85 lines
3.5 KiB
Plaintext
85 lines
3.5 KiB
Plaintext
Advent of Code
|
||
|
||
br0xen 40*
|
||
|
||
• [About]
|
||
• [Stats]
|
||
• [Leaderboard]
|
||
• [Settings]
|
||
• [Log out]
|
||
|
||
--- 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.
|
||
|
||
You can also [Shareon Twitter Google+ Reddit] this puzzle.
|
||
|
||
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
|
||
. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Probably+a+Fire+Hazard%22+%2D+Day+6+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F6&related=ericwastl&hashtags=AdventOfCode
|
||
. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F6
|
||
. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F6&title=I%27ve+completed+%22Probably+a+Fire+Hazard%22+%2D+Day+6+%2D+Advent+of+Code
|