bahmanm

;;; A quick way to run JUnit tests:
;;; `C-x t u` runs all the test cases in a unit.
;;; `C-x t c` runs a single test case.
;;;
;;; Simply add the snippet at the end of `init.el` or `.emacs`.
;;; NOTE: It assumes you are using projectile to manage the project.
;;;
;;; By Bahman Movaqar

;; runs all test cases in the current class

bahmanm

/*
 * Solve the equation A + B = CD - E = FG
 *   WHERE A..G in [0,1,2,3,7,8,9]
 *   AND CD = 10*C + D
 *   AND FG = 10*F + G
 *   AND C not 0 and F not 0
 *   AND different letters are different digits
 */ 

[0,1,2,3,7,8,9].permutations().findAll {                                                 

bahmanm

/*
 * Author: Bahman Movaqar <Bahman AT BahmanM.com>
 * Copyright (c) Bahman Movaqar
 * This file is released under public domain license.
 */
///// Tests below the main class

import groovy.transform.PackageScope

/**

bahmanm

List kCombinations(List l, Integer k) {
    assert k >= 0, 'Invalid "k"'
    if (l.empty || !k) []
    else if (k == 1) l.collate(1)
    else
        (0..l.size()-1).inject([] as Set) { acc, i ->
            def c = kCombinations(l.drop(i+1), k-1)
            acc + [l[i], c].combinations { cn ->
                def cnf = cn.flatten()
                cnf.size() == k ? cnf : [l[i],c].flatten()