feat: linked-list-cycle

Author: minji-go

linked-list-cycle/minji-go.java

@@ -0,0 +1,27 @@
+/**
+ * <a href="https://leetcode.com/problems/linked-list-cycle/">week9-1. linked-list-cycle</a>
+ * <li>Description: Return true if there is a cycle in the linked list. </li>
+ * <li>Topics: Hash Table, Linked List, Two Pointers</li>
+ * <li>Time Complexity: O(N), Runtime 0ms   </li>
+ * <li>Space Complexity: O(1), Memory 44.37MB</li>
+ */
+public class Solution {
+    public boolean hasCycle(ListNode head) {
+        if (head == null) {
+            return false;
+        }
+
+        ListNode slow = head;
+        ListNode fast = head.next;
+
+        while (slow != fast) {
+            if (fast == null || fast.next == null) {
+                return false;
+            }
+            slow = slow.next;
+            fast = fast.next.next;
+        }
+
+        return true;
+    }
+}