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Quaeritur descriptio
codice ac leetcode101Simillimum est.
Answer

        public boolean isSameTree(TreeNode p, TreeNode q) {
            if (p == null && q == null) { //p,q都为空
                return true;
            } else if (p == null || q == null) { //p和q中只有一个为空
                return false;
            } else { //p和q都不为空格
                return p.val == q.val && isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
            }
        }
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