public class LCSDynamic{

  int lcs(char X[], char Y[], int m, int n){

    int L[][] = new int[m+1][n+1];

    for(int i=0; i<=m; i++){

      for(int j=0; j<=n; j++){
        
        if(i==0 || j==0)
          L[i][j] =0;
        else if (X[i-1] == Y[j-1])
          L[i][j] = L[i-1][j-1]+1;

        else
          L[i][j] = max(L[i-1][j], L[i][j-1]); 
      }
    }

    return L[m][n];
  }

  int max(int a, int b){
    return (a>b)?a:b;

  }


  public static void main(String[] args){

    LCSDynamic l = new LCSDynamic();

    String s1 = "AGGTAB";
    String s2 = "GXTXAYB";
 
    char[] X=s1.toCharArray();
    char[] Y=s2.toCharArray();
    int m = X.length;
    int n = Y.length;

    System.out.println(l.lcs(X,Y,m,n));
  }
}