Yeah... I'm tricky :D

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Threading;

namespace scred {
    class Program
    {
        static int n;
        static void Main(string[] args)
        {
            String nS = Console.ReadLine();
            n = Convert.ToInt32(nS);
            for (int ni = 1; ni <= n; ni++)
            {
                String cS = Console.ReadLine();
                int c = Convert.ToInt32(cS);
                String iS = Console.ReadLine();
                int i = Convert.ToInt32(iS);
                String[] p = Console.ReadLine().Split(' ');
                for (int a = 1; a <= p.Length-2; a++)
                {
                    bool done = false;
                    for (int b = 1; b <= p.Length-2; a++)
                    {
                        if ((Convert.ToInt32(p[a]) + Convert.ToInt32(p[b])) == c)
                        {
                            Console.WriteLine("Case #" + ni + ": " + a + " " + b);
                            Thread.Sleep(1000);
                            done = true;
                            break;
                        }
                        else
                        {
                            done = false;
                        }
                    }
                    if (done) break;
                }
            }
        }
    }
}