题解 | #密码验证合格程序#

import java.util.Scanner;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
            String str = null;
            while ((str = br.readLine()) != null) {
                if (str.length() <= 8) {
                    System.out.println("NG");
                    return;
                }
                List<Character> lowercases = new ArrayList<>();
                for (int i = 0; i < 26; i++) {
                    lowercases.add((char)(97 + i));
                }
                List<Character> uppercases = new ArrayList<>();
                for (int i = 0; i < 26; i++) {
                    uppercases.add((char)(65 + i));
                }
                List<Integer> numbers = new ArrayList<>();
                for (int i = 0; i < 10; i++) {
                    numbers.add(i);
                }
                List<Character> characters = new ArrayList<>();
                char[] specials = "~!@#$%^&*_,./\\\\?|".toCharArray();
                for (int i = 0; i < specials.length; i++) {
                    characters.add(specials[i]);
                }
                char[] chars = str.toCharArray();
                int lowercaseCount = 0;
                int uppercaseCount = 0;
                int numberCount = 0;
                int specialCount = 0;
                for (int i = 0; i < chars.length; i++) {
                    if (lowercases.contains(chars[i])) {
                        lowercaseCount++;
                    } else if (uppercases.contains(chars[i])) {
                        uppercaseCount++;
                    } else if (characters.contains(chars[i])) {
                        specialCount++;
                    } else if (numbers.contains(chars[i] - '0')) {
                        numberCount++;
                    }
                }
                int count = 0;
                count = lowercaseCount > 0 ? ++count : count;
                count = uppercaseCount > 0 ? ++count : count;
                count = numberCount > 0 ? ++count : count;
                count = specialCount > 0 ? ++count : count;
                if (count >= 3) {
                    List<String> list = new ArrayList<>();
                    boolean b = true;
                    for (int j = 0; j < str.length(); j++) {
                        int endIndex = j + 3 >= str.length() ? str.length() : j + 3;
                        String substring = str.substring(j, endIndex);
                        if (!list.contains(substring)) {
                            list.add(substring);
                        } else {
                            b = false;
                            break;
                        }
                    }
                    if (b) {
                        System.out.println("OK");
                    } else {
                        System.out.println("NG");
                    }
                } else {
                    System.out.println("NG");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}