Method to merge given two binary trees
public static Node MergeTrees ( Node t1 , Node t2 ) { if ( t1 == null ) { return t2 ; } if ( t2 == null ) { return t1 ; } t1 . data += t2 . data ; t1 . left = MergeTrees ( t1 . left , t2 . left ) ; t1 . right = MergeTrees ( t1 . right , t2 . right ) ; return t1 ; }