面试题 02.02. 返回倒数第 k 个节点 - 力扣（LeetCode）( 点击前面链接即可查看题目)
/*** Definition for singly-linked list.* struct ListNode {* int val;* struct ListNode *next;* };*/int kthToLast(struct ListNode* head, int k)
{struct ListNode* fastnode = head;struct ListNode* slownode = head;while(k--){fastnode = fastnode->next;}while(fastnode){fastnode = fastnode->next;slownode = slownode->next;}return slownode->val;
}