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Cod sursa(job #655070)
#include <fstream>
#include <iomanip>
using namespace std;
int nrc(int nr,int c) {
int cnt=0;
for(;nr!=0;nr/=10) if(nr%10==c) ++cnt;
return cnt;
}
int main()
{
int a,b,k,c,nrp,nrb=0;
ifstream f("cifre.in");
ofstream g("cifre.out");
f>>a>>b>>c>>k;
nrp=b-a+1;
for(int i=a; i<=b; ++i) if(nrc(i,c)>=k) ++nrb;
g<<fixed<<setprecision(4)<<(1.0*nrb)/(1.0*nrp);
return 0;
}