Cod sursa(job #120523)

Utilizator ciprianfFarcasanu Alexandru Ciprian ciprianf Data 5 ianuarie 2008 20:08:25
Problema Sum Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.49 kb
#include <fstream.h>
using namespace std;
long long u[100001],tot[100001];
void totient()
	{
long i,j;
	for (i=2;i<=100001;i++)
		tot[i]=i;
	for (i=2;i<=100001;i++)
		{
		if (u[i]==0)
			{
			j=1;
			while(i*j<=100001)
				{
				u[i*j]=1;
				tot[i*j]=tot[i*j]-(tot[i*j]/i);
				j++;
			}	}
		}
	}
int main()
{ long long n,sol;
totient();
ifstream f1("sum.in");
ofstream f2("sum.out");
f1>>n;
for (i=1;i<=n;i++)
	{
	f1>>x;
	sol=2*n*tot[n];
	f2<<sol;
	}
return 0;
}