Create 1669-merge-in-between-linked-lists.kt

Author: a93a

Diff for: kotlin/1669-merge-in-between-linked-lists.kt

@@ -0,0 +1,23 @@
+class Solution {
+    fun mergeInBetween(list1: ListNode?, a: Int, b: Int, list2: ListNode?): ListNode? {
+        var curr = list1
+        var i = 0
+        while (i < a - 1) {
+            curr = curr?.next
+            i++
+        }
+
+        var head = curr
+        while (i <= b) {
+            curr = curr?.next
+            i++
+        }
+        head?.next = list2
+
+        var list2 = list2
+        while (list2?.next != null)
+            list2 = list2?.next
+        list2?.next = curr
+        return list1
+    }
+}