On Wednesday, March 23, 2016 at 12:35:26 PM UTC-4, rom cgb wrote:
> Thanks all for the interesting replies.
>
> About using an external package, there also the case like on
> www.hackerrank.com where you have to run the code in their own environment
> (eg: http://i.imgur.com/iSSPLGy.png).
I use racket for hackerrank and coding contests all the time, and I find it's
read syntax really useful. For instance, I would parse this into a list of
lists by doing
(for/list ([i (in-range (read))])
(map (lambda (x) (if (list? x) (cadr x) x)) (read))).
Then, to print out results, I normally do
(define (main n)
(unless (= 0 n)
(begin (printf "~a ... ~a\n", args...)
(main (sub1 n)))).
Another really useful helper is
(define (read->list n)
(if (= 0 n) '()
(cons (read) (read->list (sub1 n)))).
You can customize these by doing for/vector, for/fold, etc., and there hasn't
been a hackerrank contest I've run into that I haven't been able to do with
some technique like this.
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