Leetcode 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.

bool isSameTree(TreeNode *p, TreeNode *q) {
    if(p == NULL || q == NULL) return p == q;
    else return (p->val == q->val) && isSameTree(p->left, q->left) && isSameTree(p->right,q->right);
}