100-Same-Tree.c

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