Cod sursa(job #570666)
Utilizator | Data | 3 aprilie 2011 13:55:38 | |
---|---|---|---|
Problema | Ciurul lui Eratosthenes | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.23 kb |
#include<fstream.h>
int N,i,j,nr,a[2000001];
int main()
{
ifstream f("eratostene.in");
ofstream g("eratostene.out");
f>>N;
for(i=2;i<=N;i++)
{if(!a[i])
{nr++;
for(j=i*i;j<=N;j+=i)
a[j]=1;
}
}
g<<nr;
return 0;
}