Leetcode—142.环形链表II【中等】

2023每日刷题（三十三）

Leetcode---142.环形链表II

实现代码

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     struct ListNode *next;
 * };
 */
struct ListNode *detectCycle(struct ListNode *head) {
    struct ListNode* fast = head, *slow = head;
    while(1) {
        if(fast == NULL || fast->next == NULL) {
            return NULL;
        }
        fast = fast->next->next;
        slow = slow->next;
        if(slow == fast) {
            break;
        }
    }
    fast = head;
    while(slow != fast) {
        fast = fast->next;
        slow = slow->next;
    }
    return fast;
}

运行结果

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