a5, C# - rextester

Language: Layout:

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            int[] firstt ={1, 5, 6};
            int[] secondd ={1, 6, 3};
          int[] a5(int[] first , int[] second)
          {
              
              int[] sav =new int[2];
              int y=0 ;
              bool w= true;
              if(first == null ||second == null ||first.Length<0 || second.Length<0) 
              {
                  return null;
              }
              else
              {
              for(int i=0;i<first.Length;i++)
              {
                 w=true; 
              for(int o=0;o<second.Length;o++)
              {
                  if(first[i]==second[o])
                  {
                      for(int r=0; r <sav.Length; r++)
                      {
                          if(sav[r]==second[o])
                          {
                            w=false;  
                          }
                      
                      }
                      if(w==true)
                      {
                       
                       sav[y]=second[o];
                          y++;   
                      }
                      
                    
                  }
              }
              }
              }
              return sav;
          }
            int[] tess=a5(firstt, secondd);
            
            Console.WriteLine(tess[2]);

}
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,2 sec, absolute running time: 0,11 sec, cpu time: 0,11 sec, average memory usage: 15 Mb, average nr of threads: 3, absolute service time: 0,33 sec