题解 | #密码强度等级# C++

#include <iostream>
#include <cctype>

using namespace std;

int find_c (string str, int (*func)(int c)) {
    int count = 0;
    for (char c : str) {
        if (func(c)) {
            ++count;
        }
    }
    return count;
}

int issymbol(int c) {
    if ((c >= 0x21 && c <=0x2F)
        || (c >= 0x3A && c <= 0x40)
        || (c >= 0x5B && c <= 0x60)
        || (c >= 0x7B && c <= 0x7E)
    ) {
        return 1;
    }
    return 0;
}

int main() {
    string passwd;
    cin >> passwd;
    int score = 0;
    int len = passwd.size();
    if (len <= 4) {
        score += 5;
    } else if (len >= 5 && len <= 7) {
        score += 10;
    } else {
        score += 25;
    }

    int up_num = find_c (passwd, isupper);
    int low_num = find_c (passwd, islower);
    int alpha_num = up_num + low_num;
    if (up_num > 0 && low_num > 0) {
        score += 20;
    } else if ((up_num > 0 && low_num == 0) || (up_num == 0 && low_num > 0)) {
        score += 10;
    }
    int dig_num = find_c(passwd, isdigit);
    if (dig_num == 1) {
        score += 10;
    } else if (dig_num > 1) {
        score += 20;
    }

    int sym_num = find_c(passwd, issymbol);
    if (sym_num == 1) {
        score += 10;
    } else if (sym_num > 1) {
        score += 25;
    }

    int bonus = 0;
    if (alpha_num >= 1 && dig_num >= 1) {
        bonus += 2;
        if (sym_num >= 1) {
            bonus += 1;
            if (up_num >= 1 && low_num >= 1) {
                bonus += 2;
            }
        }
    }

    score += bonus;
    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 if (score >= 0) {
        cout << "VERY_WEAK" << endl;
    }
    return 0;
}