题解 | #密码验证合格程序#

import java.util.Scanner;

// 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.hasNext()) { // 注意 while 处理多个 case
            String s = in.next();
            char[] c = s.toCharArray();
            int num = 0;
            int small = 0;
            int big = 0;
            int other = 0;
            boolean flag = false;
            if(c.length > 8){
                for(int i = 0; i < c.length; i++){
                    if('0' < c[i] && c[i] < '9'){
                        num = 1;
                    }
                    else if('a' < c[i] && c[i] < 'z'){
                        small = 1;
                    }
                    else if('A' < c[i] && c[i] < 'Z'){
                        big = 1;
                    }else{
                        other = 1;
                    }
                }
                if(num + small +big + other >= 3){
                    for(int j = 0; j + 3 < s.length(); j ++){
                        String s2 = s.substring(j, j+3);
                        String s3 = s.substring(0,j);
                        String s4 = s.substring(j+3, s.length());
                        if(s3.contains(s2) || s4.contains(s2)){
                            System.out.print("NG");
                            flag = false;
                            break;
                        }else{
                            flag = true;
                        }
                    }
                }else{
                    System.out.print("NG");
                }
            }else{
                System.out.print("NG");
            }
            if(flag){
                System.out.print("OK");
            }
        }
    }
}