85 lines
3.5 KiB
Plaintext
85 lines
3.5 KiB
Plaintext
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Advent of Code
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br0xen 40*
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• [About]
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• [Stats]
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• [Leaderboard]
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• [Settings]
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• [Log out]
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--- Day 6: Probably a Fire Hazard ---
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Because your neighbors keep defeating you in the holiday house decorating contest year after
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year, you've decided to deploy one million lights in a 1000x1000 grid.
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Furthermore, because you've been especially nice this year, Santa has mailed you instructions
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on how to display the ideal lighting configuration.
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Lights in your grid are numbered from 0 to 999 in each direction; the lights at each corner are
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at 0,0, 0,999, 999,999, and 999,0. The instructions include whether to turn on, turn off, or
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toggle various inclusive ranges given as coordinate pairs. Each coordinate pair represents
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opposite corners of a rectangle, inclusive; a coordinate pair like 0,0 through 2,2 therefore
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refers to 9 lights in a 3x3 square. The lights all start turned off.
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To defeat your neighbors this year, all you have to do is set up your lights by doing the
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instructions Santa sent you in order.
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For example:
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• turn on 0,0 through 999,999 would turn on (or leave on) every light.
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• toggle 0,0 through 999,0 would toggle the first line of 1000 lights, turning off the ones
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that were on, and turning on the ones that were off.
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• turn off 499,499 through 500,500 would turn off (or leave off) the middle four lights.
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After following the instructions, how many lights are lit?
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Your puzzle answer was 377891.
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--- Part Two ---
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You just finish implementing your winning light pattern when you realize you mistranslated
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Santa's message from Ancient Nordic Elvish.
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The light grid you bought actually has individual brightness controls; each light can have a
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brightness of zero or more. The lights all start at zero.
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The phrase turn on actually means that you should increase the brightness of those lights by 1.
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The phrase turn off actually means that you should decrease the brightness of those lights by
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1, to a minimum of zero.
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The phrase toggle actually means that you should increase the brightness of those lights by 2.
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What is the total brightness of all lights combined after following Santa's instructions?
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For example:
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• turn on 0,0 through 0,0 would increase the total brightness by 1.
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• toggle 0,0 through 999,999 would increase the total brightness by 2000000.
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Your puzzle answer was 14110788.
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Both parts of this puzzle are complete! They provide two gold stars: **
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At this point, you should return to your advent calendar and try another puzzle.
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If you still want to see it, you can get your puzzle input.
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You can also [Shareon Twitter Google+ Reddit] this puzzle.
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References
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Visible links
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. http://adventofcode.com/
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. http://adventofcode.com/about
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. http://adventofcode.com/stats
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. http://adventofcode.com/leaderboard
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. http://adventofcode.com/settings
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. http://adventofcode.com/auth/logout
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. http://adventofcode.com/
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. http://adventofcode.com/day/6/input
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. 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
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. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F6
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. 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
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