题解 | #密码强度等级#

#include <iostream>
#include <string>
using namespace std;

//密码长度
int len(const string s) {
    if (s.length() <= 4)
        return 5;
    if (s.length() >= 8)
        return 25;
    return 10;
}

//字母
int letters(const string s) {
    int grade = 0;
    //如果有小写字母，加十分
    for (int i = 0; i < s.length(); i++)
        if (('a' <= s[i]) && (s[i] <= 'z')) {
            grade += 10;
            break;
        }
    //如果有大写字母，加十分
    for (int i = 0; i < s.length(); i++)
        if (('A' <= s[i]) && (s[i] <= 'Z')) {
            grade += 10;
            break;
        }
    return grade;
}

//数字
int digits(const string s) {
    int grade = 0;
    //每个数字记十分
    for (int i = 0; i < s.length(); i++)
        if (('0' <= s[i]) && (s[i] <= '9'))
            grade += 10;
    //超过20分，记20分
    if (grade > 20)
        return 20;
    else return grade;
}

//符号
int symbol(const string s) {
    int grade = 0;
    //每个符号记十分
    for (int i = 0; i < s.length(); i++) {
        if ((0x21 <= s[i]) && (s[i] <= 0x2f))
            grade += 10;
        if ((0x3A <= s[i]) && (s[i] <= 0x40))
            grade += 10;
        if ((0x5B <= s[i]) && (s[i] <= 0x60))
            grade += 10;
        if ((0x7B <= s[i]) && (s[i] <= 0x7E))
            grade += 10;
    }
    //超过十分，记25分
    if (grade > 10)
        return 25;
    else return grade;
}

//奖励
int reward(const int score1, const int score2, const int score3,
           const int score4) {
    //没有数字
    if (score3 == 0)
        return 0;
    //没有字母
    if (score2 == 0)
        return 0;
    //没有符号，但有字母和数字
    if (score4 == 0)
        return 2;
    //字母分大小写，且有数字和符号
    if (score2 == 20)
        return 5;
    //字母只有大写或小写，且有数字和符号
    return 3;
}

//统计总分
int score(const string s) {
    int scores = 0;
    int score1 = len(s);
    scores += score1;
    int score2 = letters(s);
    scores += score2;
    int score3 = digits(s);
    scores += score3;
    int score4 = symbol(s);
    scores += score4;
    int score5 = reward(score1, score2, score3, score4);
    scores += score5;
    return scores;
    return 0;
}

//计分并划分等级
void test(const string s) {
    int scores = score(s);
    //划分等级
    switch (scores / 10) {
        case 9:
            cout << "VERY_SECURE" << endl;
            return;
        case 8:
            cout << "SECURE" << endl;
            return;
        case 7:
            cout << "VERY_STRONG" << endl;
            return;
        case 6:
            cout << "STRONG" << endl;
            return;
        case 5:
            cout << "AVERAGE" << endl;
            return;
        default:
            if (scores >= 25) {
                cout << "WEAK" << endl;
                return;
            } else {
                cout << "VERY_WEAK" << endl;
                return;
            }
    }
}

int main() {
    int a, b;
    string s;
    while (cin >> s) { // 注意 while 处理多个 case
        test(s);
    }
}
// 64 位输出请用 printf("%lld")