题解 | 密码验证合格程序

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String sr = in.nextLine();
            if (sr.length() < 8) {
                System.out.println("NG");
                continue;
            }
            boolean[] flag = new boolean[5];
            for (int i = 0; i < sr.length(); i++) {
                if (flag[0] == false && 'A' <= sr.charAt(i) && sr.charAt(i) <= 'Z') {
                    flag[0] = true;
                } else if (flag[1] == false && 'a' <= sr.charAt(i) && sr.charAt(i) <= 'z') {
                    flag[1] = true;
                } else if (flag[2] == false && '0' <= sr.charAt(i) && sr.charAt(i) <= '9') {
                    flag[2] = true;
                } else if (flag[3] == false && !(('A' <= sr.charAt(i) && sr.charAt(i) <= 'Z') ||
                                                 ('a' <= sr.charAt(i) && sr.charAt(i) <= 'z') ||
                                                 ('0' <= sr.charAt(i) && sr.charAt(i) <= '9') ||
                                                 sr.charAt(i) == ' ' || sr.charAt(i) == '\n')) {
                    flag[3] = true;
                }
                if (i < sr.length() - 5 && sr.substring(i + 3, sr.length()).contains(sr.substring(i, i + 3))) {
                    flag[4] = true;
                    break;
                }
            }
            if(flag[4] == true){
                System.out.println("NG");
                continue;
            }
            int sum = 0;
            for (int j = 0; j < 4; j++) {
                if (flag[j] == true) sum++;
            }
            if (sum >= 3) {
                System.out.println("OK");
                continue;
            } else {
                System.out.println("NG");
            }
        }
    }
}