Bernardo Botelho bbotelho3

## Convert a PDF file to black and white (not grayscale)
# The first approach that I found was to convert using a virtual device using Ghostscript.
# The virtual device, pdfwrite, supports parameters to convert the original PDF file to another PDF file in grayscale.
# In my case, I wanted only black and white, so this was not enough.

#!/bin/bash

gs \
 -sOutputFile=output.pdf \
 -sDEVICE=pdfwrite \
 -sColorConversionStrategy=Gray \

## Solution to Problem of the Day (2014-08-22)
http://problemotd.com/problem/2-equals-1/

In the fifth step, both sides are divided by (a - b).
Since a = b, (a - b) is equal to 0, resulting in a 0/0 division.
0/0 is indetermined, therefore the fifth step is not valid.

## Solution to Problem of the Day (2014-08-21)
# http://www.problemotd.com/problem/bit-counter/
(1..100).each {|n| puts n[1] == 1}

## Exemplo de botão de login do Facebook
<html>
<body>
   <script>
      function alert_b() {

        top.location="http://google.com.br";
      }

      window.fbAsyncInit = function() {
        FB.init({
	# The first approach that I found was to convert using a virtual device using Ghostscript.
	# The virtual device, pdfwrite, supports parameters to convert the original PDF file to another PDF file in grayscale.
	# In my case, I wanted only black and white, so this was not enough.

	#!/bin/bash

	gs \
	-sOutputFile=output.pdf \
	-sDEVICE=pdfwrite \
	-sColorConversionStrategy=Gray \
	http://problemotd.com/problem/2-equals-1/

	In the fifth step, both sides are divided by (a - b).
	Since a = b, (a - b) is equal to 0, resulting in a 0/0 division.
	0/0 is indetermined, therefore the fifth step is not valid.
	# http://www.problemotd.com/problem/bit-counter/
	(1..100).each {\|n\| puts n[1] == 1}
	<html>
	<body>
	<script>
	function alert_b() {

	top.location="http://google.com.br";
	}

	window.fbAsyncInit = function() {
	FB.init({