题解 | #判断链表中是否有环#
判断链表中是否有环
https://www.nowcoder.com/practice/650474f313294468a4ded3ce0f7898b9
#include <stdbool.h>
/**
* struct ListNode {
* int val;
* struct ListNode *next;
* };
*/
/**
*
* @param head ListNode类
* @return bool布尔型
*/
bool hasCycle(struct ListNode* head ) {
// write code here
if(head == NULL) return false;
struct ListNode* s = head;
struct ListNode* f = head;
while(f->next != NULL && f->next->next != NULL) {
f = f->next->next;
s = s->next;
if(f == s) {
return true;
}
}
return false;
}