Cod sursa(job #520043)

Utilizator micutuzBalog Adrian micutuz Data 7 ianuarie 2011 12:43:12
Problema Fractii Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.33 kb
Raporteaza aceasta sursa 
#include<iostream.h>
#include<fstream.h>

int main()
{
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	int n, i, j, x[100], c=0;
	
	f>>n;
	
	for(i=2;i<=n;i++)
		x[i]=i-1;
	for(i=2;i<=n/2;i++)
	{
		c=c+x[i];
		for(j=i*2;j<=n;j=j+i)
			x[j]=x[j]-x[i];
	}
	g<<c*2+1;
	
	f.close();
	g.close();
	return 0;
}