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  1. #include <iostream>
  2. #include <set>
  3.  
  4. using namespace std;
  5.  
  6. struct Node{
  7.     int data;
  8.     Node* next;
  9. };
  10.  
  11. set<int> hashmap;
  12. Node* head = NULL;
  13.  
  14. void deldups()
  15. {
  16.     Node* prev = NULL;
  17.     Node* curr = head;
  18.  
  19.     while (curr != NULL)
  20.     {
  21.         int val = curr->data;
  22.         if (!hashmap.insert(val).second)
  23.         {
  24.             prev->next = curr->next;
  25.             delete curr;
  26.         }
  27.         else
  28.         {
  29.             prev = curr;
  30.         }
  31.         curr = prev->next;
  32.     }
  33. }
  34.  
  35. void print()
  36. {
  37.     Node* temp = head;
  38.     while (temp != NULL)
  39.     {
  40.         cout << temp->data << " ";
  41.         temp = temp->next;
  42.     }
  43.     cout << endl;
  44. }
  45.  
  46. int main() 
  47. {
  48.     Node* firstnode = new Node();
  49.     head = firstnode;
  50.     firstnode->data = 5;
  51.  
  52.     Node* secondnode = new Node();
  53.     firstnode->next = secondnode;
  54.     secondnode->data = 6;
  55.  
  56.     Node* thirdnode = new Node();
  57.     secondnode->next = thirdnode;
  58.     thirdnode->data = 7;
  59.  
  60.     Node* forthnode = new Node();
  61.     thirdnode->next = forthnode;
  62.     forthnode->data = 5;
  63.  
  64.     Node* fifthnode = new Node();
  65.     forthnode->next = fifthnode;
  66.     fifthnode->data = 9;
  67.     fifthnode->next = NULL;
  68.  
  69.     cout << "before: "; print();
  70.     deldups();
  71.     cout << "after: "; print();
  72.  
  73.     return 0;
  74. }
Success #stdin #stdout 0.01s 5456KB
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stdin
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Standard input is empty
stdout
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before: 5 6 7 5 9 
after: 5 6 7 9
https://ideone.com/CcVIrW
language:
C++ 4.3.2 (gcc-4.3.2)
created:
4 years ago
visibility:
public

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