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.

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/**
* 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;
} else if (p != NULL && q != NULL && p->val == q->val) {
return isSameTree(p->left,q->left) && isSameTree(p->right,q->right);
} else {
return false;
}
}
};