Poj Solution 3087

http://poj.org/problem?id=3087

/* @author: */

import java.util.*;
import java.io.*;
import java.lang.reflect.Array;

public class Main {
 static int a[] = new int[200];
 static char start[], result[];
    
 static public void main( String [] str ) throws Exception{
   int n;
   int m;
   Scanner cin = new Scanner( System.in );
   n = cin.nextInt();
   for( int k=1; k<=n; k++ ) {
    m = cin.nextInt();
    String input1 = cin.next(),
    input2 = cin.next(),
    input3 = cin.next();
    input1 += input2;
    start = input1.toCharArray();
    boolean [] sign = new boolean[m*2];
    for( int i=0; i< m; i++ )
         a[i] = i*2+1;
    for( int i=m; i< m*2; i++ )
      a[i] = (i-m)*2;
            
    int i;
    for( i=0; ; i++ ) {
      //System.out.println( start );
      if( input3.equals( String.valueOf(start) ) )
        break;
            
    for( int j=0; j< 2*m; j++)
      sign[j] = false;
                
    for( int j=0; j< 2*m; j++ ) {
      if( !sign[j] ) {
        char t = start[j], tt;
        sign[j] = true;
        for( int l=a[j]; l!=j; l=a[l] ) {
        sign[l] = true;
        tt = start[l];
        start[l] = t;
        t = tt;
        }
        start[j] = t;
      }
    }
                
    if( input1.equals( String.valueOf(start) ) ) {
       i = -1;
       break;
    }
    }
            
    System.out.println( k+" "+i );
   }
   return;
  }
}