csp20191201 报数（Java）

package com.test;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int m = 0;
        int a= 0;
        int b= 0;
        int c= 0;
        int d= 0;

        for (int i = 1;i<10000;i++){
            if (seven(i)){
                m++;
                int flag = i %4;
                switch (flag){
                    case 1:a++;
                        break;
                    case 2:b++;
                        break;
                    case 3:c++;
                        break;
                    case 0:d++;
                        break;
                }
            }
            if (i-m == n){
                System.out.println(i-m);
                break;
            }
        }
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
        System.out.println(d);

    }

    static boolean seven(int i) {
        if (i%7 == 0){
            return true;
        }
        while(i>0){
            if (i%10 == 7){
                return true;
            }
            i = i / 10;
        }
        return false;
    }
}