Cod sursa(job #1775913)
Utilizator | Data | 10 octombrie 2016 20:00:37 | |
---|---|---|---|
Problema | Fractii | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.45 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("fractii.in");
ofstream fout ("fractii.out");
int cmmdc (int a,int b)
{
int t;
while(b)
{
t=a%b;
a=b;
b=t;
}
return a;
}
int main (void)
{
int n,s=0,i,j;
fin>>n;
s=n*2-1;
for(i=2;i<n;i++)
for(j=i+1;j<=n;j++)
if(cmmdc(i,j)==1)
s=s+2;
fout<<s;
return 0;
}