在C++中删除链表中主索引处的节点

struct ListNode {
    int val;
    ListNode* next;
    ListNode(int x) : val(x), next(nullptr) {}
};

ListNode* deleteNode(ListNode* head, int val) {
    ListNode* dummy = new ListNode(0);
    dummy->next = head;
    ListNode* curr = dummy;

    while (curr->next != nullptr && curr->next->val != val) {
        curr = curr->next;
    }

    if (curr->next != nullptr) {
        ListNode* temp = curr->next;
        curr->next = curr->next->next;
        delete temp;
    }

    ListNode* newHead = dummy->next;
    delete dummy;
    return newHead;
}