Combine AoC Repos

2016/day08/problem

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+Advent of Code
+
+--- Day 8: Two-Factor Authentication ---
+
+   You come across a door implementing what you can only assume is an implementation of two-factor authentication
+   after a long game of requirements telephone.
+
+   To get past the door, you first swipe a keycard (no problem; there was one on a nearby desk). Then, it displays a
+   code on a little screen, and you type that code on a keypad. Then, presumably, the door unlocks.
+
+   Unfortunately, the screen has been smashed. After a few minutes, you've taken everything apart and figured out how
+   it works. Now you just have to work out what the screen would have displayed.
+
+   The magnetic strip on the card you swiped encodes a series of instructions for the screen; these instructions are
+   your puzzle input. The screen is 50 pixels wide and 6 pixels tall, all of which start off, and is capable of three
+   somewhat peculiar operations:
+
+     • rect AxB turns on all of the pixels in a rectangle at the top-left of the screen which is A wide and B tall.
+     • rotate row y=A by B shifts all of the pixels in row A (0 is the top row) right by B pixels. Pixels that would
+       fall off the right end appear at the left end of the row.
+     • rotate column x=A by B shifts all of the pixels in column A (0 is the left column) down by B pixels. Pixels
+       that would fall off the bottom appear at the top of the column.
+
+   For example, here is a simple sequence on a smaller screen:
+
+     • rect 3x2 creates a small rectangle in the top-left corner:
+
+ ###....
+ ###....
+ .......
+
+     • rotate column x=1 by 1 rotates the second column down by one pixel:
+
+ #.#....
+ ###....
+ .#.....
+
+     • rotate row y=0 by 4 rotates the top row right by four pixels:
+
+ ....#.#
+ ###....
+ .#.....
+
+     • rotate column x=1 by 1 again rotates the second column down by one pixel, causing the bottom pixel to wrap back
+       to the top:
+
+ .#..#.#
+ #.#....
+ .#.....
+
+   As you can see, this display technology is extremely powerful, and will soon dominate the
+   tiny-code-displaying-screen market. That's what the advertisement on the back of the display tries to convince you,
+   anyway.
+
+   There seems to be an intermediate check of the voltage used by the display: after you swipe your card, if the
+   screen did work, how many pixels should be lit?
+
+   Your puzzle answer was _____.
+
+--- Part Two ---
+
+   You notice that the screen is only capable of displaying capital letters; in the font it uses, each letter is 5
+   pixels wide and 6 tall.
+
+   After you swipe your card, what code is the screen trying to display?
+
+   Your puzzle answer was _____________.
+
+References
+
+   Visible links
+   . http://adventofcode.com/
+   . http://adventofcode.com/2016/about
+   . http://adventofcode.com/2016/support
+   . http://adventofcode.com/2016/events
+   . http://adventofcode.com/2016/settings
+   . http://adventofcode.com/2016/auth/logout
+   . http://adventofcode.com/2016
+   . http://adventofcode.com/2016
+   . http://adventofcode.com/2016/leaderboard
+   . http://adventofcode.com/2016/stats
+   . http://adventofcode.com/2016/sponsors
+   . http://adventofcode.com/2016/sponsors
+   . https://en.wikipedia.org/wiki/Multi-factor_authentication
+   . https://en.wikipedia.org/wiki/Requirement
+   . https://en.wikipedia.org/wiki/Chinese_whispers
+   . https://www.google.com/search?q=tiny+lcd&tbm=isch
+   . http://adventofcode.com/2016
+   . http://adventofcode.com/2016/day/8/input