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Adds solution for 23.Merge k Sorted Lists in Kotlin #822

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Merged
merged 1 commit into from
Aug 15, 2022
Merged

Adds solution for 23.Merge k Sorted Lists in Kotlin #822

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40 changes: 40 additions & 0 deletions kotlin/23-Merge-k-Sorted-Lists.kt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
package kotlin

class Solution{
fun mergeKLists(lists: Array<ListNode?>): ListNode? {
if (lists.isEmpty()) return null
var mergeInterval = 1
while (mergeInterval < lists.size) {
for (i in 0..lists.lastIndex step mergeInterval * 2) {
lists[i] = merge(lists[i], if (i + mergeInterval <= lists.lastIndex) lists[i + mergeInterval] else null)
}
mergeInterval *= 2
}
return lists[0]
}

private fun merge(l1: ListNode?, l2: ListNode?): ListNode? {
val dummyNode = ListNode(-1)
var currentNodeInList1 = l1
var currentNodeInList2 = l2
var currentNodeInResultantList:ListNode? = dummyNode

while(currentNodeInList1!=null && currentNodeInList2!=null){
if (currentNodeInList1.`val`>=currentNodeInList2.`val`){
currentNodeInResultantList?.next = currentNodeInList2
currentNodeInList2 = currentNodeInList2.next
}else{
currentNodeInResultantList?.next = currentNodeInList1
currentNodeInList1 = currentNodeInList1.next
}
currentNodeInResultantList = currentNodeInResultantList?.next
}

currentNodeInResultantList?.next = when{
currentNodeInList1!=null -> currentNodeInList1
currentNodeInList2!=null -> currentNodeInList2
else -> null
}
return dummyNode.next
}
}