题解 | #密码强度等级#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String password = sc.nextLine();
            int score = 0;
            // 密码长度
            int length = password.length();
            if (length < 5) {
                score += 5;
            } else if (length < 8) {
                score += 10;
            } else {
                score += 25;
            }

            // 字母
            boolean hasSmallLetter = false;
            boolean hasBigLetter = false;
            // 数字
            int digitCount = 0;

            // 去除非字母数字的字符
            String replacePassWord = password.replaceAll("[^a-zA-Z0-9]", "");
            // 特殊字符个数
            int symbolCount = password.length() - replacePassWord.length();
            for (char c : replacePassWord.toCharArray()) {
                if (Character.isDigit(c)) {
                    digitCount++;
                }
                if (c >= 'a' && c <= 'z') {
                    hasSmallLetter = true;
                }
                if (c >= 'A' && c <= 'Z') {
                    hasBigLetter = true;
                }
            }
            // 字母得分
            boolean hasLetter = (hasSmallLetter && !hasBigLetter)
                    || (!hasSmallLetter && hasBigLetter);
            if (hasLetter) {
                score += 10;
            } else if (hasSmallLetter && hasBigLetter) {
                score += 20;
            }
            // 数字得分
            if (digitCount == 1) {
                score += 10;
            } else if (digitCount > 1) {
                score += 20;
            }
            // 特殊字符得分
            if (symbolCount == 1) {
                score += 10;
            } else if (symbolCount > 1) {
                score += 25;
            }
            // 奖励得分
            if (hasSmallLetter && hasBigLetter && digitCount > 0 && symbolCount > 0) {
                score += 5;
            } else if (hasLetter && digitCount > 0 && symbolCount > 0) {
                score += 3;
            } else if (hasLetter && digitCount > 0) {
                score += 3;
            }
            
            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 {
                System.out.println("VERY_WEAK");
            }
        }
    }
}