Cod sursa(job #742722)
| Utilizator |  Aiordachioaei Marius Flameingo |
Data | 1 mai 2012 09:35:24 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 0 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.25 kb |
#include<ifstream>
using namespace std;
bool c[9000001];
int main()
{
ifstream cin("ciur.in");ofstream cout("ciur.out");
int n,i,j,s=1;
cin>>n;
for(i=3;i<=n;i+=2)
{
if(!c[i])
s++;
for(j=i+i;j<=n;j+=i)
c[j]=1;
}
cout<<s;
}