Cod sursa(job #2920203)

Utilizator Bogdan345Marius Mihalache Bogdan345 Data 22 august 2022 18:14:03
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
 bool v[2000001];
int main(){
 int n,cnt=0;
 fin>>n;
 for(int i=2;i<=n;i++){
    if(v[i]==0){
            cnt++;
        for(int j=i+i;j<=n;j=j+i){
            v[j]=1;
        }
    }



 }
 fout<<cnt;
}