poj 1250

        本来用cin cout输入输出，可不知道怎么弄得cin was not declared in this scorpe，怎么调都不行，郁闷...

#include < iostream >
#include < cstdio >
#include < cstring >
int  main(){
     int  n, d ;
     char  a[ 100 ] ;
     bool  v[ 100 ], e[ 100 ] ;
     while (scanf( " %d " ,  & n) != EOF && n){
        scanf( " %s " ,  & a) ;
         int  b = 0  ;
        memset(v, 0 , sizeof (v)) ;
        memset(e, 0 , sizeof (e)) ;
         for ( int  i = 0 ; i < strlen(a); i ++ ){
            d  =  a[i] - ' A '  ;
             if ( ! v[d]){
                v[d]  =   true  ;
                 if (n > 0 ){
                    n  --  ;
                    e[d]  =   true  ;
                }
                 else  b ++  ;
            }
             else   if (e[d]) n  ++  ;
        }
         if (b == 0 )
            printf( " All customers tanned successfully.\n " ) ;
         else
            printf( " %d customer(s) walked away.\n " , b) ;
        }
     return   0  ;
}