[leetcode] 100. Same Tree 解题报告

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.

递归遍历

一刷：

    public boolean isSameTree(TreeNode p, TreeNode q) {
        if ((p == null && q != null) || (p != null && q == null)) return false;
        else if (p == null && q == null) return true;
        else  {
            if (p.val != q.val) { return  false; }
            else {
                return ( isSameTree(p.left, q.left) && isSameTree(p.right, q.right) );
            }
        }
    }