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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class linklist
  5. {
  6.     struct Node
  7.     {
  8.         int data;
  9.         Node*next;
  10.  
  11.     Node(int data,Node*ptr)
  12.     {
  13.         this->data=data;
  14.         next=ptr;
  15.     }
  16.     Node(int data)
  17.     {
  18.         this->data=data;
  19.         next=0;
  20.     }
  21.     };
  22.     Node*head=nullptr;
  23.     Node*tail=nullptr;
  24. void insertfirst(int val)
  25. {
  26. Node*nn=new Node(val,head);
  27. head=nn;
  28. if(tail==0)tail=nn;
  29. }
  30. void insertlast(int val)
  31. {
  32.     if(head==0)
  33.     {
  34.         insertfirst(val);
  35.     }
  36. Node*nn=new Node(val);
  37. tail->next=nn;
  38. tail=nn;
  39. }
  40. int size=0;
  41. public:
  42. void insert(int val,int pos)
  43. {
  44.     size++;
  45.     if(pos==1){
  46.     insertfirst(val);
  47.     return;}
  48.     else if(pos==size)
  49.     {
  50.         insertlast(val);
  51.         return;
  52.     }
  53.     Node*prev=head;
  54.     for(int i=0;i<pos-2;i++)
  55.     {
  56.         prev=prev->next;
  57.     }
  58.     Node*nn=new Node(val,prev->next);
  59.     prev->next=nn;
  60. }
  61. void delvalue(int pos)
  62. {
  63.     if(pos < 1 || pos > size)
  64.     {
  65.         cout << "Invalid position!" << endl;
  66.         return;
  67.     }
  68.  
  69.     if(pos == 1) 
  70.     {
  71.         Node* temp = head;      
  72.         head = head->next;     
  73.         if(head == nullptr) 
  74.             tail = nullptr;     
  75.         delete temp;           
  76.     }
  77.     else 
  78.     {
  79.         Node* prev = head;
  80.  
  81.         for(int i = 1; i < pos - 1; i++)
  82.         {
  83.             prev = prev->next;
  84.         }
  85.  
  86.         Node* temp = prev->next;    
  87.         prev->next = temp->next;    
  88.  
  89.         if(temp == tail)           
  90.             tail = prev;           
  91.  
  92.         delete temp;               
  93.     }
  94.     size--;
  95. }
  96. void display()
  97. {
  98.     Node*ptr=head;
  99.     while(ptr!=0)
  100.     {
  101.         cout<<ptr->data<<" ";
  102.         ptr=ptr->next;
  103.     }
  104.     cout<<endl;
  105. }
  106. };
  107.  
  108. int main()
  109. {
  110. linklist l1,l2;
  111. l1.insert(100,1);
  112. l1.insert(200,1);
  113. l1.insert(300,2);
  114. l1.display();
  115. l1.delvalue(2);
  116. l1.display();
  117.     return 0;
  118.  
  119. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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200 300 100 
200 100
https://ideone.com/dEedya
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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