Cod sursa(job #34031)
Utilizator | Data | 19 martie 2007 23:38:57 | |
---|---|---|---|
Problema | Cifre | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.49 kb |
#include<fstream.h>
int main(){
ifstream fin("cifre.in");
ofstream fout("cifre.out");
long int a,b,x,p=1;
double z=0;
short c,k=0,nr=0,s=0;
fin>>a>>b>>c>>k;
while (s<k-1) {
s++;
p*=10;}
for (long int i=p;i<=b;i++){
x=i;
nr=0;
for (;x!=0;x/=10)
if (x%10==c)
nr++;
if (nr>=k)
z++;}
if (z!=0){
long int h=b-a+1;
z/=h;
fout<<int(z);
if (int(z)<1){
z*=10000;
fout<<"."<<int(z);}}
else
fout<<0;
fin.close();
fout.close();
return 0;
}