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def min_abs_sum(a)
  n = a.size
  [1, -1].repeated_permutation(n).map do |s|
    val(a,s).abs
  end.min
end

def val(a,s)
  a.map.with_index{|e, i| a[i] * s[i]}.inject(:+)
end

thdaraujo

def cyclic_rotation(a, k)
  size = a.size
  return a if k == size || k == 0
  
  result = a.clone
  a.each_with_index{|e, i|
    result[(i + k) % size] = e
  }
  result
end

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# Returns the maximum binary gap of a number.
# e.g.: max binary gap of 529 (1000010001 in binary) is 4.
#
def max_binary_gap(n)
  return 0 if (n < 1)
  
  result = n.to_s(2).scan(/10+1/).map{|m|
    m.gsub('1', '').size
  }.select{|gap|
    gap >= 0

thdaraujo

-- see http://api.rubyonrails.org/classes/ActiveSupport/TimeZone.html MAPPING
WITH timezone_lookup(rails_timezone, pg_timezone) 
AS (
  VALUES 
  ('International Date Line West', 'Pacific/Midway'),
  ('Midway Island', 'Pacific/Midway'),
  ('American Samoa', 'Pacific/Pago_Pago'),
  ('Hawaii', 'Pacific/Honolulu'),
  ('Alaska', 'America/Juneau'),
  ('Pacific Time (US & Canada)', 'America/Los_Angeles'),

thdaraujo

pragma solidity ^0.4.17;

contract Inbox{
    string public message;
    
    function Inbox(string initialMessage) public {
        message = initialMessage;
    }
    
    function setMessage(string newMessage) public {

thdaraujo

SPC s c remove highlight

**** Files manipulations key bindings
Files manipulation commands (start with ~f~):

| Key Binding | Description                                                    |
|-------------+----------------------------------------------------------------|
| ~SPC f c~   | copy current file to a different location                      |
| ~SPC f C d~ | convert file from unix to dos encoding                         |
| ~SPC f C u~ | convert file from dos to unix encoding                         |

thdaraujo

# find the shortest knight path 
# in a game of chess on an infinite board

def knight_moves(a, b)
  ratio = a.to_f / b.to_f
  unless (((ratio >= 0.5 && ratio <= 2.0) || (ratio <= -0.5 && ratio >= -2.0)) && ((a+b)% 3 == 0))
    puts 'unreachable'
    -1
  else
    (a+b)/3

thdaraujo

#unit test
#how to run: $ ruby tc_tweetstorm.rb

require_relative "tweetstorm"
require "minitest/autorun"

class TestTweetStorm  < Minitest::Test

  def setup

thdaraujo

class Point
  attr_reader :x, :y
  def initialize(x, y)
    @x = x
    @y = y
  end
  def to_s
   "(#{@x}, #{@y})"
  end
end

thdaraujo

/* WARNING: it won`t work on your browser/development, only works on your phone! */

//sources: 
// http://stackoverflow.com/questions/27845345/ionic-cordova-camera-not-working

/* install ionic and cordova */ 
$ sudo npm install -g ionic cordova

/* create ionic app */
$ ionic start myApp