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

int main()
{
    int n,i;
    scanf("%d",&n);
    getchar();
    while(n--)
    {
        char a[100];
        gets(a);
        int l=0,k=0,m=0,p=0,sum=0,t;
        t=strlen(a);
        if(t<8||t>16)
        {
            printf("NO\n");   
        }
        else
        {
            for( i=0;i<t;i++)
            {
                if(a[i]>='a'&&a[i]<='z') m=1;
                else if(a[i]>='0'&&a[i]<=9) k=1;
                else if(a[i]<='Z'&&a[i]>='A') l=1;
                else if ((a[i]=='@')||(a[i]=='#')||(a[i]=='$')||(a[i]=='%')||(a[i]=='^')||(a[i]=='~')||(a[i]=='!')||(a[i]=='^' )) p=1;
            }
            sum=m+k+l+p;
            if(sum>=3)
            {
              printf("YES\n");
            }
            else printf("NO\n");   
        }
            
    }
    return 0;
   
}

怎么改啊？？？？？

意思是8~16个密码字符。且必须有三种以上才安全，如数字，小写，大写，特殊字符。。。。。。