Create 2807-insert-greatest-common-divisors-in-linked-list.js

Author: everthis

2807-insert-greatest-common-divisors-in-linked-list.js

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+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @return {ListNode}
+ */
+const insertGreatestCommonDivisors = function(head) {
+  const dummy = new ListNode()
+  
+  dummy.next = head
+  let cur = head
+  while(cur.next) {
+    const val = gcd(cur.val, cur.next.val)
+    const tmp = new ListNode(val)
+    const nxt = cur.next
+    cur.next = tmp
+    tmp.next = nxt
+    
+    cur = nxt
+  }
+  
+  return dummy.next
+  
+  function gcd(a, b) {
+    return b === 0 ? a : gcd(b, a % b)
+  }
+};