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Cod sursa(job #999390)
#include <math.h>
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
ifstream in("cifre.in");
ofstream out("cifre.out");
unsigned int cifre(unsigned long n, unsigned int b)
{
unsigned int a;
a = 0;
while(n!=0)
{
if(n%10 == b)
{
a++;
}
n/=10;
}
return a;
}
int main()
{
out << setprecision(4);
unsigned long a,b,k,c,l,r;
in >> a;
in >> b;
in >> c;
in >> k;
in.close();
l=(b-a+1);
r=0;
while(a<=b)
{
if(cifre(a, c) >= k)
{
r++;
}
a++;
}
out<<((double) r) / l;
return 0;
}