题解 | #包含数字9的数#

#include<iostream>
using namespace std;
int main(){
  int result = 0;
	for (int i = 1; i < 2020; i++) {
		string number = to_string(i);
		if (number.find("9") != -1) {
			result++;
		}
	}
	cout << result << endl;
    return 0;
}