题解 | #密码验证合格程序#

import java.util.Scanner;
import java.util.regex.Pattern;

// 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) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        // while (in.hasNextInt()) { // 注意 while 处理多个 case
        //     int a = in.nextInt();
        //     int b = in.nextInt();
        //     System.out.println(a + b);
        // }
        String line = in.nextLine();
        int len = line.length();
        if (len < 9) {
            System.out.print("NG");
            return;
        }
        Pattern lowerPattern = Pattern.compile("[a-z]");
        Pattern upperPattern = Pattern.compile("[A-Z]");
        Pattern numberPattern = Pattern.compile("[0-9]");
        Pattern otherPattern = Pattern.compile("[^a-zA-Z0-9]");
        Pattern enterPattern = Pattern.compile("\\r");
        Pattern linePattern = Pattern.compile("\\n");
        if (linePattern.matcher(line).find() || enterPattern.matcher(line).find()) {
            System.out.print("NG");
            return;
        }

        //判断重复子串
        for (int i = 0; i < line.length() - 3; i++) {
            String subStr = line.substring(i, i + 3);
            String subLine = line.substring(i + 1);
            if (subLine.contains(subStr)) {
                System.out.print("NG");
                return;
            }
        }

        int count = 0;
        if (lowerPattern.matcher(line).find()) {
            count++;
        } 
        if (upperPattern.matcher(line).find()) {
            count++;
        } 
        if (numberPattern.matcher(line).find()) {
            count++;
        } 
        if (otherPattern.matcher(line).find()) {
            count++;
        } 
        if (count == 3 || count == 4) {
            System.out.print("OK");
        } else {
            System.out.print("NG");
        }
        
    }
}