Cod sursa(job #1932633)
Utilizator | Clodnischi Darian Antonio darian2001 | Data | 19 martie 2017 22:28:10 |
---|---|---|---|
Problema | Ciurul lui Eratosthenes | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.26 kb |
#include<fstream>
ifstream fin("ciur.in");
ofstream fout("ciur.out");
using namespace std;
int n,i,j,nr;
char p[2000011];
int main()
{ fin>>n;
for(i=2; i<=n; i++)
if(!p[i])
{ nr++; for(j=i+i; j<=n; j+=i) p[j]=1;}
fout<<nr<<'\n';