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# for C(3, 1) it should returns %w(100 010 001)

def get_combinations (n, m)
  (n.downto 1).to_a.combination(m).map do |c|
    c.inject(0){ |s, k| s |= (1 << k-1) }.to_s(2).rjust(n, '0')
  end
end

puts get_combinations(10, 5)

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#!/usr/bin/env ruby
# encoding: utf-8

require 'RMagick'
include Magick

image = Image.read("image.png").first

text = Draw.new
text.annotate(image, 0, 0, 0, 60, "測試！Test!") {

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#!/usr/bin/env python
#-*- encoding: utf8

# sudo easy_install PIL

import Image
import ImageFont
import ImageDraw

image = Image.open("image.png")

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class Kirsch
  require 'RMagick'
  include Magick

  @@kernel = [
    5,  5, -3,  5,  0, -3, -3, -3, -3,
    5,  5,  5, -3,  0, -3, -3, -3, -3,
   -3,  5,  5, -3,  0,  5, -3, -3, -3,
   -3, -3,  5, -3,  0,  5, -3, -3,  5,
    0,  0,  0,  0,  0,  0,  0,  0,  0,

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class Sobel
  require 'RMagick'
  include Magick

  @@kernels = {
    :up => [1, 2, 1, 0, 0, 0, -1, -2, -1],
    :down => [-1, -2, -1, 0, 0, 0, 1, 2, 1],
    :left => [1, 0, -1, 2, 0, -2, 1, 0, -1],
    :right => [-1, 0, 1, -2, 0, 2, -1, 0, 1]
  }

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#include <security/pam_modules.h>
#include <security/pam_appl.h>
#include <sys/types.h>
#include <gcrypt.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#define SERVER_SECRET "MY_SECRET"

void gen_otp (char **otp) {

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/* 引入 Win32 API 中的 User32.DLL
 * 需要加上 using System.Runtime.InteropServices;
 */
[DllImport("user32.dll")]
public static extern Boolean GetWindowRect(IntPtr hWnd, ref Rectangle bounds);

public void CaptureWindow () {
  /* 取得目標視窗的 Handle
   * 需要加上 using System.Diagnostics;
   */

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<% uuid = (rand * 1e10).floor %>
<script type="text/javascript">
  var timer;
  var elapsed;
  function update_progress() {
    elapsed += 1;
    jQuery.ajax({
    type: "GET",
    url: "/progress",
    dataType: "json",

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// copyed from "iPhone Developer's Cookbook", Addison-Wesley 2009

#import <UIKit/UIKit.h>

@interface HelloWorldViewController : UIViewController
@end

@implementation HelloWorldViewController
- (void) loadView
{

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#!/usr/bin/ruby
require 'net/http'
require 'uri'

if ARGV.length < 1 then
  puts "Usage: ./paste2plurk.rb [filename] ... "
  exit
end

def get_language (filename)