62 lines
2.4 KiB
Plaintext
62 lines
2.4 KiB
Plaintext
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 4: The Ideal Stocking Stuffer ---
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Santa needs help mining some AdventCoins (very similar to bitcoins) to use as gifts for all the
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economically forward-thinking little girls and boys.
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To do this, he needs to find MD5 hashes which, in hexadecimal, start with at least five zeroes.
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The input to the MD5 hash is some secret key (your puzzle input, given below) followed by a
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number in decimal. To mine AdventCoins, you must find Santa the lowest positive number (no
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leading zeroes: 1, 2, 3, ...) that produces such a hash.
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For example:
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• If your secret key is abcdef, the answer is 609043, because the MD5 hash of abcdef609043
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starts with five zeroes (000001dbbfa...), and it is the lowest such number to do so.
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• If your secret key is pqrstuv, the lowest number it combines with to make an MD5 hash
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starting with five zeroes is 1048970; that is, the MD5 hash of pqrstuv1048970 looks like
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000006136ef....
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Your puzzle answer was 282749.
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--- Part Two ---
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Now find one that starts with six zeroes.
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Your puzzle answer was 9962624.
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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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Your puzzle input was yzbqklnj.
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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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. https://en.wikipedia.org/wiki/Bitcoin#Mining
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. https://en.wikipedia.org/wiki/Bitcoin
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. https://en.wikipedia.org/wiki/MD5
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. https://en.wikipedia.org/wiki/Hexadecimal
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. http://adventofcode.com/
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. https://twitter.com/intent/tweet?text=I%27ve+completed+%22The+Ideal+Stocking+Stuffer%22+%2D+Day+4+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F4&related=ericwastl&hashtags=AdventOfCode
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. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F4
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. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F4&title=I%27ve+completed+%22The+Ideal+Stocking+Stuffer%22+%2D+Day+4+%2D+Advent+of+Code
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