diff --git a/typescript/19-Remove-Nth-Node-From-End-of-List.ts b/typescript/19-Remove-Nth-Node-From-End-of-List.ts
index c9e2b6400..24268c9fb 100644
--- a/typescript/19-Remove-Nth-Node-From-End-of-List.ts
+++ b/typescript/19-Remove-Nth-Node-From-End-of-List.ts
@@ -11,25 +11,21 @@
*/
function removeNthFromEnd(head: ListNode | null, n: number): ListNode | null {
- let dummyList: ListNode = new ListNode(0)
- dummyList.next = head
- let count: number = 0
- let first: ListNode = dummyList
- let second: ListNode = dummyList
-
- while (count < n) {
- second = second.next
- count++
- }
- if (second === null) {
- dummyList.val = dummyList.next.val
- dummyList.next = dummyList.next.next
- }
- while (second.next !== null) {
- second = second.next
- first = first.next
- }
- first.next = first.next.next
-
- return dummyList.next
-}
+ let dummy: ListNode = new ListNode(0, head)
+ let left = dummy
+ let right = head
+
+ while (n > 0) {
+ right = right.next
+ n -= 1
+ }
+
+ while (right) {
+ left = left.next
+ right = right.next
+ }
+
+ // delete
+ left.next = left.next.next
+ return dummy.next
+};
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