题解 | #删除链表的倒数第n个节点#

/**
 * 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 
 * @param n int整型 
 * @return ListNode类
 */
#include <stdlib.h>
struct ListNode* removeNthFromEnd(struct ListNode* head, int n ) {
    // write code here
    struct ListNode* h = (struct ListNode*)malloc(sizeof(struct ListNode));
    h->next = head;
    struct ListNode* p = head;
    struct ListNode* q = h;
    for(int i = 0;i < n;i++)
    {
        p = p->next;
    }
    while(p)
    {
        p = p->next;
        q = q->next;
    }
    p = q->next->next;
    if(q->next->next)
        q->next->next = NULL;
    q->next = p;
    return h->next;
}