Cod sursa(job #2368624)
| Utilizator |  Adrian Capraru aditzu7 |
Data | 5 martie 2019 16:47:50 |
|---|---|---|---|
| Problema | Fractii | Scor | 100 |
| Compilator | cpp-64 | Status | done |
| Runda | Arhiva de probleme | Marime | 0.28 kb |
#include <fstream>
using namespace std;ifstream f("fractii.in");ofstream g("fractii.out");int din[1001*1001];long long n,i,j,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;}
