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* head1,*head2;
head1=head2=head;
do{
if((head2!=NULL)&&(head2->next!=NULL)){
head2=head2->next->next;
}else return false;
head1=head1->next;
}while(head1!=head2);
return true;
}
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