83 lines
2.9 KiB
Plaintext
83 lines
2.9 KiB
Plaintext
Advent of Code
|
||
|
||
--- Day 6: Probably a Fire Hazard ---
|
||
|
||
Because your neighbors keep defeating you in the holiday house decorating
|
||
contest year after year, you've decided to deploy one million lights in a
|
||
1000x1000 grid.
|
||
|
||
Furthermore, because you've been especially nice this year, Santa has mailed
|
||
you instructions on how to display the ideal lighting configuration.
|
||
|
||
Lights in your grid are numbered from 0 to 999 in each direction; the lights
|
||
at each corner are at 0,0, 0,999, 999,999, and 999,0. The instructions
|
||
include whether to turn on, turn off, or toggle various inclusive ranges
|
||
given as coordinate pairs. Each coordinate pair represents opposite corners
|
||
of a rectangle, inclusive; a coordinate pair like 0,0 through 2,2 therefore
|
||
refers to 9 lights in a 3x3 square. The lights all start turned off.
|
||
|
||
To defeat your neighbors this year, all you have to do is set up your lights
|
||
by doing the instructions Santa sent you in order.
|
||
|
||
For example:
|
||
|
||
• turn on 0,0 through 999,999 would turn on (or leave on) every light.
|
||
|
||
• toggle 0,0 through 999,0 would toggle the first line of 1000 lights,
|
||
turning off the ones that were on, and turning on the ones that were off.
|
||
|
||
• turn off 499,499 through 500,500 would turn off (or leave off) the
|
||
middle four lights.
|
||
|
||
After following the instructions, how many lights are lit?
|
||
|
||
Your puzzle answer was 377891.
|
||
|
||
--- Part Two ---
|
||
|
||
You just finish implementing your winning light pattern when you realize you
|
||
mistranslated Santa's message from Ancient Nordic Elvish.
|
||
|
||
The light grid you bought actually has individual brightness controls; each
|
||
light can have a brightness of zero or more. The lights all start at zero.
|
||
|
||
The phrase turn on actually means that you should increase the brightness of
|
||
those lights by 1.
|
||
|
||
The phrase turn off actually means that you should decrease the brightness
|
||
of those lights by 1, to a minimum of zero.
|
||
|
||
The phrase toggle actually means that you should increase the brightness of
|
||
those lights by 2.
|
||
|
||
What is the total brightness of all lights combined after following Santa's
|
||
instructions?
|
||
|
||
For example:
|
||
|
||
• turn on 0,0 through 0,0 would increase the total brightness by 1.
|
||
|
||
• toggle 0,0 through 999,999 would increase the total brightness by
|
||
2000000.
|
||
|
||
Your puzzle answer was 14110788.
|
||
|
||
Both parts of this puzzle are complete! They provide two gold stars: **
|
||
|
||
At this point, you should return to your advent calendar and try another
|
||
puzzle.
|
||
|
||
If you still want to see it, you can get your puzzle input.
|
||
|
||
References
|
||
|
||
Visible links
|
||
. http://adventofcode.com/
|
||
. http://adventofcode.com/about
|
||
. http://adventofcode.com/stats
|
||
. http://adventofcode.com/leaderboard
|
||
. http://adventofcode.com/settings
|
||
. http://adventofcode.com/auth/logout
|
||
. http://adventofcode.com/
|
||
. http://adventofcode.com/day/6/input
|