Cod sursa(job #2368609)
| Utilizator |  Adrian Capraru aditzu7 |
Data | 5 martie 2019 16:45:07 |
|---|---|---|---|
| Problema | Fractii | Scor | 100 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva de probleme | Marime | 0.32 kb |
#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int din[1001*1001];
int n,i,j;
long long ssol;
int main()
{
f>>n;
for(i=1;i<=n;i++) din[i]=i-1;
for(i=2;i<=n/2;i++)
for (j=2*i;j<=n;j+=i) din[j]-=din[i];
for(i=1;i<=n;i++) ssol+=din[i];
g<<ssol*2+1<<'\n';
return 0;
}
