2019 day 8 init

2019/day08/README.org

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+** --- Day 8: Space Image Format ---
+The Elves' spirits are lifted when they realize you have an opportunity
+to reboot one of their Mars rovers, and so they are curious if you would
+spend a brief sojourn on Mars. You land your ship near the rover.
+
+When you reach the rover, you discover that it's already in the process
+of rebooting! It's just waiting for someone to enter a
+[[https://en.wikipedia.org/wiki/BIOS][BIOS]] password. The Elf
+responsible for the rover takes a picture of the password (your puzzle
+input) and sends it to you via the Digital Sending Network.
+
+Unfortunately, images sent via the Digital Sending Network aren't
+encoded with any normal encoding; instead, they're encoded in a special
+Space Image Format. None of the Elves seem to remember why this is the
+case. They send you the instructions to decode it.
+
+Images are sent as a series of digits that each represent the color of a
+single pixel. The digits fill each row of the image left-to-right, then
+move downward to the next row, filling rows top-to-bottom until every
+pixel of the image is filled.
+
+Each image actually consists of a series of identically-sized /layers/
+that are filled in this way. So, the first digit corresponds to the
+top-left pixel of the first layer, the second digit corresponds to the
+pixel to the right of that on the same layer, and so on until the last
+digit, which corresponds to the bottom-right pixel of the last layer.
+
+For example, given an image =3= pixels wide and =2= pixels tall, the
+image data =123456789012= corresponds to the following image layers:
+
+#+BEGIN_EXAMPLE
+  Layer 1: 123
+           456
+
+  Layer 2: 789
+           012
+#+END_EXAMPLE
+
+The image you received is /=25= pixels wide and =6= pixels tall/.
+
+To make sure the image wasn't corrupted during transmission, the Elves
+would like you to find the layer that contains the /fewest =0= digits/.
+On that layer, what is /the number of =1= digits multiplied by the
+number of =2= digits?/
+
+To begin, [[file:8/input][get your puzzle input]].
+
+Answer:
+
+You can also [Shareon
+[[https://twitter.com/intent/tweet?text=%22Space+Image+Format%22+%2D+Day+8+%2D+Advent+of+Code+2019&url=https%3A%2F%2Fadventofcode%2Ecom%2F2019%2Fday%2F8&related=ericwastl&hashtags=AdventOfCode][Twitter]]
+[[javascript:void(0);][Mastodon]]] this puzzle.