Scramble String

public class Solution {
    public boolean isScramble(String s1, String s2) {
        // IMPORTANT: Please reset any member data you declared, as
        // the same Solution instance will be reused for each test case.
        int n=s1.length();
        boolean[][][] dp=new boolean[n][n][n+1];
        
        for(int i=n-1; i>=0; i--)
            for(int j=n-1; j>=0; j--)
                for(int k=1; k<=n-Math.max(i,j);k++)
                {
                    if(s1.substring(i,i+k).equals(s2.substring(j,j+k)))
                        dp[i][j][k]=true;
                    else
                    {
                        for(int l=1; l<k; l++)
                        {
                            if(dp[i][j][l] && dp[i+l][j+l][k-l] || dp[i][j+k-l][l] && dp[i+l][j][k-l])
                            {
                                dp[i][j][k]=true;
                                break;
                            }
                        }
                    }
                }
        
        return dp[0][0][n];
    }
}