Problems
LinkedList Cycle length
LinkedList Cycle length
Given a linked list. Find the length of its cycle. If there is no cycle, return -1.
Definition of a single linked list:
// Java
class ListNode {
int val;
ListNode next;
ListNode(int x) {
val = x;
next = null;
}
}
// C++
class ListNode
{
public:
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
// C
struct ListNode
{
int val;
struct ListNode *next;
};
Implement a function CycleLength that returns a length of a cycle. If there is no cycle, return -1.
// Java
int CycleLength(ListNode head)
// C, C++
int CycleLength(ListNode *head)
Example
Function CycleLength returns -1 because this linked list does not contain a cycle.
Function CycleLength returns 3 - the length of the cycle (3 → 4 → 5 → 3).