Cod sursa(job #998919)
| Utilizator |  andrei contor andreicontor |
Data | 18 septembrie 2013 19:15:13 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 30 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.26 kb |
#include <fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
long long i,j,n,nr,v[200001];
int main()
{f>>n;
for(i=2;i<=n;i++)
v[i]=1;
for(i=2;i<=n;i++)
if(v[i]==1)
{nr++;
for(j=2*i;j<=n;j=j+i)
v[j]=0;
}
g<<nr;
return 0;
}
