2021-11-08

#include
int main()
{
int a[100000],temp,a1,a2,a3,n,i,sum;
scanf("%d",&n);
for(i=0;i {
scanf("%d",&a[i]);
}
if(a[n-1] {
temp=a[n-1];
a[n-1]=a[0];
a[0]=temp;
}

a1=a[n-1];
a3=a[0];
if(n%2==1)
	{
		a2=a[(n-1)/2];
		printf("%d %d %dn",a1,a2,a3);
	}
else
{
	sum=a[(n/2)-1]+a[n/2];
	if(sum%2==0)
		{
			a2=sum/2;
			printf("%d %d %dn",a1,a2,a3);
	}
	else
		printf("%d %.1f %dn",a1,sum/2.0,a3);
}

return 0;

}