Cod sursa(job #1534289)

Utilizator UpinfoDaniel Upinfo Data 23 noiembrie 2015 17:12:01
Problema Fractii Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include<fstream>



using namespace std;

ifstream f;
ofstream g;

long int i,j,n;

long long t[1000002],k;

int main()
{
f.open("fractii.in");
g.open("fractii.out");

f>>n;

k=0;
for(i=2;i<=n;i++)
        {
        t+=i-1;
        for(j=i+i;j<=n;j+=i)t[j]-=t;
        k+=t;
        }

g<<k*2+1;
g.close();
}