密码(没法偷懒了，大写字母可以用isupper函数，小写字母可以用islower函数，数字可以用isdigit函数，特殊符号没法用ispunct函数)

解题思路:

ispunct()检查给定字符是否是当前C语言环境中的标点符号

默认的C语言环境的字符

!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~

分类为标点符号

明显比题目要求得多了，那就只能一个个比较了

注意事项:

参考代码:

#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
    int m;
    scanf("%d",&m);
    char a[100];
    for(int i=0;i<m;i++)
    {
        scanf("%s",a);
        int len=strlen(a);
        char *p=a;
        int upper=0,lower=0,digit=0,punct=0;
        if(len>=8&&len<=16)
        {
            while(*p!='\0')
            {
                if(isupper(*p))
                {
                    upper=1;
                }
                else if(islower(*p))
                {
                    lower=1;
                }
                else if(isdigit(*p))
                {
                    digit=1;
                }
                else if(*p=='~'||*p=='!'||*p=='@'||*p=='#'||*p=='$'||*p=='%'||*p=='^')
                {
                    punct=1;
                }
                p++;
            }
            if(upper+lower+digit+punct>=3)
            {
                printf("YES\n");
                continue;
            }
        }
        printf("NO\n");
    }
	return 0;
}