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  1. #include <iostream>
  2. using namespace std;
  3. #include <cstdio> 
  4.  
  5. struct node
  6.  {
  7.      int i;
  8.      node * nxt;
  9.  }*head,*a;
  10.  int main()
  11.   {
  12.       int n;
  13.      // cout<<"yes";
  14.       head=new node;
  15.       head->i=10;
  16.       a=head;
  17.       for(int j=0;j<9;j++)
  18.        { 
  19.            node *ptr=new node;
  20.           // cout<<"\n enter value :";
  21.            cin>>ptr->i;
  22.            a->nxt=ptr;
  23.            a=ptr;
  24.        }
  25.        a->nxt=NULL;
  26.        a=head;
  27.        cout<<"\n before....";
  28.        for(int j=0;j<10;j++)
  29.         {
  30.             cout<<a->i<<"->";
  31.             a=a->nxt;
  32.         }
  33.         cout<<"\n after...";
  34.         node *s,*t,*u;
  35.         a=head;
  36.         while(a->nxt!=NULL)
  37.          {
  38.             // cout<<"yes";
  39.              u=a->nxt;
  40.              //cout<<"yes";
  41.              s=(a->nxt)->nxt;
  42.              if(a==NULL||u==NULL||s==NULL)
  43.                break;
  44.              t=s->nxt;
  45.              //cout<<u->i<<s->i<<t->i<<endl;
  46.              a->nxt=t;
  47.              u->nxt=t->nxt;
  48.              t->nxt=s;
  49.              s->nxt=u;
  50.              a->nxt=t;
  51.              a=u;
  52.              //cout<<u->i<<s->i<<t->i<<endl;
  53.  
  54.          };
  55.          a=head;
  56.         while(a!=NULL)
  57.         {
  58.             cout<<a->i<<"->";
  59.             a=a->nxt;
  60.         }
  61.       cin>>n;
  62.   }
  63.  
Success #stdin #stdout 0s 2988KB
comments (?)
stdin
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1 2 3 4 5 6 7 8 9
stdout
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 before....10->1->2->3->4->5->6->7->8->9->
 after...10->3->2->1->6->5->4->9->8->7->
https://ideone.com/8eg04W
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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