From c7db4daae01e59ae4422c43c0dd20b56c991408f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tasha=28=EC=82=B4=EB=AF=B8=29?=
 <45252527+Lustellz@users.noreply.github.com>
Date: Sat, 20 Sep 2025 15:06:05 +0900
Subject: [PATCH] solution on linked-list-cycle

---
 linked-list-cycle/Lustellz.ts | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 linked-list-cycle/Lustellz.ts

diff --git a/linked-list-cycle/Lustellz.ts b/linked-list-cycle/Lustellz.ts
new file mode 100644
index 000000000..4c7a7366e
--- /dev/null
+++ b/linked-list-cycle/Lustellz.ts
@@ -0,0 +1,29 @@
+/**
+ * Definition for singly-linked list.
+ * class ListNode {
+ *     val: number
+ *     next: ListNode | null
+ *     constructor(val?: number, next?: ListNode | null) {
+ *         this.val = (val===undefined ? 0 : val)
+ *         this.next = (next===undefined ? null : next)
+ *     }
+ * }
+ */
+
+// Runtime: 49ms
+// Memory: 56.94MB
+
+function hasCycle(head: ListNode | null): boolean {
+  let fast: ListNode = head;
+  let slow: ListNode = head;
+
+  while (fast && fast.next) {
+      fast = fast.next.next;
+      slow = slow!.next;
+
+      if (fast === slow) {
+          return true;
+      }
+  }
+  return false;
+}