AdventOfCode23/Day5/Range.cs

namespace Day5;

public record Range(long SrcIndex, long DstIndex, long Length)
{
    public static Range Identity { get; } = new Range(0, 0, long.MaxValue);
    
    public bool IsMatch(long value)
    {
        return SrcIndex <= value && value < SrcIndex + Length;
    }

    public long Transform(long value)
    {
        return DstIndex + (value - SrcIndex);
    }
}