题解 | #密码验证合格程序#

import java.util.*;

// 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);
        
        while(in.hasNextLine()){
            String str = in.nextLine();
            char[] chars = str.toCharArray();


            int cnt = 0;
		  //判断长度
            if(chars.length > 8){
                ++cnt;
            }
            
		  //判断大小写、数字和符号
            int isLow = 0, isUp = 0, isDig = 0, isLetter = 0;
            for(char ch : chars){
                if(Character.isLowerCase(ch)){
                    isLow = 1;
                }
                if(Character.isUpperCase(ch)){
                    isUp = 1;
                }
                if(Character.isDigit(ch)){
                    isDig = 1;
                }
                if(!Character.isLetterOrDigit(ch)){
                    isLetter = 1;
                }
                if(isLow + isUp + isDig + isLetter >= 3){
                    ++cnt;
                    break;
                }
            }
            
		  //判断子串
            int sign = 1;
            for(int i = 0; i < str.length() -2; ++i){
                String s = str.substring(i, i + 3);
                if(str.substring(i + 1).contains(s)){
                    sign = 0;
                    break;
                }
            }

            cnt += sign;

            if(cnt >= 3){
                System.out.println("OK");
                continue;
            }
            System.out.println("NG");
        }
    }
}