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Linked List Cycle - Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer. Internally, pos is used to denote the index of the node that tail's next pointer is connected to.
142. Linked List Cycle II. Medium. Given the head of a linked list, return the node where the cycle begins. If there is no cycle, return null. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer.
class Solution { public: bool hasCycle(ListNode* head) { ListNode* slow = head; ListNode* fast = head; while (fast != nullptr && fast->next != nullptr) { slow = slow->next; fast = fast->next->next; if (slow == fast) return true; } return false; } }; 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15.
Apr 19, 2016 · 141. Linked List Cycle Description. Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer.
Linked List Cycle is a Leetcode easy level problem. Let’s see the code, 141. Linked List Cycle – Leetcode Solution. Table of Contents. Problem. Given head, the head of a linked list, determine if the linked list has a cycle in it.
Sep 30, 2020 · 141. Linked List Cycle. Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can...
141. Linked List Cycle. Description. Given head, the head of a linked list, determine if the linked list has a cycle in it. There is a cycle in a linked list if there is some node in the list that can be reached again by continuously following the next pointer.
Oct 28, 2023 · 141. Linked List Cycle. Given a linked list, determine if it has a cycle in it. To represent a cycle in the given linked list, we use an integer pos which represents the position (0-indexed) in the linked list where tail connects to. If pos is -1, then there is no cycle in the linked list.
Jan 20, 2022 · LeetCode 141. Linked List Cycle (Easy) [ link] Iterate through all nodes and determine whether this node is visited before. We use HashTable to store the nodes visited. Set is sufficient to store the information about whether a node is visited. Time complexity O (n), space complexity O (n). class Solution(object): def hasCycle(self, head): """
141. Linked List Cycle. Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? use hash map to save node. Two pointers with different speed. /** * Definition for singly-linked list.
