-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathLeetcode141.cpp
More file actions
67 lines (55 loc) · 1.75 KB
/
Leetcode141.cpp
File metadata and controls
67 lines (55 loc) · 1.75 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
// Leetcode141.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
// bool hasCycle(ListNode *head) {
// unordered_set<ListNode*> setList;
// ListNode *temp = head;
// while(temp!=NULL)
// {
// if(setList.find(temp)!=setList.end())
// {
// return true;
// }
// else
// setList.insert(temp);
// temp = temp->next;
// }
// return false;
// }
bool hasCycle(ListNode* head) {
ListNode* p1 = head;
ListNode* p2 = NULL;
if (head != NULL && head->next != NULL)
p2 = head->next->next;
while (p1 != NULL && p2 != NULL)
{
if (p1 == p2) return true;
p1 = p1->next;
if (p2->next != NULL)
p2 = p2->next->next;
else
p2 = NULL;
}
return false;
}
int main()
{
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file