Cod sursa(job #1755441)
Utilizator | Data | 10 septembrie 2016 11:00:21 | |
---|---|---|---|
Problema | Ciurul lui Eratosthenes | Scor | 30 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.39 kb |
#include <fstream>
using namespace std;
int v[2000001];
ifstream cin("ciur.in");
ofstream cout("ciur.out");
int main()
{
int n,s=0,k=0,i=2;
cin>>n;
while(i<=n)
{
if(v[i]==0)
{k=0;
s++;
while(i*k<=n)
{
v[i*k]=1;
k++;
}
}i++;
}cout<<s;
return 0;
}