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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct DNode{
  5.     int data;
  6.     DNode* pPrev, *pNext;
  7. };
  8.  
  9. void insertAtBeginning(DNode* &pHead, int x);
  10. void insertB4K(DNode* &pHead, int x, int k);
  11.  
  12. //-----------------------------------------------------//
  13.  
  14. void insertAtBeginning(DNode* &pHead, int x) {
  15.     DNode* tmp = new DNode;
  16.     tmp->data = x;
  17.     tmp->pNext = pHead;
  18.     tmp->pPrev = nullptr;
  19.     if(pHead) pHead->pPrev = tmp;
  20.     pHead = tmp;
  21. }
  22.  
  23. //-----------------------------------------------------//
  24.  
  25. void insertB4K(DNode* &pHead, int x, int k) {
  26.     for(DNode* cur = pHead; cur != nullptr; cur = cur->pNext) {
  27.         if(cur->data == k) {
  28.             DNode* tmp = new DNode;
  29.             tmp->data = x;
  30.             tmp->pPrev = cur->pPrev;
  31.  
  32.             if(cur->pPrev) cur->pPrev->pNext = tmp;
  33.             else pHead = tmp;
  34.  
  35.             tmp->pNext = cur;
  36.             cur->pPrev = tmp;
  37.             break;
  38.         }
  39.     }
  40. }
  41.  
  42. //-----------------------------------------------------//
  43.  
  44. int main() {}
Success #stdin #stdout 0.01s 5460KB
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https://ideone.com/5ruPUt
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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