Rubyの配列組み換えメソッド群の使い方を覚えるために、前回10のチェスクイズを考えたよ。
10のチェスクイズでRubyの配列組み換えメソッドを覚えよう! - 10 Chess Quizzes to know Recombination Methods of Ruby Array
Array#permutationとかcombinationとかの組み換えメソッド群を使えば、このクイズは簡単に解けるけど、これらのメソッドの使用を禁止したら解くのは結構厄介かなと思ったんだけど、やってみたら簡単だったんで拍子抜けしちゃったよ^ ^;
一応結果だけここに貼っておくね..
def q1(list) ret = [] list.each { |x| list.each { |y| ret << [x, y] } } ret end def q2(xl, yl) ret = [] xl.each { |x| yl.each { |y| ret << [x, y] } } ret end def q3(board) board.inject(Hash.new{ |h,k| h[k] = [] }) { |h, code| h[code[0]] << code; h }.values end def q4(board) board.inject(Hash.new{ |h,k| h[k] = [] }) { |h, code| h[code[1]] << code; h }.values end def q5(board) board.inject(Hash.new{ |h,k| h[k] = [] }) { |h, cols| cols.each { |col| h[col[1]] << col }; h }.values end def q6(board) col1, col2, col3 = board.map { |col| col.to_enum } col1.to_a.size.times.map { [col1.next, col2.next, col3.next] } end def q7(board) ret = [] board.each { |a| board.each { |b| ret << [a, b] unless a == b } } ret.uniq { |x| x.sort } end def q8(pieces) ret = [] pieces.each { |first| pieces.each { |second| ret << [first, second] unless first == second } } ret end def q9(captures) bishops, remains = [], [] captures.each do |capture| if capture.include?(:bishop) bishops << capture else remains << capture end end [bishops, remains] end def q10(pieces) ret = [] pieces.each { |first| pieces.each { |second| ret << [first, second] } } ret.uniq { |x| x.sort } end require "rspec" describe "Chess Quiz" do before do @board = [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]] @excel_board = [[:a, 1], [:a, 2], [:a, 3], [:b, 1], [:b, 2], [:b, 3], [:c, 1], [:c, 2], [:c, 3]] @board_by_col = [[[0, 0], [0, 1], [0, 2]], [[1, 0], [1, 1], [1, 2]], [[2, 0], [2, 1], [2, 2]]] @board_by_row = [[[0, 0], [1, 0], [2, 0]], [[0, 1], [1, 1], [2, 1]], [[0, 2], [1, 2], [2, 2]]] @col1 = [[0, 0], [0, 1], [0, 2]] @col2 = [[1, 0], [1, 1], [1, 2]] @col3 = [[2, 0], [2, 1], [2, 2]] @piece_combinations = [[[0, 0], [0, 1]], [[0, 0], [0, 2]], [[0, 0], [1, 0]], [[0, 0], [1, 1]], [[0, 0], [1, 2]], [[0, 0], [2, 0]], [[0, 0], [2, 1]], [[0, 0], [2, 2]], [[0, 1], [0, 2]], [[0, 1], [1, 0]], [[0, 1], [1, 1]], [[0, 1], [1, 2]], [[0, 1], [2, 0]], [[0, 1], [2, 1]], [[0, 1], [2, 2]], [[0, 2], [1, 0]], [[0, 2], [1, 1]], [[0, 2], [1, 2]], [[0, 2], [2, 0]], [[0, 2], [2, 1]], [[0, 2], [2, 2]], [[1, 0], [1, 1]], [[1, 0], [1, 2]], [[1, 0], [2, 0]], [[1, 0], [2, 1]], [[1, 0], [2, 2]], [[1, 1], [1, 2]], [[1, 1], [2, 0]], [[1, 1], [2, 1]], [[1, 1], [2, 2]], [[1, 2], [2, 0]], [[1, 2], [2, 1]], [[1, 2], [2, 2]], [[2, 0], [2, 1]], [[2, 0], [2, 2]], [[2, 1], [2, 2]]] @pieces = [:rook , :bishop, :queen] @captures = [[:rook, :bishop], [:rook, :queen], [:bishop, :rook], [:bishop, :queen], [:queen, :rook], [:queen, :bishop]] @bishops = [[:rook, :bishop], [:bishop, :rook], [:bishop, :queen], [:queen, :bishop]] @remains = [[:rook, :queen], [:queen, :rook]] @moves = [[:rook, :rook], [:rook, :bishop], [:rook, :queen], [:bishop, :bishop], [:bishop, :queen], [:queen, :queen]] end it "q1" do q1([0,1,2]).should eql @board end it "q2" do q2([:a,:b,:c],[1,2,3]).should eql @excel_board end it "q3" do q3(@board).should eql @board_by_col end it "q4" do q4(@board).should eql @board_by_row end it "q5" do q5(@board_by_col).should eql @board_by_row end it "q6" do q6(@board_by_col).should eql @board_by_row end it "q7" do q7(@board).should eql @piece_combinations end it "q8" do q8(@pieces).should eql @captures end it "q9" do bishops, remains = q9(@captures) bishops.should eql @bishops remains.should eql @remains end it "q10" do q10(@pieces).should eql @moves end end
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