杭电ACM2043密码的问题已经AC

#include <iostream>#include <stdio.h>#include <string.h>using namespace std;int main(){    char a[50];    int m,k1,k2,k3,k4;    unsigned i;    cin>>m;    getchar();    while(m--)    {        k1=k2=k3=k4=0;        cin.getline(a,50);        if(strlen(a)<8||strlen(a)>16)        {            cout<<"NO"<<endl;        }        else        {            for(i=0;i<strlen(a);i++)            {                if(a[i]>='0'&&a[i]<='9')                    k1=1;                if(a[i]>='a'&&a[i]<='z')                    k2=1;                if(a[i]>='A'&&a[i]<='Z')                    k3=1;                if(a[i]=='~'||a[i]=='!'||a[i]=='@'||a[i]=='#'||a[i]=='$'||a[i]=='%'||a[i]=='^')                    k4=1;            }            if(k1+k2+k3+k4>=3)                cout<<"YES"<<endl;            else                cout<<"NO"<<endl;        }    }    return 0;}