1379. 找出克隆二叉树中的相同节点

class Solution {
public:
    TreeNode *targetNode;
    TreeNode *resultNode;

    TreeNode *getTargetCopy(TreeNode *original, TreeNode *cloned, TreeNode *target) {
        targetNode = target;
        bool res = dfs(cloned);
        return resultNode;
    }

    bool dfs(TreeNode *root) {
        if (root == NULL) return false;
        if (root->val == targetNode->val) {
            resultNode = root;
            return true;
        }
        if (root->left != NULL) dfs(root->left);
        if (root->right != NULL) dfs(root->right);
        return false;
    }
};