From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: Re: puzzle with string permutations [photo] Date: Tue, 07 Jun 2022 09:58:59 +0200 Message-ID: <87fskgsy4c.fsf@dataswamp.org> References: <87r141rn8n.fsf@dataswamp.org> <87wndtrlpg.fsf@mbork.pl> <87k09ssycf.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="22705"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:RlHakfpa4eRRcpcF5ft39eP1EIU= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jun 07 10:02:27 2022 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nyUAV-0005bk-FE for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 07 Jun 2022 10:02:27 +0200 Original-Received: from localhost ([::1]:36284 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nyUAT-0006kC-IN for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 07 Jun 2022 04:02:25 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37874) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nyU8D-0006jw-Dm for help-gnu-emacs@gnu.org; Tue, 07 Jun 2022 04:00:05 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:44132) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nyU8B-0001xS-5w for help-gnu-emacs@gnu.org; Tue, 07 Jun 2022 04:00:04 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nyU89-0001k7-Qg for help-gnu-emacs@gnu.org; Tue, 07 Jun 2022 10:00:01 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:137504 Archived-At: >> (calc-eval "fact(5)") => "120" >> (calc-eval "fact(10)") => "3628800" > > Indeed, however that isn't lispy either ... (defun faculty (n) (if (> n 1) (* n (faculty (1- n))) 1) ) ;; (faculty 5) ; 120 ;; (faculty 10) ; 3 628 800 (defun string-perms-num (str) (faculty (length str) )) ;; (string-perms-num "kudce") ; 120 -- underground experts united https://dataswamp.org/~incal