Reverse Linked List

Author: TonyKim9401

reverse-linked-list/TonyKim9401.java

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+// TC: O(n)
+// -> visit all elements of head
+// SC: O(1)
+// -> constant space complexity
+class Solution {
+    public ListNode reverseList(ListNode head) {
+        ListNode node = null;
+        while (head != null) {
+            ListNode temp = head.next;
+            head.next = node;
+            node = head;
+            head = temp;
+        }
+        return node;
+    }
+}