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Solutions for 2022, as well as 2015-2018 and 2019 up to day 11

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Chris Alge 2023-03-12 15:20:02 +01:00
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8
2015/day08-matchsticks/Cargo.toml Normal file
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[package]
name = "day08-matchsticks"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]

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2015/day08-matchsticks/challenge.txt Normal file
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\--- Day 8: Matchsticks ---
----------
Space on the sleigh is limited this year, and so Santa will be bringing his list as a digital copy. He needs to know how much space it will take up when stored.
It is common in many programming languages to provide a way to escape special characters in strings. For example, [C](https://en.wikipedia.org/wiki/Escape_sequences_in_C), [JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String), [Perl](http://perldoc.perl.org/perlop.html#Quote-and-Quote-like-Operators), [Python](https://docs.python.org/2.0/ref/strings.html), and even [PHP](http://php.net/manual/en/language.types.string.php#language.types.string.syntax.double) handle special characters in very similar ways.
However, it is important to realize the difference between the number of characters *in the code representation of the string literal* and the number of characters *in the in-memory string itself*.
For example:
* `""` is `2` characters of code (the two double quotes), but the string contains zero characters.
* `"abc"` is `5` characters of code, but `3` characters in the string data.
* `"aaa\"aaa"` is `10` characters of code, but the string itself contains six "a" characters and a single, escaped quote character, for a total of `7` characters in the string data.
* `"\x27"` is `6` characters of code, but the string itself contains just one - an apostrophe (`'`), escaped using hexadecimal notation.
Santa's list is a file that contains many double-quoted string literals, one on each line. The only escape sequences used are `\\` (which represents a single backslash), `\"` (which represents a lone double-quote character), and `\x` plus two hexadecimal characters (which represents a single character with that ASCII code).
Disregarding the whitespace in the file, what is *the number of characters of code for string literals* minus *the number of characters in memory for the values of the strings* in total for the entire file?
For example, given the four strings above, the total number of characters of string code (`2 + 5 + 10 + 6 = 23`) minus the total number of characters in memory for string values (`0 + 3 + 7 + 1 = 11`) is `23 - 11 = 12`.
Your puzzle answer was `1333`.
\--- Part Two ---
----------
Now, let's go the other way. In addition to finding the number of characters of code, you should now *encode each code representation as a new string* and find the number of characters of the new encoded representation, including the surrounding double quotes.
For example:
* `""` encodes to `"\"\""`, an increase from `2` characters to `6`.
* `"abc"` encodes to `"\"abc\""`, an increase from `5` characters to `9`.
* `"aaa\"aaa"` encodes to `"\"aaa\\\"aaa\""`, an increase from `10` characters to `16`.
* `"\x27"` encodes to `"\"\\x27\""`, an increase from `6` characters to `11`.
Your task is to find *the total number of characters to represent the newly encoded strings* minus *the number of characters of code in each original string literal*. For example, for the strings above, the total encoded length (`6 + 9 + 16 + 11 = 42`) minus the characters in the original code representation (`23`, just like in the first part of this puzzle) is `42 - 23 = 19`.
Your puzzle answer was `2046`.
Both parts of this puzzle are complete! They provide two gold stars: \*\*
At this point, all that is left is for you to [admire your Advent calendar](/2015).
If you still want to see it, you can [get your puzzle input](8/input).

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2015/day08-matchsticks/src/lib.rs Normal file
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pub fn run(input: &str) -> (usize, usize) {
let first = input.lines().map(get_decoding_overhead).sum();
let second = input.lines().map(get_encoding_overhead).sum();
(first, second)
}
fn get_decoding_overhead(line: &str) -> usize {
let mut rendered_len = 0;
let mut literal = true;
for c in line.chars() {
match c {
'"' => {
if !literal {
rendered_len += 1;
literal = true;
}
},
'\\' => {
if !literal {
rendered_len += 1;
}
literal = !literal;
},
'x' => {
if literal {
rendered_len += 1;
} else {
rendered_len -= 1;
literal = true;
}
},
_ => rendered_len += 1
};
}
line.chars().count() - rendered_len as usize
}
fn get_encoding_overhead(line: &str) -> usize {
2 + line.matches('"').count() + line.matches('\\').count()
}
#[cfg(test)]
mod tests {
use super::*;
use std::fs::read_to_string;
fn read_file(name: &str) -> String {
read_to_string(name).expect(&format!("Unable to read file: {}", name)[..])
}
#[test]
fn test_sample() {
let sample_input = read_file("tests/sample_input");
assert_eq!(run(&sample_input), (12, 19));
}
#[test]
fn test_challenge() {
let challenge_input = read_file("tests/challenge_input");
assert_eq!(run(&challenge_input), (1333, 2046));
}
}

300
2015/day08-matchsticks/tests/challenge_input Normal file
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"sjdivfriyaaqa\xd2v\"k\"mpcu\"yyu\"en"
"vcqc"
"zbcwgmbpijcxu\"yins\"sfxn"
"yumngprx"
"bbdj"
"czbggabkzo\"wsnw\"voklp\"s"
"acwt"
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"ugvsgfv"
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"kexh\"pmi"
"syvugow"
"m\"ktqnw"
"yrbajyndte\\rm"
"f\"kak\x70sn\xc4kjri"
"yxthr"
"alvumfsjni\"kohg"
"trajs\x5brom\xf1yoijaumkem\"\"tahlzs"
"\"oedr\"pwdbnnrc"
"qsmzhnx\""
"\"msoytqimx\\tbklqz"
"mjdfcgwdshrehgs"
"\"rivyxahf\""
"ciagc\x04bp"
"xkfc"
"xrgcripdu\x4c\xc4gszjhrvumvz\"mngbirb"
"gvmae\"yiiujoqvr\"mkxmgbbut\"u"
"ih"
"ncrqlejehs"
"mkno\x43pcfdukmemycp"
"uanzoqxkpsksbvdnkji\"feamp"
"axoufpnbx\\ao\x61pfj\"b"
"dz\\ztawzdjy"
"ihne\"enumvswypgf"
"\"dgazthrphbshdo\\vuqoiy\""
"dlnmptzt\\zahwpylc\\b\"gmslrqysk"
"mhxznyzcp"
"rebr\"amvxw\x5fmbnfpkkeghlntavj"
"lades\x47ncgdof\"\"jmbbk"
"dwxuis\xa5wdkx\\z\"admgnoddpgkt\\zs"
"g\\k\x27qsl\x34hwfglcdxqbeclt\xca\\"
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"c\"uxabbgorrpprw\"xas\\vefkxioqpt"
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"onxnwykrba"
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"mfqeu"
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"k\"vtg"
"exhrtdugeml\xf0"
"behnchkpld"
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"rlvjy"
"awe"
"ctwy"
"vt"
"\x54t"
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"oj"
"xazanf\"wbmcrn"
"\\\\zkisyjpbzandqikqjqvee"
"dpsnbzdwnxk\\v"
"sj\"tuupr\\oyoh"
"myvkgnw\x81q\xaaokt\\emgejbsyvxcl\\\xee"
"ejeuqvunjcirdkkpt\"nlns"
"twmlvwxyvfyqqzu"
"\"xwtzdp\x98qkcis\"dm\\\"ep\"xyykq"
"vvcq\\expok"
"wgukjfanjgpdjb"
"\"mjcjajnxy\\dcpc"
"wdvgnecw\\ab\x44klceduzgsvu"
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"\"xj\"\x66qofsqzkoah"
"nptiwwsqdep"
"gsnlxql\x30mjl"
"yeezwokjwrhelny\""
"bjauamn\\izpmzqqasid"
"tvjdbkn\"tiziw\x82r"
"w"
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"vwxtnlvaaasyruykgygrvpiopzygf\"vq"
"qdancvnvmhlmpj\\isdxs"
"xzc\\elw"
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"yomlvvjdbngz\"rly\"afr"
"bfb\"x\"aweuwbwmoa\x13\"t\"zhr"
"\"dmfoxb\"qvpjzzhykt\xd2\"\"ryhxi"
"psqef\"yu\\qiflie\"\x79w"
"arzewkej\"lqmh\\sayyusxxo\\"
"vuvvp"
"hc\"lg\x6bcpupsewzklai\"l"
"cjdfygc\"auorqybnuqghsh\x10"
"j"
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"dws\"ru\"dvxfiwapif\"oqwzmle"
"agcykg\\jt\\vzklqjvknoe"
"kksd\"jmslja\\z\"y\\b\xaagpyojct"
"nnpipxufvbfpoz\"jno"
"dtw"
"xlolvtahvgqkx\\dgnhj\\spsclpcxv\\"
"mxea\\mbjpi"
"lgbotkk\"zmxh\\\\qji\"jszulnjsxkqf"
"lwckmhwhx\"gmftlb\x91am"
"xxdxqyxth"
"\"lmqhwkjxmvayxy"
"tf"
"qy"
"wdqmwxdztax\"m\"\x09\x11xdxmfwxmtqgwvf"
"\xcbnazlf\"ghziknszmsrahaf"
"e\x6aupmzhxlvwympgjjpdvo\"kylfa"
"\x81vhtlillb\xactgoatva"
"dvnlgr"
"f"
"xg\xfacwizsadgeclm"
"vnnrzbtw\"\\prod\\djbyppngwayy\""
"lrt\xf4jahwvfz"
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"\"\"tyowzc\\fycbp\"jbwrbvgui"
"cbpcabqkdgzmpgcwjtrchxp"
"iyrzfh\x45gw\"fdlfpiaap\x31xqq"
"evgksznidz"
"b\\w\\"
"loufizbiy\x57aim\"bgk"
"qjfyk"
"g\"anmloghvgr\x07zwqougqhdz"
"usbbmwcxd\\bdgg"
"htitqcpczml"
"eke\\cqvpexqqk\"to\"tqmljrpn\xe6lji\""
"g\xd2ifdsej"
"h\"sk\"haajajpagtcqnzrfqn\xe6btzo"
"wfkuffdxlvm\\cvlyzlbyunclhmpp"
"myaavh\"spue"
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"s\"qd\"oyxxcglcdnuhk"
"ilqvar"
"srh"
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"yywlbutufzysbncw\\nqsfbhpz\"mngjq"
"zbl\\jfcuop"
"hjdouiragzvxsqkreup\\"
"qi"
"ckx\\funlj\xa7ahi"
"k"
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"cqv\"bgjozjj\x60x\xa8yhvmdvutchjotyuz"
"hkuiet\"oku\x8cfhumfpasl"
"\"\\sbe\x4d"
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"kki\x3ewcefkgtjap\"xtpxh\"lzepoqj"
"wvtk"
"\"ynet"
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"ocowhxlx\xe6zqg\x63wx\\tclkhq\\vmaze"
"w\"cf"
"qpniprnrzrnvykghqnalr"
"jctcqra\"\x05dhlydpqamorqjsijt\\xjdgt"
"sig"
"qhlbidbflwxe\"xljbwls\x20vht"
"irmrebfla\xefsg\"j"
"nep"
"hjuvsqlizeqobepf"
"guzbcdp\"obyh"
"\"mjagins\xf9tqykaxy\""
"knvsdnmtr\"zervsb"
"hzuy"
"zza\"k\"buapb\\elm\xfeya"
"lrqar\"dfqwkaaqifig\"uixjsz"
"\"azuo\x40rmnlhhluwsbbdb\x32pk\\yu\"pbcf"
"dplkdyty"
"rfoyciebwlwphcycmguc"
"ivnmmiemhgytmlprq\\eh"
"lhkyzaaothfdhmbpsqd\\yyw"
"tnlzifupcjcaj"
"\\qiyirsdrfpmu\\\x15xusifaag"
"\\lcomf\\s"
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"n\xefai"
"\"toy\"bnbpevuzoc\"muywq\"gz\"grbm"
"\"muu\\wt"
"\\srby\"ee"
"erf\"gvw\"swfppf"
"pbqcgtn\"iuianhcdazfvmidn\\nslhxdf"
"uxbp"
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"nulscgcewj\\dvoyvhetdegzhs\""
"masv\"k\\rzrb"
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"fid\\otpkgjlh\"qgsvexrckqtn\xf4"
"tagzu"
"bvl\\\"noseec"
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"sxp"
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"uks\"\"jxvyvfezz\"aynxoev\"cuoav"
"m"
"lkvokj"
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"pbe"
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"\"aglg"
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"djja\\wcdn\"svkrgpqn\"uz\"hc\x43hj"
"cbjm"
"pnn"
"pqvh\"noh"
"\"\\fdktlp"
"ncea"
"pqgzphiyy"
"\xbedovhxuipaohlcvkwtxwmpz\"ckaif\"r"
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"c"
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"iefheu\"uru\""
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"twaailoypu\"oas\"kpuuyedlaw\\\xb0vzt"
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"gan\"y"
"p\"bevidoazcznr\"hddxuuq\""
"bwzucczznutbxe"
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"vr\"hltmfrge"
"eonf\"nt\\wtcnsocs"
"j\xb7xoslyjeyjksplkqixncgkylkw"
"njw\"pefgfbez\x9axshdmplxzquqe"
"di\x58bvptfsafirpc"
"l\x1fkco"
"x"
"mprndo\"n"
"psegit"
"svbdnkkuuqs\"sqxu\"oqcyz\"aizashk"
"cwkljukxer\\\"\\nff\"esjwiyaoy"
"ilxrkgbjjxpvhdtq\"cpiuoofdnkpp"
"hlngi\"ulxep\\qohtmqnqjb\"rkgerho"
"gxws\"bcgm\"p"
"bv\"mds\\zhfusiepgrz\\b\x32fscdzz"
"l\xfampwtme\x69qvxnx\"\"\xc4jruuymjxrpsv"
"qqmxhrn"
"xziq\\\x18ybyv\x9am\"neacoqjzytertisysza"
"aqcbvlvcrzceeyx\\j\"\"x"
"yjuhhb"
"\x5em\"squulpy"
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"utsgfkm\\vbftjknlktpthoeo"
"ccxjgiocmuhf\"ycnh"
"lltj\"kbbxi"

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""
"abc"
"aaa\"aaa"
"\x27"