Cod sursa(job #2391266)

Utilizator mateibucurMatei Bucur mateibucur Data 28 martie 2019 18:55:49
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream in("ciur.in");
ofstream out("ciur.out");
bool v[2000001];
int main()
{
    int i,m,cnt=0,n;
    in>>n;
    for(i=2;i<=n;i++){
    if(v[i]==0) {cnt++;
            for(m=2*i;m<=n;m=m+i)
            v[m]=1;
    }}
    out<<cnt;
    return 0;
}