题解 | #密码验证合格程序#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()){
            String str = sc.nextLine();
		  //若是满足题目要求的三个条件则输出OK，否则输出NG
            if(ifrules(str)+iflength(str)+unrept(str)==3)
                System.out.println("OK");
            else System.out.println("NG");
        }
    }
    //规则一，长度达标返回1，否则0
    public static int iflength(String str){
        if(str.length()<=8)return 0;
        else return 1;
    }
    //规则二，符合三种以及以上种符号返回1，否则返回0
    public static int ifrules(String str){
        int rule1 = 0,rule2 = 0,rule3 = 0,rule4 = 0;
        for (int i = 0; i < str.length(); i++) {
            if(str.charAt(i)>=48&&str.charAt(i)<=57)rule1=1;
            else if(str.charAt(i)>=65&&str.charAt(i)<=90)rule2=1;
            else if(str.charAt(i)>=97&&str.charAt(i)<=122)rule3=1;
            else rule4=1;
        }
        if(rule1+rule2+rule3+rule4>=3)return 1;
        else return 0;
    }
    //规则三，没有三个以及以上子串重复返回1，否则0
    public static int unrept(String str){
        String[] starr = new String[str.length()];
        for (int i = 0; i < str.length()-2; i++) {
            char[] temp = new char[3];
            temp[0] = str.charAt(i);
            temp[1] = str.charAt(i + 1);
            temp[2] = str.charAt(i + 2);
            String strtemp = new String(temp);
            if(i==0) {
                starr[i] = strtemp;
            }
            else{
                for (int j = 0; j < i; j++) {
                    if(starr[j].equals(strtemp)){
                        return 0;
                    }
                }
                starr[i]=strtemp;
            }

        }
        return 1;
    }
}