Cod sursa(job #798211)
Utilizator | Precup Ildiko ildikoprecup | Data | 15 octombrie 2012 22:13:24 |
---|---|---|---|
Problema | Fractii | Scor | 0 |
Compilator | c | Status | done |
Runda | Arhiva de probleme | Marime | 0.54 kb |
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main(int argc, char *argv[])
{
long n = 0;
long nr_ = 0;
long nr = 0;
long i = 0;
FILE * f = fopen("fractii.in", "r");
fscanf(f, "%ld", &n);
fclose(f);
nr = 2 * n - (n / 2) * (n / 2);
for (i = 3; i <= n ; i = i + 2)
{
nr = nr - (n / i) * ((n / i) - 1) - 1 + 2 * n;
}
if ( n % 2 == 1 ) nr = nr - n;
f = fopen("fractii.out", "w");
fprintf(f, "%ld", nr);
fclose(f);
return 0;
}