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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct SinglyLinkedListNode {
  5.     int data;
  6.     SinglyLinkedListNode* next;
  7.  
  8.     SinglyLinkedListNode(int node_data) {
  9.         data = node_data;
  10.         next = nullptr;
  11.     }
  12. };
  13.  
  14. SinglyLinkedListNode* insertNodeAtPosition(SinglyLinkedListNode* head, int data, int position) {
  15.     SinglyLinkedListNode* newNode = new SinglyLinkedListNode(data);
  16.  
  17.     if (position == 0) {
  18.         newNode->next = head;
  19.         return newNode;
  20.     }
  21.  
  22.     SinglyLinkedListNode* current = head;
  23.     for (int i = 0; i < position - 1 && current; i++) {
  24.         current = current->next;
  25.     }
  26.  
  27.     if (current) {
  28.         newNode->next = current->next;
  29.         current->next = newNode;
  30.     }
  31.  
  32.     return head;
  33. }
  34.  
  35. void printList(SinglyLinkedListNode* head) {
  36.     while (head) {
  37.         cout << head->data << " ";
  38.         head = head->next;
  39.     }
  40.     cout << endl;
  41. }
  42.  
  43. int main() {
  44.     SinglyLinkedListNode* head = nullptr;
  45.  
  46.     head = insertNodeAtPosition(head, 10, 0); 
  47.     head = insertNodeAtPosition(head, 20, 1);
  48.     head = insertNodeAtPosition(head, 30, 2);
  49.     head = insertNodeAtPosition(head, 25, 2);
  50.  
  51.     printList(head); 
  52.  
  53.     return 0;
  54. }
  55.  
Success #stdin #stdout 0.01s 5296KB
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Standard input is empty
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10 20 25 30
https://ideone.com/pvhDGe
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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