BM9 删除链表的倒数第n个节点

bm/src/main/java/com/huangge1199/nowcoder/bm/BM9/Solution.java

@@ -0,0 +1,36 @@
+package com.huangge1199.nowcoder.bm.BM9;
+
+import com.huangge1199.nowcoder.common.ListNode;
+
+/**
+ * @author hyy
+ * @Classname Solution
+ * @Description BM9 删除链表的倒数第n个节点
+ * @Date 2022/8/4 17:06
+ */
+public class Solution {
+    public ListNode removeNthFromEnd(ListNode head, int n) {
+        // write code here
+        ListNode fast = head;
+        ListNode slow = head;
+        while (fast != null && n > 0) {
+            fast = fast.next;
+            n--;
+        }
+        if (fast == null) {
+            if (n == 0) {
+                return head.next;
+            }
+        } else {
+            while (fast != null) {
+                fast = fast.next;
+                if (fast == null) {
+                    slow.next = slow.next.next;
+                } else {
+                    slow = slow.next;
+                }
+            }
+        }
+        return head;
+    }
+}