Cod sursa(job #1687242)
Utilizator | Data | 12 aprilie 2016 18:54:06 | |
---|---|---|---|
Problema | Ciurul lui Eratosthenes | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.45 kb |
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
#include<fstream>
using namespace std;
int n,c=0;
bool v[2000050];
int main()
{
ifstream cin("ciur.in");
ofstream cout("ciur.out");
cin>>n;
for(int i=2;i<=n;++i)
{
if(v[i]==0)
{
c++;
for(int j=i*2;j<=n;j+=i)
{
v[j]=1;
}
}
}
cout<<c;
}