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0061-rotate-list.java

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//TC: O(n) + O(n- (n % k)) ~ O(n)

//SC: O(1)

class Solution {

public ListNode rotateRight(ListNode head, int k) {

if (head == null || head.next == null || k == 0)

return head;

int l = 1; // length of list

ListNode temp = head;

// calculate the list's length

while (temp.next != null) {

l++;

temp = temp.next;

}

temp.next = head; // make the list cyclic

k = k % l; // handles the case where k>l

k = l - k;

while (k > 0) {

temp = temp.next;

k--;

}

head = temp.next;

temp.next = null;

return head;

}

}