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.

Code:(C 语言)

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