Gabriel Vanca gabriel-vanca

Inspired by this article. Neat tricks for speeding up integer computations.

Note: cin.sync_with_stdio(false); disables synchronous IO and gives you a performance boost. If used, you should only use cin for reading input (don't use both cin and scanf when sync is disabled, for example) or you will get unexpected results.

Multiply by a power of 2

x = x << 1; // x = x * 2

using System.Collections.Generic;
using System.Linq;

namespace Utility.Extensions
{
    public static class IEnumerableExtensions
    {
        public static IEnumerable<(T item, int index)> WithIndex<T>(this IEnumerable<T> self)
 =&gt; self?.Select((item, index) =&gt; (item, index)) ?? new List&lt;(T, int)&gt;();

	<#
	.SYNOPSIS
	This function performs a search of a hash table using a provided key.
	.DESCRIPTION
	This function performs a search of a hash table using a provided key.
	It returns the value matching the key if found, and null otherwise.
	The case sensitive search has O(1) time complexity while the case insensitive search has
	O(N) time complexity, where N is the number of key-value pairs in the hash table.
	#>

	<#
	.SYNOPSIS
	A brief description of the function or script. This keyword can be used only once in each topic.

	.DESCRIPTION
	A detailed description of the function or script. This keyword can be used only once in each topic.

	.COMPONENT
	The name of the technology or feature that the function or script uses, or to which it is related.

	function Get-InstalledDotNetFrameworkFromRegistry {
	<#
	.SYNOPSIS
	Display version of .net installed on a system
	.DESCRIPTION
	Query the registry on a local or remote system to display the version of .net installed
	.PARAMETER ComputerName
	The name of the computer to run the query on
	#>

	function Test-Repo {
	param (
	[Parameter(Mandatory)] [ValidateNotNullOrEmpty()] [String] $Repo
	)

	$repoName = $NULL

	try {
	$testUri = "https://api.github.com/repos/$Repo"
	$temp = (Invoke-RestMethod -Method GET -Uri $testUri)

	function Join-Strings
	{
	<#
	.SYNOPSIS
	Join strings with a specified separator.

	.DESCRIPTION
	Join strings with a specified separator.

	This strips out null values and any duplicate separator characters.