remove nth node from end of list solution

Author: hyer0705

remove-nth-node-from-end-of-list/hyer0705.ts

@@ -0,0 +1,34 @@
+/**
+ * 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)
+ *     }
+ * }
+ */
+
+function removeNthFromEnd(head: ListNode | null, n: number): ListNode | null {
+  if (!head) return null;
+
+  let current = head;
+  let nodeLen = 0;
+  while (current.next) {
+    current = current.next;
+    nodeLen++;
+  }
+
+  if (nodeLen - n < 0) return head.next;
+
+  current = head;
+  let count = 0;
+  while (count < nodeLen - n) {
+    current = current.next;
+    count++;
+  }
+  current.next = current.next.next;
+
+  return head;
+}