LeetCode100: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.

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */
bool isSameTree(struct TreeNode* p, struct TreeNode* q) 
{
    if((p == NULL && q == NULL) ||( p != NULL && q != NULL && p->val == q->val && isSameTree(p->left,q->left) && isSameTree(p->right,q->right)))
    {
        return true;
    }
    return false;
}