题解 | 记数问题

#include <iostream>
using namespace std;

void count()
{
    int n=0,x=0,cnt=0;
    cin >> n >> x;
    for(int i=1;i<=n;i++){
    	int temp = i;
        if(temp<10){
            if(temp == x) cnt++;
        } 
        else{
            while(temp > 0){
                if(temp%10 == x) cnt++;
                temp /= 10;
            }
        }
    }
    cout << cnt << endl;
}

int main() {
    count();
    return 0;
}