Cod sursa(job #2568851)

Utilizator Maftei_RazvanMaftei Ravzan Maftei_Razvan Data 4 martie 2020 10:10:24
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <bits/stdc++.h>

using namespace std;
ifstream fin ("ciur.in");
ofstream fout ("ciur.out");
int n, i, j, k;
int main()
{
    fin >> n;
    int v[n+1];
    for(i=2; i<=n; i++)
    {
        if(v[i]!=1)
            k++;
        for(j=i+i; j<=n; j=j+i)
            v[j]=1;
    }
    fout << k;
    return 0;
}