Cod sursa(job #679530)
| Utilizator |  Andreica Eric ericqw |
Data | 13 februarie 2012 13:39:50 |
|---|---|---|---|
| Problema | Ciurul lui Eratosthenes | Scor | 100 |
| Compilator | cpp | Status | done |
| Runda | Arhiva educationala | Marime | 0.23 kb |
#include<fstream>
using namespace std;long long i,n,j,c;bool v[2000002];int main(){ifstream f("ciur.in");ofstream g("ciur.out"); f>>n;for (i=2;i<=n;i++)v[i]=1;for (i=2;i<=n;i++)if (v[i]==1){c++;for(j=i+i;j<=n;j=j+i)v[j]=0;}g<<c;return 0;}