Cod sursa(job #2143365)
| Utilizator |  Roman Marius roman |
Data | 25 februarie 2018 21:04:01 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 90 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.21 kb |
#include<fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
int main()
{int i,j,n,r=0;
char a[2000000];f>>n;
for(i=2;i<=n;i++)
{if(!a[i]){r++;
for(j=2*i;j<=n;j+=i)
a[j]=1;}}g<<r;
}
