Cod sursa(job #1277791)

Utilizator floryn5Lungu Florin floryn5 Data 28 noiembrie 2014 09:30:32
Problema Fractii Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.34 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
int t[1000001];

int main()
{int i,j,n;
long long k;
ifstream f("fractii.in");
ofstream g("fractii.out");

f>>n;

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

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