题解 | #密码强度等级#

import java.util.*;
import java.util.regex.*;
// 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.hasNextLine()) { // 注意 while 处理多个 case
            String password = in.nextLine();
            System.out.print(level(password));
        }
    }
    static String level(String psw) {
        int score = score(psw);
        if (score >= 90) {
            return "VERY_SECURE";
        }
        if (score >= 80) {
            return "SECURE";
        }
        if (score >= 70) {
            return "VERY_STRONG";
        }
        if (score >= 60) {
            return "STRONG";
        }
        if (score >= 50) {
            return "AVERAGE";
        }
        if (score >= 25) {
            return "WEAK";
        }
        return "VERY_WEAK";


    }
    public static int score(String psw) {
        int length = length(psw);
        int letter = letter(psw);
        int num = num(psw);
        int charact = charact(psw);
        int  reward = 0;
        if (letter > 0 && num > 0) {
            reward = Math.max(2, reward);
        }
        if (letter > 0 && num > 0 && charact > 0) {
            reward = Math.max(3, reward);
        }
        if (letter == 20 && num > 0 && charact > 0) {
            reward = Math.max(5, reward);
        }

        return length + letter + num + charact + reward;
    }

    static int length(String psw) {
        int length = psw.length();
        if (length <= 4) {
            return 5;
        } else if (length >= 5 && length <= 7) {
            return 10;
        } else {
            return 25;
        }
    }
    static int letter(String psw) {
        int lower = 0;
        int upper = 0;
        Matcher l = matcher("[a-z]", psw);
        if (l.find()) {
            lower = 10;
        }
        Matcher u = matcher("[A-Z]", psw);
        if (u.find()) {
            upper = 10;
        }

        return lower + upper;
    }
    static int num(String psw) {
        int res = 0;
        Matcher matcher = matcher("[0-9]", psw);
        while (matcher.find()) {
            res = res >= 10 ? 20 : 10;
        }
        return res;
    }
    static int charact(String psw) {
        int res = 0;
	  //正则表达式是用来匹配除了小写字母、大写字母、数字和中文之外的所有字符
	  //`^`：在方括号内，`^`表示“非”的意思，也就是除了后面的字符之外的所有字符。
        Matcher matcher = matcher("[^0-9a-zA-Z\u4e00-\u9fa5]", psw);
        while (matcher.find()) {
            res = res >= 10 ? 25 : 10;
        }
        return res;
    }

    static Matcher matcher(String regex, String psw) {
        return Pattern.compile(regex).matcher(psw);
    }
}