static int count ( String s , int k ) {
  int n = s . length ( ) ;
  int d = 0 , i ;
  int count = 0 ;
  for ( i = 0 ;
  i < n ;
  i ++ ) d += s . charAt ( i ) ;
  if ( d % k == 0 ) count += 1 ;
  for ( i = k ;
  i < n ;
  i ++ ) {
    int prev = s . charAt ( i - k ) ;
    d -= prev ;
    d += s . charAt ( i ) ;
    if ( d % k == 0 ) count += 1 ;
  }
  return count ;
}

static int count ( String s , int k ) { int n = s . length ( ) ; int d = 0 , i ; int count = 0 ; for ( i = 0 ; i < n ; i ++ ) d += s . charAt ( i ) ; if ( d % k == 0 ) count += 1 ; for ( i = k ; i < n ; i ++ ) { int prev = s . charAt ( i - k ) ; d -= prev ; d += s . charAt ( i ) ; if ( d % k == 0 ) count += 1 ; } return count ; }
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