'''/** Definition for singly-linked list. struct ListNode { int val; ListNode *next; ListNode(int x) : val(x), next(NULL) {} }; /class Solution {public: bool hasCycle(ListNode *head) { set<ListNode*>s; while(head){ if(s.find(head)!=s.end()){ return true; } s.insert(head); head=head->next;...
