题解 | #密码验证合格程序#，看别人的觉得费劲，自己写的又太烂

import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<String> list = new ArrayList<>();
        while (scanner.hasNextLine()) {
            String nextLine = scanner.nextLine();
            if (nextLine.equals("")) {
                break;
            }
            list.add(nextLine);
        }
        /*密码要求:
        1.长度超过8位

        2.包括大小写字母.数字.其它符号,以上四种至少三种

        3.不能有长度大于2的不含公共元素的子串重复 （注：其他符号不含空格或换行*/
        ArrayList<String> result = new ArrayList<>();
        for (int i = 0; i < list.size(); i++) {
            String str = list.get(i);
            int length = str.length();
            if (length < 8) {
                result.add("NG");
                continue;
            }
            String s = str.replaceAll(" ", "");
            char[] chars = s.toCharArray();
            int upCase = 0;
            int lwCase = 0;
            int number = 0;
            int x = 0;
            for (int j = 0; j < chars.length; j++) {
                if (chars[j] >= 'A' && chars[j] <= 'Z') {
                    upCase++;
                    continue;
                }
                if (chars[j] >= 'a' && chars[j] <= 'z') {
                    lwCase++;
                    continue;
                }
                if (chars[j] >= '0' && chars[j] <= '9') {
                    number++;
                    continue;
                }
                x++;
            }
            int count = 0;
            if (upCase != 0) {
                count++;
            }
            if (lwCase != 0) {
                count++;
            }
            if (number != 0) {
                count++;
            }
            if (x != 0) {
                count++;
            }

            if (count < 3) {
                result.add("NG");
                continue;
            }
            boolean b = false;
            for (int j = 0; j < str.length() - 2; j++) {
                if(b){
                    break;
                }
                String substring1 = str.substring(j, j + 3);
                String substring2 = "";

                for (int k = 0; k < str.length() - 2; k++) {

                    if (j == k) {
                        continue;
                    }
                    substring2 = str.substring(k, k + 3);
                    if (substring1.equals(substring2)) {
                        result.add("NG");
                        b = true;
                        break;
                    }
                }
            }
            if (result.size() != i + 1) {
                result.add("OK");
            }
        }

        for (int i = 0; i < result.size(); i++) {
            System.out.println(result.get(i));
        }
    }
}