#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>


main()
	{
	const int n= 7 ;
	int r[n],i,i1,i2,nt;
/*******************************************/
	srand( (unsigned)time( NULL ) );
	for(i= 0 ; i<n; ++i) r[i] = i;

	for(i= 0 ; i<n; ++i)
		{
		i1=rand()%n;
		i2=rand()%n;
		nt = r[i1];
		r[i1]=r[i2];
		r[i2]=nt;
		}
/*******************************************/
	for(i= 0 ; i<n; ++i)
		{
		printf(" %d ",r[i]);
		}
	return  0 ;
	}

for(i= 0 ; i< 2 *n; ++i)
		{
		i1=rand()%n;
		i2=rand()%n;
		nt = r[i1];
		r[i1]=r[i2];
		r[i2]=nt;
		}