LeetCode - Same Tree

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Xin Qiu Jul 07, 2015
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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) 
        return true;
    if((p != NULL && q == NULL)||(p == NULL && q != NULL))
        return false;
    if(p->val != q->val)
        return false;
    return isSameTree(p->left,q->left) && isSameTree(p->right,q->right);
}