Cod sursa(job #418074)
Utilizator | Mutascu Adrian - Dragos dexter_dex | Data | 15 martie 2010 13:18:40 |
---|---|---|---|
Problema | Fractii | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.41 kb |
#include <stdio.h>
#define Nmax 1000001
long long n, i, j, v[Nmax], S;
int main (){
FILE * f = fopen ("fractii.in", "r");
FILE * g = fopen ("fractii.out", "w");
fscanf (f, "%lld", &n);
for (i = 2 ; i <= n ; i++){
v[i] += i-1;
S = S + v[i];
for (j = 2*i ; j <= n ; j += i)
v[j] -= v[i];
}
S += S;
++S;
fprintf (g ,"%lld", S);
fclose(f);
fclose(g);
return 0;
}