# Definition for singly-linked list.
# class ListNode(object):
# def __init__(self, x):
# self.val = x
# self.next = None
class Solution(object):
def rotateRight(self, head, k):
"""
:type head: ListNode
:type k: int
:rtype: ListNode
"""
if head is None or head.next is None or k is 0: return head
n=1
curr=head
#find the length of the list n
while curr.next:
n+=1
curr=curr.next
if k%n==0: return head
#connect the tail with the head
curr.next=head
i=0
tail=head
#break the new tail and find head
while i <(n-k%n-1):
tail=tail.next
i+=1
head=tail.next
tail.next=None
return head
61. Rotate List
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