Leetcode 100 Solution

This article provides solution to leetcode question 100 (same-tree)
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https://leetcode.com/problems/same-tree

Solution

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool isSameTree(TreeNode* p, TreeNode* q) {
        if (p == NULL && q == NULL)
            return true;

        if (p == NULL || q == NULL)
            return false;

        return p->val == q->val && isSameTree(p->left, q->left) && isSameTree(p->right, q->right);
    }
};