using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<string> myList = new List<string>();

        myList.Add("1 120 12"); 

        myList.Add("1 130 22"); 

        myList.Add("2 110 21"); 

        myList.Add("2 100 18");

        var parsed = (from item in myList

                      let split = item.Split(' ')

                      select new 

                      { 

                          ID = int.Parse(split[0]),

                          Foo = int.Parse(split[1]),

                          Bar = int.Parse(split[2])

                      });

        var summed = (from item in parsed

                      group item by item.ID into groupedByID

                      select new 

                      {

                          ID = groupedByID.Key,

                          SumOfFoo = groupedByID.Sum(g => g.Foo),

                          SumOfBar = groupedByID.Sum(g => g.Bar)

                      }).ToList();

        foreach (var s in summed)

        {

            Console.WriteLine($"ID: {s.ID}, SumOfFoo: {s.SumOfFoo}, SumOfBar: {s.SumOfBar}");

        }

    }

}