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GROKKING NOTES

I liked the way Grokking the coding interview organized problems into learnable patterns. However, the course is expensive and the majority of the time the problems are copy-pasted from leetcode. As the explanations on leetcode are usually just as good, the course really boils down to being a glorified curated list of leetcode problems.

So below I made a list of leetcode problems that are as close to grokking problems as possible.

Pattern: Sliding Window

Activate Windows 8, 8.1, 10 and 11 Pro for Free

A guide how to get and activate Windows 8, 8.1, 10 and 11 Pro for free!

NOTE

If you see the Windows keyboard button in this guide; and you can't find it on your keyboard, you likely have/had Windows 10 which has the button . If you can't find that one, you likely have a PC that has been upgraded to Windows 8/8.1/10/11 from Windows 8.1/8/7/Vista/XP and other ones. If you have one of those, refer the Windows key button to as yours. A list of them is below:

Windows key buttons

- Windows 11

- Windows 10

Markdown Formatting Guide for Obsidian

Learn how to apply basic formatting to your Obsidian notes, using Markdown. Import this as a note into your Obsidian Vault to view it and to test new themes. Certain community plugins are required for a few features.

Basic Formatting Syntax

Paragraphs

To create paragraphs, use a blank line to separate one or more lines of text.

Converting mkv to mp4 with `ffmpeg`

Essentially just copy the existing video and audio stream as is into a new container, no funny business!

The easiest way to "convert" MKV to MP4, is to copy the existing video and audio streams and place them into a new container. This avoids any encoding task and hence no quality will be lost, it is also a fairly quick process and requires very little CPU power. The main factor is disk read/write speed.

With ffmpeg this can be achieved with -c copy. Older examples may use -vcodec copy -acodec copy which does the same thing.

These examples assume ffmpeg is in your PATH. If not just substitute with the full path to your ffmpeg binary.

	# this file contains keys needed for decryption of file system data (WUD/WUX)
	# 1 key per line, any text after a '#' character is considered a comment
	# the emulator will automatically pick the right key
	541b9889519b27d363cd21604b97c67a # example key (can be deleted)

	d7b00402659ba2abd2cb0db27fa2b656 # Common
	805e6285cd487de0faffaa65a6985e17 # Espresso Ancast
	b5d8ab06ed7f6cfc529f2ce1b4ea32fd # Starbuck Ancast

	9a164ee15ac7ceb64d3cc130094095f6 # 007 Legends [EUR, NUS]

	// Файл "tsconfig.json":
	// - устанавливает корневой каталог проекта TypeScript;
	// - выполняет настройку параметров компиляции;
	// - устанавливает файлы проекта.
	// Присутствие файла "tsconfig.json" в папке указывает TypeScript, что это корневая папка проекта.
	// Внутри "tsconfig.json" указываются настройки компилятора TypeScript и корневые файлы проекта.
	// Программа компилятора "tsc" ищет файл "tsconfig.json" сначала в папке, где она расположена, затем поднимается выше и ищет в родительских папках согласно их вложенности друг в друга.
	// Команда "tsc --project C:\path\to\my\project\folder" берет файл "tsconfig.json" из папки, расположенной по данному пути.
	// Файл "tsconfig.json" может быть полностью пустым, тогда компилятор скомпилирует все файлы с настройками заданными по умолчанию.
	// Опции компилятора, перечисленные в командной строке перезаписывают собой опции, заданные в файле "tsconfig.json".

	#!/usr/bin/env perl
	#
	# Written by John Gruber, taken with permission from:
	# http://daringfireball.net/2007/03/javascript_bookmarklet_builder

	use strict;
	use warnings;
	use URI::Escape qw(uri_escape_utf8);
	use open IO => ":utf8", # UTF8 by default
	":std"; # Apply to STDIN/STDOUT/STDERR

	# Script author: Matt Graeber (@mattifestation)
	# logman start AMSITrace -p Microsoft-Antimalware-Scan-Interface Event1 -o AMSITrace.etl -ets
	# Do your malicious things here that would be logged by AMSI
	# logman stop AMSITrace -ets

	$OSArchProperty = Get-CimInstance -ClassName Win32_OperatingSystem -Property OSArchitecture
	$OSArch = $OSArchProperty.OSArchitecture

	$OSPointerSize = 32
	if ($OSArch -eq '64-bit') { $OSPointerSize = 64 }

	#!/bin/sh
	#
	# Janos Kasza (@janoskk)
	#
	# Creates (if necessary) and replicates all databases from a couchdb server to another one
	#

	if [ -z "$2" ]; then
	cat <<EOF
	Usage: $0 <sourceUrl> <targetUrl>