main.cpp

#include <iostream>
#include <bits/stdc++.h>

using namespace std;

struct TreeNode
{
    int val;
    TreeNode *left;
    TreeNode *right;
    TreeNode() : val(0), left(nullptr), right(nullptr) {}
    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
};

class Solution
{
public:
    bool isSameTree(TreeNode *p, TreeNode *q)
    {
        if (p == NULL && q == NULL)
            return true;
        if (p == NULL || q == NULL)
            return false;
        if (p->val != q->val)
            return false;
        return isSameTree(p->right, q->right) && isSameTree(p->left, q->left);
    }
};

int main()
{
    Solution s;
    TreeNode *p = new TreeNode(1);
    TreeNode *q = new TreeNode(1);
    cout << s.isSameTree(p, q) << endl;
    return 0;
}