题解 | 密码验证合格程序

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner re = new Scanner(System.in);
        while (re.hasNextLine()) {
            String pw = re.nextLine();
            if (pw.length() < 8) {
                System.out.println("NG");
                continue;
            }
            boolean b = false, s = false, n = false, o = false, sp = true;
            for (int i = 0; i < pw.length(); i++) {
                if (i < pw.length() - 5 &&
                        pw.substring(i + 3, pw.length()).contains(pw.substring(i, i + 3))) {
                    sp = false;
                    break;
                } else {
                    char t = pw.charAt(i);
                    if ('A' <= t && t <= 'Z') {
                        b = true;
                    } else if ('a' <= t && t <= 'z') {
                        s = true;
                    } else if ('0' <= t && t <= '9') {
                        n = true;
                    } else if (t != ' ' && t != '\n') {
                        o = true;
                    }
                }
            }
            if (sp == false) {
                System.out.println("NG");
                continue;
            } else {
                int sum = 0;
                if (b == true) sum++;
                if (s == true) sum++;
                if (n == true) sum++;
                if (o == true) sum++;
                if (sum >= 3) System.out.println("OK");
                else System.out.println("NG");
            }
        }
    }
}