please tell me what is the runtime error in my code? SACO19A( SACRED CODE)

import java.util.*;

import java.lang.*;

import java.io.*;

class Codechef

{ public int x,seat; public String S, l;

Codechef()

{
    this.x=0;

    this.S="";

    this.l="";

this.seat=0;

}

public static void main (String[] args) 

{   Scanner s=new Scanner(System.in);

    int t=s.nextInt();

    int T=1,N,Q;

    while(T<=t)

    {
        N=s.nextInt();

        Q=s.nextInt();
	 int a[]=new int[Q];int b[]=new int[Q];

Codechef c[]=new Codechef[N3];
for(int i=0
;i<N
3;i++)

    	{c[i]=new Codechef();}
	
	int[] p=new int[N*3];
	String[] q=new String[N*3];
	String[] r=new String[N*3];
        for(int i=0;i<N*3;i++)

        {   p[i]=s.nextInt();
            c[i].x=p[i];
            
        q[i]=s.next();

         c[i].S=q[i];
	 
         r[i]=s.next();
         c[i].l=r[i];
	
	  	
            }

        

for(int i=0;i<Q;i++)

        { 
            a[i]=s.nextInt();

            b[i]=s.nextInt();

}

for(int i=0;i<N*3;i++)
	{if(c[i].l.equalsIgnoreCase("y")==true)

            {
 c[i].seat=1;
 }

            else{

	for(int j=0;j<N*3;j++)

              {
  if(i!=j)

                  {

if( c[i].x==c[j].x)

                     {
 if(c[j].l.equalsIgnoreCase("y")==false)

                         {  if((c[i].S.compareTo(c[j].S))>0) 

                             {
      c[i].seat=3 ;      }
			   else

                         {  c[i].seat=2 ;

}

                     }
                  }
              }
            }
        }

}
for(int f=0;f<Q;f++)

        {

for(int j=0;j<N*3;j++)

           { if(a[f]==c[j].x && b[f]==c[j].seat)


                {System.out.println(c[j].S);
            }}
        }


        
        
        
        
        
        T++;
    }
}

}

//