#248 Remove Nth Node From End of List

Author: forest000014

remove-nth-node-from-end-of-list/forest000014.java

@@ -0,0 +1,36 @@
+/*
+# Time Complexity: O(n)
+# Space Complexity: O(1)
+*/
+
+/**
+ * Definition for singly-linked list.
+ * public class ListNode {
+ *     int val;
+ *     ListNode next;
+ *     ListNode() {}
+ *     ListNode(int val) { this.val = val; }
+ *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
+ * }
+ */
+class Solution {
+    public ListNode removeNthFromEnd(ListNode head, int n) {
+        ListNode curr = head;
+        int cnt = 0;
+        while (curr != null) {
+            cnt++;
+            curr = curr.next;
+        }
+
+        if (cnt == n) { // 예외 처리
+            return head.next;
+        }
+
+        ListNode prev = null;
+        curr = head;
+        for (int i = 0; i < cnt - n; i++, prev = curr, curr = curr.next);
+        prev.next = curr.next; // 뒤에서 n번째 노드 제거
+
+        return head;
+    }
+}