9},
resolution = {1920,1080},
zoom = 0.2,
@seanh
seanh / html_tags_you_can_use_on_github.md
Last active June 30, 2026 11:50
HTML Tags You Can Use on GitHub

HTML Tags You Can Use on GitHub

Wherever HTML is rendered on GitHub (gists, README files in repos, comments on issues and pull requests, ...) you can use any of the HTML elements that GitHub Flavored Markdown (GFM) provides syntactic sugar for. You can either use the syntactic sugar that GFM (or other GitHub-supported markup language you're using) provides or, since Markdown can contain raw HTML, you can enter the HTML tags manually.

But GitHub also allows you to use a few HTML elements beyond what Markdown provides by entering the tags manually, and some of them are styled with CSS. Most raw HTML tags get stripped before rendering the HTML. Those tags that can be generated by GFM syntactic sugar, plus a few more, are whitelisted. These aren't documented anywhere that I can find. Here's what I've discovered so far:

<details> and <summary>

A `<detai