
让快指针和慢指针保持相同的距离
public ListNode getKthFromEnd(ListNode head, int k) {
ListNode fast = head;
while (fast != null && k > 0) {
fast = fast.next;
k--;
}
ListNode slow = head;
while (fast != null) {
fast = fast.next;
slow = slow.next;
}
return slow;
}
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