here is my c++ code:
#include <iostream.h>
int main()
{
int n,i,j,x[501],z[501],aux,max,V[501],L[501],k,poz;
     cin>>n;
     for(i=1;i<=501;i++)
            z[i]=i;
     for(i=1;i<=n;i++)
     cin>>x[i]>>V[i];
     if(n>1)
     {
     for(i=1;i<=n-1;i++)
        for(j=i+1;j<=n;j++)
             if(x[i]<x[j])
                     {
                          aux=x[i];
                          x[i]=x[j];
                          x[j]=aux;
                          aux=V[i];
                          V[i]=V[j];
                          V[j]=aux;
                          aux=z[i];
                          z[i]=z[j];
                          z[j]=aux;
                     }

  }
  L[n]=1;
  for (k=n-1;k>=1;k--)
  { max=0;
     for (i=k+1;i<=n;i++)
        if ((V[i]>V[k])&&(L[i]>max))
    max=L[i];
         L[k]=max+1;
  }
 max=L[1];
 poz=1;
 for (k=1;k<=n;k++)
    if (L[k]>max)
      { max=L[k];
         poz=k;
      }
  cout<<max<<endl;
  cout<<z[poz]<<" ";
  for (i=poz+1;i<=n;i++)
     if ((V[i]>V[poz])&&(L[i]==max-1))
      { cout<<z[i]<<" ";
         max--;
      }
  return 0;
}