题解 | 密码强度等级

#include <cctype>
#include <iostream>
#include <string>
using namespace std;
// VERY_SECURE >= 90: 非常安全
// SECURE      >= 80: 安全
// VERY_STRONG >= 70: 非常强
// STRONG      >= 60: 强
// AVERAGE     >= 50: 一般
// WEAK        >= 25: 弱
// VERY_WEAK   >= 0:  非常弱
string securityLevel(const string& s){
    int grade = 0;
    //1.长度
    int s_len = s.size();
    if(!s_len) return "VERY_WEAK";
    if(s_len <= 4) {
        grade += 5;
    }else if (s_len > 4 && s_len < 8) {
        grade += 10;
    }else if (s_len >= 8) {
        grade += 25;
    }

    //2.字母
    int upper = 0, lower = 0 ,  digits = 0,  symbol = 0;    //奖励 1：大小写+数字+符号 3 + 1 + 1 = 5
    int bouns = 0;                                          //奖励 2：字母+数字+符号 1 + 1 + 1 = 3
    for(auto c : s){                                        //奖励 3：字母+数字      1 + 1 = 2
        if(isalpha(c)){
            if(isupper(c)){
                upper++;
            }else {
                lower++;
            }
        }else if(isdigit(c)){
            digits++;
        }else {
            symbol++;
        }
    }
    //2.字母
    if (upper != 0 && lower != 0 ) {
        grade += 20;
        bouns += 3;
    }else if(upper + lower == 0){
        grade += 0;
    }else {
        grade += 10;
        bouns += 1;
    }

    //3.数字
    if (digits > 1 ) {
        grade += 20;
        bouns += 1;
    }else if(digits == 1){
        grade += 10;
        bouns += 1;
    }else {
        grade += 0;
    }
    //4.符号
    if (symbol > 1 ) {
        grade += 25;
        bouns += 1;
    }else if(symbol == 1){
        grade += 10;
        bouns += 1;
    }else {
        grade += 0;
    }
    //5.奖励
    grade += bouns;
    //评分标准
    if(grade >= 90){
        return "VERY_SECURE";
    }else if (grade >= 80) {
        return "SECURE";
    }else if (grade >= 70) {
        return "VERY_STRONG";
    }else if (grade >= 60) {
        return "STRONG";
    }else if (grade >= 50) {
        return "AVERAGE";
    }else if (grade >= 25) {
        return "WEAK";
    }
    return "VERY_WEAK";

    
}
int main() {
    string password;
    getline(cin, password);
    cout<<securityLevel(password);
}