Cod sursa(job #2038416)

Utilizator mozsaattilamozsaattila mozsaattila Data 13 octombrie 2017 17:43:34
Problema Ciurul lui Eratosthenes Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;




int main()
{
    int n,i,j,s=0;
    bool t[2000000]={0};
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    f>>n;
    for(i=2;i*i<=n;i++){
        if(t[i]==0)
            for(j=i+i;j<=n;j=j+i)t[j]=1;
    }
    for(i=2;i<=n;i++)
        if(t[i]==0)s++;
    g<<s;
}