题解 | #密码强度等级#按逻辑写，行数太多了

#include <stdio.h>
#include <string.h>

int main() {
    char password[300];
    scanf("%s", password);
    int score = 0;

    int len = strlen(password); //密码长度
    if (len <= 4) {
        score += 5;
    } else if (len >= 5 && len <= 7) {
        score += 10;
    } else {
        score += 25;
    }

    int lowerCaseNum = 0, capitalNum = 0; //字母
    for (int i = 0; i < len; i++) {
        if (password[i] >= 'a' && password[i] <= 'z') {
            lowerCaseNum++;
        } else if (password[i] >= 'A' && password[i] <= 'Z') {
            capitalNum++;
        }
    }
    if (lowerCaseNum == 0 && capitalNum == 0) {
        score += 0;
    } else if ((lowerCaseNum == 0 && capitalNum != 0) || (lowerCaseNum != 0 && capitalNum == 0)) {
        score += 10;
    } else if (lowerCaseNum != 0 && capitalNum != 0) {
        score += 20;
    }

    int digitNum = 0; //数字
    for (int j = 0; j < len; j++) {
        if (password[j] >= '0' && password[j] <= '9') {
            digitNum++;
        }
    }
    if (digitNum == 0) {
        score += 0;
    } else if (digitNum == 1) {
        score += 10;
    } else if (digitNum > 1) {
        score += 20;
    }

    int symbolNum = 0; //符号
    for (int k = 0; k < len; k++) {
        if ((password[k] >= '!' && password[k] <= '/') || (password[k] >= '{' && password[k] <= '~')) { //条件略多，分两个写
            symbolNum++;
        } else if ((password[k] >= ':' && password[k] <= '@') || (password[k] >= '[' && password[k] <= '`')) {
            symbolNum++;
        }
    }
    if (symbolNum == 0){
        score += 0;
    } else if (symbolNum == 1) {
        score += 10;
    } else if (symbolNum > 1) {
        score += 25;
    }

    //奖励机制
    int totalLetterNum = lowerCaseNum + capitalNum;
    if (totalLetterNum != 0 && digitNum != 0 && symbolNum == 0) {
        score += 2;
    } else if ((lowerCaseNum == 0 || capitalNum == 0) && totalLetterNum != 0 && digitNum != 0 && symbolNum != 0) { //注意判断大小写字母数和字母总数
        score += 3;
    } else if (lowerCaseNum != 0 && capitalNum != 0 && digitNum != 0 && symbolNum != 0) {
        score += 5;
    }

    //输出
    if (score >= 90) {
        printf("VERY_SECURE\n");
    } else if (score < 90 && score >= 80) {
        printf("SECURE\n");
    } else if (score < 80 && score >= 70) {
        printf("VERY_STRONG\n");
    } else if (score < 70 && score >= 60) {
        printf("STRONG\n");
    } else if (score < 60 && score >= 50) {
        printf("AVERAGE\n");
    } else if (score < 50 && score >= 25) {
        printf("WEAK\n");
    } else if (score < 25 && score >= 0) {
        printf("VERY_WEAK\n");
    }

    return 0;
}