46 lines
1.6 KiB
C#
46 lines
1.6 KiB
C#
using System.Diagnostics;
|
|
|
|
namespace aoc2020;
|
|
|
|
public static class Extensions
|
|
{
|
|
/// <summary>
|
|
/// increased accuracy for stopwatch based on frequency.
|
|
/// <see
|
|
/// href="http://geekswithblogs.net/BlackRabbitCoder/archive/2012/01/12/c.net-little-pitfalls-stopwatch-ticks-are-not-timespan-ticks.aspx">
|
|
/// blog
|
|
/// details here
|
|
/// </see>
|
|
/// </summary>
|
|
/// <param name="stopwatch"></param>
|
|
/// <returns></returns>
|
|
public static double ScaleMilliseconds(this Stopwatch stopwatch) =>
|
|
1_000 * stopwatch.ElapsedTicks / (double)Stopwatch.Frequency;
|
|
|
|
public static bool Contains(this Range range, int i) => i >= range.Start.Value && i <= range.End.Value;
|
|
|
|
/// <summary>
|
|
/// Given an array, it returns a rotated copy.
|
|
/// </summary>
|
|
/// <param name="array">The two dimensional jagged array to rotate.</param>
|
|
public static T[][] Rotate<T>(this T[][] array)
|
|
{
|
|
var result = new T[array[0].Length][];
|
|
for (var i = 0; i < result.Length; i++)
|
|
result[i] = new T[array.Length];
|
|
|
|
for (var i = 0; i < array.Length; i++)
|
|
for (var j = 0; j < array[i].Length; j++)
|
|
result[i][j] = array[array.Length - j - 1][i];
|
|
|
|
return result;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Given a jagged array, it returns a diagonally flipped copy.
|
|
/// </summary>
|
|
/// <param name="array">The two dimensional jagged array to flip.</param>
|
|
public static T[][] FlipHorizontally<T>(this IEnumerable<T[]> array) =>
|
|
array.Select(x => x.Reverse().ToArray()).ToArray();
|
|
}
|