Poj Solution 3356

http://poj.org/problem?id=3356

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;


public class Main{

public static void main(String[] args) throws Exception{
 BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
 String str ;
 while((str=in.readLine())!=null){
  StringTokenizer toke1 = new StringTokenizer(str);
  StringTokenizer toke2 = new StringTokenizer(in.readLine());
  int m = Integer.parseInt(toke1.nextToken());
  String str1 = toke1.nextToken();
  int n = Integer.parseInt(toke2.nextToken());
  String str2 = toke2.nextToken();
        
  int[][]array = new int[m+1][n+1];
        
  for(int i=0;i<=m;i++){
    array[i][0] = i;
  }
  for(int i=0;i<=n;i++){
    array[0][i] = i;
    }
        
  for(int i=1;i<=m;i++){
    for(int j=1;j<=n;j++){
     if(str1.charAt(i-1)==str2.charAt(j-1))
      array[i][j] = Math.min(Math.min(array[i-1][j-1], array[i-1][j]+1), array[i][j-1]+1);
     else
      array[i][j] = Math.min(Math.min(array[i-1][j-1]+1, array[i-1][j]+1), array[i][j-1]+1);
    }
    }
        
    System.out.println(array[m][n]);
    }
    }

}