题解 | #链表中倒数最后k个结点#

/**
 * 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 pHead ListNode类
 * @param k int整型
 * @return ListNode类
 */
struct ListNode* FindKthToTail(struct ListNode* pHead, int k ) {
    // write code here
    if (pHead == NULL)
        return NULL;
    struct ListNode* front = pHead;
    struct ListNode* rear = pHead;
    for (int i = 0; i < k; i++) {
        if (front != NULL)
            front = front->next;
        else
            return NULL;
    }
    while (front != NULL) {
        front = front->next;
        rear = rear->next;
    }
    return rear;
}