Cod sursa(job #733051)
Utilizator | Iordan Vlad Vladinho97 | Data | 11 aprilie 2012 13:14:28 |
---|---|---|---|
Problema | Fractii | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.47 kb |
#include<fstream>
using namespace std;
int cmmdc(int x,int y)
{
while(x>1&&y>1)
{
if(x>y) x=x%y;
else y=y%x;
if(x==0) return y;
if(y==0) return x;
if((x==1)||(y==1)) return 1;
}
}
int indicator(int n)
{
int i,s;
s=1;
for(i=2;i<=n;i++)
if(cmmdc(i,n)==1)
s++;
return s;
}
int main()
{
ifstream f("fractii.in");
ofstream g("fractii.out");
int m,i,suma;
f>>m;
suma=1;
for(i=2;i<=m;i++)
suma+=indicator(i)*2;
g<<suma;
}