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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct Node{
  5.     int data;
  6.     Node* pNext;
  7. };
  8.  
  9. void insertAtBeginning(Node* &pHead, int x);
  10. void insertAfterK(Node* pHead, int x, int k);
  11. void insertBeforeK(Node* &pHead, int x, int k);
  12.  
  13. //-----------------------------------------------------//
  14.  
  15. void insertAtBeginning(Node* &pHead, int x) {
  16.     Node* newNode = new Node;
  17.     newNode->data = x;
  18.     newNode->pNext = pHead;
  19.     pHead = newNode;
  20. }
  21.  
  22. //-----------------------------------------------------//
  23.  
  24. void insertAfterK(Node* pHead, int x, int k) {
  25.     while(pHead != nullptr && pHead->data != k)
  26.         pHead = pHead->pNext;
  27.  
  28.     if(pHead == nullptr) return;
  29.  
  30.     Node* newNode = new Node;
  31.     newNode->data = x;
  32.     newNode->pNext = pHead->pNext;
  33.     pHead->pNext = newNode;
  34. }
  35.  
  36. //-----------------------------------------------------//
  37.  
  38. void insertBeforeK(Node*& pHead, int x, int k) {
  39.     if(!pHead) return;
  40.  
  41.     Node* cur = pHead;
  42.     if(cur->data == k) {
  43.         insertAtBeginning(pHead, x);
  44.         return;
  45.     }
  46.  
  47.     while(cur && cur->pNext && cur->pNext->data != k) {
  48.         cur = cur->pNext;
  49.     }
  50.  
  51.     if(!cur->pNext) return;
  52.  
  53.     Node* newNode = new Node;
  54.     newNode->data = x;
  55.     newNode->pNext = cur->pNext;
  56.     cur->pNext = newNode;
  57. }
  58.  
  59. //-----------------------------------------------------//
  60.  
  61. int main() {}
Success #stdin #stdout 0.01s 5424KB
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https://ideone.com/xwFzC5
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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