具体实现过程需要根据实际情况而定，以下代码示例仅供参考。

/**

• Definition for singly-linked list.
• struct ListNode {

• int val;
  

• struct ListNode *next;
  

• }; */

struct ListNode* deleteUnvisitedNodes(struct ListNode* head) { struct ListNode* cur = head; struct ListNode* prev = NULL;

while (cur) {
    if (cur->val % 2 == 0) { // 节点值为偶数时访问，否则跳过该节点
        prev = cur;
        cur = cur->next;
    } else {
        if (prev == NULL) {
            head = cur->next;
        } else {
            prev->next = cur->next;
        }
        struct ListNode* next = cur->next;
        free(cur);
        cur = next;
    }
}

return head;

}