Cod sursa(job #1819706)
Utilizator | Data | 30 noiembrie 2016 19:01:24 | |
---|---|---|---|
Problema | Ciurul lui Eratosthenes | Scor | 90 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.48 kb |
#include <bits/stdc++.h>
#define vb vector<bool>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long l;
l n;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
bool v[2000000];
void ciur()
{
l contor=0;
for( l i=2;i<=n;i++)
{
if(!v[i])
{
++contor;
for( l j=i*2;j<=n;j+=i) v[j]=1;
}
}
fout<<contor;
}
int main()
{
fin>>n;
ciur();
return 0;
}