Time: 56 ms (58.72%) | Memory: 50.9 MB (15.73%) - LeetSync

19-remove-nth-node-from-end-of-list/remove-nth-node-from-end-of-list.js

@@ -0,0 +1,36 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @param {number} n
+ * @return {ListNode}
+ */
+var removeNthFromEnd = function(head, n) {
+    // Create a dummy node to handle cases where the head is removed
+    const dum = new ListNode(0);
+    dum.next = head;
+
+    // Initialize two pointers: first and second
+    let first = dum;
+    let scnd = dum;
+
+    // Move the first pointer n nodes ahead of the second pointer
+    for ( let i = 0; i < n + 1; i++){
+        first = first.next;
+    }
+    while(first !== null){
+        first = first.next;
+        scnd = scnd.next;
+    }
+
+    // Remove the nth node from the end by adjusting pointers
+    scnd.next = scnd.next.next;
+
+    // Return the head of the modified linked list
+    return dum.next;
+};