题解 | 密码强度等级

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

int pwd_len_score(int len) {
    int score = 0;
    if ( len <= 4)
        score = 5;
    else if ( len <= 7)
        score = 10;
    else
        score = 25;
    return score;
}

int letter_score(int cnt_upper, int cnt_lower) {
    int score = 0;
    if (((cnt_upper > 0) && (cnt_lower == 0)) || ((cnt_upper == 0) &&
            (cnt_lower > 0))) {
        score = 10;
    } else if ((cnt_upper > 0) && (cnt_lower > 0)) {
        score = 20;
    }
    return score;
}

int digit_score( int cnt_digit ) {
    int score = 0;
    if (cnt_digit == 1)
        score = 10;
    else if (cnt_digit > 1)
        score = 20;
    return score;
}

int symbol_score(int cnt_symbol) {
    int score = 0;
    if ( cnt_symbol == 1)
        score = 10;
    else if ( cnt_symbol > 1)
        score = 25;
    return score;
}

int reward_score( int cnt_lower, int cnt_upper, int cnt_digit, int cnt_symbol) {
    int score = 0;
    if (cnt_lower > 0 && cnt_upper > 0 && cnt_digit > 0 && cnt_symbol > 0)
        score = 5;
    else if ((cnt_lower > 0 || cnt_upper > 0) && (cnt_digit > 0) &&
             (cnt_symbol > 0))
        score = 3;
    else if ((cnt_lower > 0 || cnt_upper > 0) && cnt_digit > 0)
        score = 2;
    return score;
}

void get_security_level( int score ) {
    if (score >= 90) {
        cout << "VERY_SECURE" << endl;
    } else if (score >= 80) {
        cout << "SECURE" << endl;
    } else if (score >= 70) {
        cout << "VERY_STRONG" << endl;
    } else if (score >= 60) {
        cout << "STRONG" << endl;
    } else if (score >= 50) {
        cout << "AVERAGE" << endl;
    } else if (score >= 25) {
        cout << "WEAK" << endl;
    } else {
        cout << "VERY_WEAK" << endl;
    }
}

int main() {
    string s;
    while ( getline(cin, s) ) {
        int lower = 0, upper = 0, digit = 0, symbol = 0;
        for (char i : s) {
            if (islower(i)) //小写字母
                ++lower;
            else if (isupper(i)) //大写字母
                ++upper;
            else if (isdigit(i)) //数字
                ++digit;
            else
                ++symbol;   //符号
        }
        int sum_score = pwd_len_score(s.size()) + letter_score( lower,
                        upper) + digit_score(digit) + symbol_score(symbol) + reward_score(lower, upper,
                                digit, symbol);
        get_security_level(sum_score);
    }
    return 0;
}