题解 | #删除链表峰值#

/**
 * struct ListNode {
 *	int val;
 *	struct ListNode *next;
 * };
 */
/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 * 
 * @param head ListNode类 
 * @return ListNode类
 */
struct ListNode* deleteNodes(struct ListNode* head ) {
    // write code here
    struct ListNode* p,*q,*head1;
    p = head;
    if(p == NULL||p->next==NULL||p->next->next==NULL) return p;
    head1 = (struct ListNode*)malloc(sizeof(struct ListNode));
    q=head1;
    while(p != NULL){
        q->val = p->val;
        q->next = NULL;
        p = p->next;
        if(p != NULL){
            q->next = (struct ListNode*)malloc(sizeof(struct ListNode));
            q = q->next;
        }
    }
    q = head1;
    p = head;
    while(p->next->next != NULL){
        if(p->val<p->next->val&&p->next->val>p->next->next->val){
            q->next = q->next->next;
            p = p->next;
        }
        else{
           p = p->next;
           q = q->next; 
        }
    }
    return head1;
}