Cod sursa(job #2300184)

Utilizator batabtroBatalan Vlad batabtro Data 10 decembrie 2018 22:21:58
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.58 kb
#include <bits/stdc++.h>

using namespace std;

ifstream fin("ciur.in");
ofstream fout("ciur.out");

int N, np;
bitset<2000010> b;

void ciur()
{
    if(N<2)
        return;
    for(int i=4; i <= N; i+=2)
    {
        b[i] = 1;
    }
    for(int i=3; i*i<=N; i+=2)
    {
        if(!b[i])
        {
            for(int j=3*i; j<=N; j=j+2*i)
                b[i*j] = 1;
        }
    }
    fout<<2;
    for(int i=3; i<=N; i+=2)
        if(b[i] == 0)
        {
            fout<<' '<<i;
        }
}

int main()
{
    fin >> N;
    ciur();
    return 0;
}