题解 | #包含数字9的数#

public class Main {
    public static void main(String[] args) {
        int n = 0;
        for(int i = 1; i <= 2019; i++) {
            if(i % 10 == 9 || i / 10 % 10 == 9 || i / 100 % 10 == 9) {
                n++;
            }
        }
        System.out.println(n);
    }
}