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using System.Numerics;
namespace aoc2021;
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;
/// <summary>
/// Does a <see cref="Range"/> include a given int?
/// </summary>
/// <param name="range"></param>
/// <param name="i"></param>
/// <returns></returns>
public static bool Contains(this Range range, int i) =>
i >= range.Start.Value && i <= range.End.Value;
/// <summary>
/// Creates a new BigInteger from a binary (Base2) string
/// <see href="https://gist.github.com/mjs3339/73042bc0e717f98796ee9fa131e458d4" />
/// </summary>
public static BigInteger BigIntegerFromBinaryString(this string binaryValue)
{
BigInteger res = 0;
if (binaryValue.Count(b => b == '1') + binaryValue.Count(b => b == '0') != binaryValue.Length) return res;
foreach (var c in binaryValue)
{
res <<= 1;
res += c == '1' ? 1 : 0;
}
return res;
}
}
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