[BOJ/C#] 3009 네 번째 점

https://www.acmicpc.net/problem/3009

3009번: 네 번째 점

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Numerics;
using System.Text;

namespace BOJ
{
    class Program
    {
        static void Main(string[] args)
        {
            StreamReader sr = new StreamReader(new BufferedStream(Console.OpenStandardInput()));
            StreamWriter sw = new StreamWriter(new BufferedStream(Console.OpenStandardOutput()));

            
            Dictionary<int, int> dic1 = new Dictionary<int, int>();
            Dictionary<int, int> dic2 = new Dictionary<int, int>();
            
            for (int i = 0; i < 3; i++)
            {
                int[] xy = Array.ConvertAll(sr.ReadLine().Split(), int.Parse);
            
                //sw.WriteLine("{0} {1}", xy[0], xy[1]);
                if(dic1.ContainsKey(xy[0])) dic1[xy[0]]++;
                else dic1.Add(xy[0], 1);
                
                if(dic2.ContainsKey(xy[1])) dic2[xy[1]]++;
                else dic2.Add(xy[1], 1);
            }

            var a = dic1.Where(x => x.Value != 2).First();
            var b = dic2.Where(x => x.Value != 2).First();
            sw.WriteLine("{0} {1}", a.Key, b.Key);
            
            sr.Close();
            sw.Close();
        }
    }
}