这样可以
AC
```c
#include<bits/stdc++.h>
using namespace std;
int x,n;
int main(){
cin>>n>>x;
stringstream ss;
for (n++; --n; ss << n);
string s = ss.str();
cout << count(s.begin(), s.end(), x + '0') << endl;
return 0;
}
```
by timmyliao @ 2024-01-21 08:00:12
@[timmyliao](/user/1095093) 谢谢
by luoguxiaobai @ 2024-01-23 20:34:00