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45 changes: 45 additions & 0 deletions Data-Structures/Linked-List/RotateListRight.js
Original file line number Diff line number Diff line change
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/**
* A LinkedList based solution for Rotating a List to the right by k places
*/

function main () {
/*
Problem Statement:
Given a linked list, rotate the list to the right by k places, where k is non-negative.

Note:
* While Solving the problem in given link below, don't use main() function.
* Just use only the code inside main() function.
* The purpose of using main() function here is to aviod global variables.

Link for the Problem: https://leetcode.com/problems/rotate-list/
*/
// Reference to both head and k is given in the problem. So please ignore below two lines
let head = ''
let k = ''
let i = 0
let current = head
while (current) {
i++
current = current.next
}
k %= i
current = head
let prev = null
while (k--) {
if (!current || !current.next) {
return current
} else {
while (current.next) {
prev = current
current = current.next
}
prev.next = current.next
current.next = head
head = current
}
}
return head
}

main()