project euler 18, C#

Language: Layout:

//most interesting so far

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            List<Row> rows = new List<Row>();
            var s = Console.In.ReadToEnd();
            foreach(var r in s.Split("\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries))
            {
                List<int> row = new List<int>();
                r.Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList().ForEach(f => row.Add(Convert.ToInt32(f)));
                rows.Add(new Row(){ Numbers = row });
            }
            
            while(rows.Count() > 1)
            {
                Row last = rows[rows.Count-1];
                Row before_last = rows[rows.Count-2];
                Row combined = new Row() { Numbers = new List<int>() };
                    
                for(int i=0; i<before_last.Numbers.Count; i++)
                {
                    int max = -1;
                    for(int j=i; j<i+2 && j<last.Numbers.Count; j++)
                    {
                        if(before_last.Numbers[i]+last.Numbers[j] > max)
                            max = before_last.Numbers[i]+last.Numbers[j];
                    }
                    combined.Numbers.Add(max);
                }
                rows.Remove(last);
                rows.Remove(before_last);
                rows.Add(combined);
                //combined.Numbers.ForEach(f => Console.Write(f+" "));
                //Console.WriteLine();
            }
            
            Console.WriteLine(rows[0].Numbers[0]);
        }
    }
    
    public class Row
    {
        public List<int> Numbers {get; set;}
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0.4 sec, absolute running time: 0.14 sec, cpu time: 0.11 sec, average memory usage: 20 Mb, average nr of threads: 4