Cod sursa(job #1978647)

Utilizator babaian_danieldaniel babaian babaian_daniel Data 8 mai 2017 14:23:05
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
#include <bitset>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
bitset<2000000> v;
int main()
{
int num,c,i1;
f>>num;
c=1;
v[1]=1;
for (int i=3;i<=num;i=i+2)
{
if (v[i]==0) {i1=i+i;c=c+1;v[i]=1; 
while (i1<=num){
v[i1]=1;
i1=i1+i;
}
}
}	
g<<c;	
	
	
	
return 0;
}