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  1. /*
  2. Median of a Sorted Linked List
  3. Given a sorted singly list of integers, return the median value.
  4. Example
  5. Input: 1 ⇒ 3 ⇒ 4 ⇒ 5 ⇒ 6 ⇒ 6 ⇒ 9
  6. Output: 5
  7.  
  8. Input: 1 ⇒ 3 ⇒ 4 ⇒ 5 ⇒ 6 ⇒ 6 ⇒ 8 ⇒ 9
  9. Output: 5.5
  10.  
  11.  
  12. */
  13.  
  14. // time complexity = O(n);
  15. // space complexity = O(1);
  16.  
  17. #include <iostream>
  18. using namespace std;
  19.  
  20. struct Node{
  21. 	int data;
  22. 	Node* next;
  23. 	Node(int x) : data(x) , next(NULL) {}
  24. };
  25.  
  26. void insert(Node*& head , int val){
  27. 	if(!head){
  28. 		head = new Node(val);
  29. 		return;
  30. 	}
  31.  
  32. 	Node* temp = head;
  33. 	while(temp->next){
  34. 		temp = temp->next;
  35. 	}
  36. 	temp->next = new Node(val);
  37. }
  38.  
  39. double findmedian(Node* head){
  40. 	Node* slow = head;
  41. 	Node* fast = head;
  42. 	Node* prev = NULL;
  43.  
  44. 	while(fast && fast->next){
  45. 		prev = slow;
  46. 		slow = slow->next;
  47. 		fast = fast->next->next;
  48. 	}
  49.  
  50. 	if(fast == NULL){
  51. 		return double((prev->data + slow->data) / 2.0);
  52. 	}
  53.  
  54. 	return slow->data;
  55. }
  56. int main() {
  57.  
  58. 	Node* head = NULL;
  59.  
  60. 	int arr[]={1};
  61. 	int n = sizeof(arr) / sizeof(arr[0]);
  62.  
  63. 	for(int i = 0 ; i<n ; i++){
  64. 		insert(head,arr[i]);
  65. 	}
  66. 	cout<<"Median is :"<< findmedian(head);
  67. 	return 0;
  68. }
Success #stdin #stdout 0s 5312KB
comments (?)
stdin 
Standard input is empty
stdout 
Median is :1
https://ideone.com/MyPZPJ
language:
C++14 (gcc 8.3)
created:
3 hours ago
visibility:
public

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