Cod sursa(job #547639)

Utilizator bogdan353Costea Bogdan bogdan353 Data 6 martie 2011 16:11:27
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.36 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;

char x[2000009];
long long n,i,j;
int main()
{
	ifstream f("ciur.in");
	ofstream g("ciur.out");
	
	f>>n;
	for(i=1;i<=n;i++)
		x[i]=1;
	int cont=0;
	for( i=2;i<=n;i++)
	
		if(x[i]==1)
		{
			for(j=i;j<=n;j=j+i)
				x[j]=0;
			cont++;
		}
				
			
		
	
	g<<cont;				
	
		
}