36: Same Tree

/************************************************************************/
        /*       36:      Same Tree                                          */
        /************************************************************************/
        /*
         *  Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.
         * */
        
        //判断两个二叉树是否完全一致 (递归解法)

 private Boolean IsSame(TreeNode nodeleft,TreeNode noderight) 
        {
            if(nodeleft==null&&noderight==null)
            {
                return true;
            }
            if(nodeleft==null||noderight==null)
            {
                return false;
            }
            return nodeleft.val==noderight.val&&IsSame(nodeleft.left, noderight.left)&&IsSame(nodeleft.right, noderight.right);
        }
        
        public boolean isSameTree(TreeNode p, TreeNode q) 
        {
            return IsSame(p,q);
        }