static long stirlingNumber ( int r , int n ) {
  if ( n > r ) return - 1 ;
  if ( n == 0 ) return 0 ;
  if ( r == n ) return 1 ;
  if ( n == 1 ) return factorial ( r - 1 ) ;
  if ( r - n == 1 ) return nCr ( r , 2 ) ;
  else return stirlingNumber ( r - 1 , n - 1 ) + ( r - 1 ) * stirlingNumber ( r - 1 , n ) ;
}

static long stirlingNumber ( int r , int n ) { if ( n > r ) return - 1 ; if ( n == 0 ) return 0 ; if ( r == n ) return 1 ; if ( n == 1 ) return factorial ( r - 1 ) ; if ( r - n == 1 ) return nCr ( r , 2 ) ; else return stirlingNumber ( r - 1 , n - 1 ) + ( r - 1 ) * stirlingNumber ( r - 1 , n ) ; }
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