题解 | #密码强度等级#

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 int calculate(String password) {
        int score = 0;
        // 密码长度
        if (password.length() <= 4) {
            score += 5;
        } else if (password.length() >= 5 && password.length() <= 7) {
            score += 10;
        } else {
            score += 25;
        }

        // 包含字母，没有字母0分
        boolean lowerCase = false;
        boolean upperCase = false;
        int digitCount = 0;
        int symbolCount = 0;
        for (int i = 0; i < password.length(); i++) {
            char c = password.charAt(i);
            if (Character.isLowerCase(c)) {
                lowerCase = true;
            } else if (Character.isUpperCase(c)) {
                upperCase = true;
            } else if (Character.isDigit(c)) {
                digitCount++;
            } else if (c >= 32 && c <= 47 || c >= 58 && c <= 64 || c >= 91 && c <= 96 ||
                       c >= 123 && c <= 126) {
                symbolCount++;
            }
        }
        if (lowerCase && !upperCase || !lowerCase && upperCase) {
            score += 10;
        } else if (lowerCase && upperCase) {
            score += 20;
        }

        // 数字
        if (digitCount == 1) {
            score += 10;
        } else if (digitCount > 1) {
            score += 20;
        }

        // 符号
        if (symbolCount == 1) {
            score += 10;
        } else if (symbolCount > 1) {
            score += 25;
        }

        // 奖励项
        boolean flag1 = (lowerCase || upperCase) && digitCount > 0;
        boolean flag2 = flag1 && symbolCount > 0;
        boolean flag3 = (lowerCase && upperCase) && digitCount > 0 && symbolCount > 0;

        if (flag3) {
            score += 5;
            return score;
        }
        if (flag2) {
            score += 3;
            return score;
        }
        if (flag1) {
            score += 2;
            return score;
        }
        return score;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String password = sc.next();
        int score = calculate(password);
        if (score >= 90) {
            System.out.println("VERY_SECURE");
        } else if (score >= 80) {
            System.out.println("SECURE");
        } else if (score >= 70) {
            System.out.println("VERY_STRONG");
        } else if (score >= 60) {
            System.out.println("STRONG");
        } else if (score >= 50) {
            System.out.println("AVERAGE");
        } else if (score >= 25) {
            System.out.println("WEAK");
        } else if (score >= 0) {
            System.out.println("VERY_WEAK");
        }
    }
}