https://blog.csdn.net/lshsgbb2333/article/details/78706322?utm_medium=distribute.pc_relevant_download.none-task-blog-BlogCommendFromBaidu-6.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-BlogCommendFromBaidu-6.nonecas

https://www.cnblogs.com/wyd76/p/10759326.html

#include<iostream>
#include<sstream>
using namespace std;
int fenli(int x,int n)
{
int len,sum=0;
string res,number;
stringstream ss;
stringstream ss1;
ss1<<x;
ss1>>number;
while(n>0){
ss<<n;
ss>>res;
len=res.length();
for(int i=0;i<len;i++)
{
if(res[i]==number[0])
{
sum++;
}
}
n--;
ss.clear();
}
return sum;
}
int main()
{
int n;
int x;
int sum=0;
while(scanf("%d%d",&n,&x)!=EOF)
{
sum=fenli(x,n);
cout<<sum<<endl;
}
return 0;
}