97. Interleaving String

public class Solution { public boolean isInterleave(String s1, String s2, String s3) { if(s1.length()+s2.length() !=s3.length()) { return false; }else { boolean fg[][] = new boolean[s1.length()+1][s2.length()+1]; fg[0][0] = true; for(int i = 1; i< s1.length()+1;i++) { if(s1.charAt(i-1) == s3.charAt(i-1) && fg[i-1][0]) { fg[i][0] = true; } } for(int i = 1; i < s2.length()+1;i++) { if(s2.charAt(i-1) == s3.charAt(i-1) && fg[0][i-1]) { fg[0][i] = true; } } for(int i = 1; i < s1.length()+1; i++) { for(int j=1; j < s2.length()+1; j++) { if(s1.charAt(i-1) == s3.charAt(i+j-1) && fg[i-1][j]) { fg[i][j] = true; } if(s2.charAt(j-1) == s3.charAt(i+j-1) &&fg[i][j-1]) { fg[i][j] = true; } } } return fg[s1.length()][s2.length()]; } } }