85 lines
3.9 KiB
Plaintext
85 lines
3.9 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 14: Reindeer Olympics ---
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This year is the Reindeer Olympics! Reindeer can fly at high speeds, but must rest occasionally
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to recover their energy. Santa would like to know which of his reindeer is fastest, and so he
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has them race.
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Reindeer can only either be flying (always at their top speed) or resting (not moving at all),
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and always spend whole seconds in either state.
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For example, suppose you have the following Reindeer:
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• Comet can fly 14 km/s for 10 seconds, but then must rest for 127 seconds.
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• Dancer can fly 16 km/s for 11 seconds, but then must rest for 162 seconds.
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After one second, Comet has gone 14 km, while Dancer has gone 16 km. After ten seconds, Comet
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has gone 140 km, while Dancer has gone 160 km. On the eleventh second, Comet begins resting
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(staying at 140 km), and Dancer continues on for a total distance of 176 km. On the 12th
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second, both reindeer are resting. They continue to rest until the 138th second, when Comet
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flies for another ten seconds. On the 174th second, Dancer flies for another 11 seconds.
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In this example, after the 1000th second, both reindeer are resting, and Comet is in the lead
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at 1120 km (poor Dancer has only gotten 1056 km by that point). So, in this situation, Comet
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would win (if the race ended at 1000 seconds).
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Given the descriptions of each reindeer (in your puzzle input), after exactly 2503 seconds,
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what distance has the winning reindeer traveled?
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Your puzzle answer was 2660.
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--- Part Two ---
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Seeing how reindeer move in bursts, Santa decides he's not pleased with the old scoring system.
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Instead, at the end of each second, he awards one point to the reindeer currently in the lead.
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(If there are multiple reindeer tied for the lead, they each get one point.) He keeps the
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traditional 2503 second time limit, of course, as doing otherwise would be entirely ridiculous.
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Given the example reindeer from above, after the first second, Dancer is in the lead and gets
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one point. He stays in the lead until several seconds into Comet's second burst: after the
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140th second, Comet pulls into the lead and gets his first point. Of course, since Dancer had
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been in the lead for the 139 seconds before that, he has accumulated 139 points by the 140th
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second.
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After the 1000th second, Dancer has accumulated 689 points, while poor Comet, our old champion,
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only has 312. So, with the new scoring system, Dancer would win (if the race ended at 1000
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seconds).
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Again given the descriptions of each reindeer (in your puzzle input), after exactly 2503
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seconds, how many points does the winning reindeer have?
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Your puzzle answer was 1256.
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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/14/input
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. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Reindeer+Olympics%22+%2D+Day+14+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F14&related=ericwastl&hashtags=AdventOfCode
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. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F14
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. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F14&title=I%27ve+completed+%22Reindeer+Olympics%22+%2D+Day+14+%2D+Advent+of+Code
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