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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.       head=new node;
  14.       head->i=10;
  15.       a=head;
  16.       for(int j=0;j<9;j++)
  17.        { 
  18.            node *ptr=new node;
  19.           // cout<<"\n enter value :";
  20.            cin>>ptr->i;
  21.            a->nxt=ptr;
  22.            a=ptr;
  23.        }
  24.        a->nxt=NULL;
  25.        a=head;
  26.        cout<<"\n before....";
  27.        for(int j=0;j<9;j++)
  28.         {
  29.             cout<<a->i<<"->";
  30.             a=a->nxt;
  31.         }
  32.         cout<<"\n after...";
  33.         node *s,*t,*u;
  34.         a=head;
  35.         head=(a->nxt)->nxt;
  36.         while(a!=NULL)
  37.          {
  38.              u=a->nxt;
  39.              s=(a->nxt)->nxt;
  40.              if(a==NULL||u==NULL||s==NULL)
  41.                break;
  42.              t=s->nxt;
  43.              s->nxt=u;
  44.              u->nxt=a;
  45.              a->nxt=t;
  46.              a=t;
  47.  
  48.          };
  49.          a=head;
  50.          for(int j=0;j<9;j++)
  51.         {
  52.             cout<<a->i<<"->";
  53.             a=a->nxt;
  54.         }
  55.       return 0;
  56.   }
Runtime error #stdin #stdout 0s 2988KB
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stdin
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stdout
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Standard output is empty
https://ideone.com/C1C1qy
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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