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2024 Advent of Code Day 4 in Zig
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const std = @import("std"); | |
const haystack = [_][]const u8{ "AAMXMSMMMSMMSSMMXMASMAMXXMAMAMXXMASMXMXXMMMXMMXMAMXMXSMMMXMXSAMXSASXMAMXAMAMXSXSSSMXXMASAMMMMASXMAMXAMXAXMASXMASAMXSSMMSAMXAXXAMMXXXXSMAAMAM", "SMSSMMMAAMAAAAAXMAXAMAMXASXSSMMSMMAXAXXASAXAAXSMMSAMMAAASXSASASAMXMMSAMXMMAMMMAMMAMAXMXXMMSAMMSASASASASAXMMXXMASXMASAAAMAMXXMAMXMMMXXAMXXMAA", "MAAAAXSMSSMMSXMMXMSSSMMXMAXAXSAXASMXMMSMMASMSMXAASAMAMMMXAMASMMAMXMASASAASAMAMAMSAMSXSSMSXXAXAXAMASAMAAXMMAMXSAXMXMSMMMSSMAASMSMAXAASAMMSSMS", "MMMSMMMAMAXAMXMSAMAMAMMSXMXMMMXMMMMAAMMXMMMXAMMSMSMMXSAMMAMAMASXMAMXSMMMMSAXXSSXXASXMXSMXASXMSMSMXMAMSMSMXAMMMAXMAAXAMAAAMSMAAAMAMSMMAAAMAMX", "SXXXXXMAMSASAXMAXMASMMAMAXMXASMSMAMSMSMAXSASMMAAAMMMASAXSAMMSAMAXMXAXXMAMMAMXMMMSSMAMAMMMMMXAAAAMAMAMAAXMXASAMXASMSXAMMMSMAMMSMMXXXASMMXSAMX", "XAMMMSSSSXAMMMSAMMXMMMAMMMAMSAAAMSXXAAXAMXMMXMSSSMAMXMMMSASAMASMMSMMSMSASMAMXAMMMAAAMAXSASAMXMSMSASASMSMMSASMSSMXAXXXMXXMXMMAMXMMASAMMAMSMSS", 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"MAAMAMXAXXAAXAXAXSMXMSAMASMMMMMSAMXSAMSXMMMSMMXMAXMMMMMMMSMSASMMMSXMXAAAAXAAMXMAMMSMMMAXMAMMSMMASXMXSMMMAMSSSMAMMMXSAMXMASXMASMMMXMSMMMSAMMA", "MAMMMMXSSSSSMXSAMXMASMMMSAXXAXAMASAMAAMMMXAMAMXMAMSMSMXAAAXMASMSAXASXMMMSSSSSSMXSAMXMXXSXXMAMXMASAXAMASMSXMAAMXSXAASAMMMMMMSXMAMXMSMXAAMXMAS", "MAMAMMXAAAAMMAMAMASMSAXMMAMSMMMSXMASMSMAMMXSAMSXSAXAAXSMSSSMSMAMXSAMXMAMAMAMAAMSMMMASMAMXAMXMAMASMMMSAMAMAMSMMXMMMMSAMXMMAMXAXSASMAMMMSXMAMX", "XAXASMMMSMMMMAMASXXXXAMXMAMAAXXAAXAXMAMXXAAMASXAMMMSMMAMAMAXXMXMASAMMSXSSMAMSMMMAMSASXASAMXMSAMXSXAMXXMASAMAAMMSMXMXAMAMXMSMXMMASMMSAMXAMSMS", "SXSASXXMMMSXSSSXSMSSMASASMSMMSSSSMMSSSMSMMSMXMMMMXAMMSSMASXMSMSMASAMXAASASXXAMXMAMSXMMXXAMXAXXSSXXXSAMSASASMSMASXMMSMMASAAXMSMMMMAXSASMMMAAM", "AAMAMMMMMAXAAAXXXAAAXASMSXAXMAAXMASAXAAXMAXMMMXMAMXXAXXSASAAAAXMASXSMMSMAMSAMAXMAXXAMSSMXSXMXSMXAXXMAMMMSXMAMMASAMXAXSAXMSMXAXAMMXMSMMAASMSM", "MMMAMAAAMMMMMMMMMMSSMAXMSXMMMMSMSSMAMMMMMAMAASASXMSMMSXMXSMSMMMXXMASMXAMAMSSMMSMSXSMMAASAMAXXMASXMXMMXSAMAMAMMXSAMSMMMMSAMASMSSSMXMXMSSMSAXX", "SXMXXXSXSAAAAMXXAAXXMMSSMASXXXXMXAMMMSSXMASMMSMSAAAAASXSAXMAXAXXAMXMXXXSXMMAMSXAXAMAMSSMXSAMXMAMXAXSMAXAXXMAXXAMXMAXAAAMAMMSAAAAMAMXMAMAMMMS", "AAXSMMMASXMMXSASMSXXAAMASAMASXMMSSMAAXAXMXAAMSXSMMMMMSAMMSMMSAMSSMMMMSAMMSSMMMMMMXMAXMAXXAMXSXAXXMAMMMSMSSSSSMSSSSMSMSMSAMXMMMMMMMXMSMMMMAAA", "MSMSASMAMAMXMMMAAMMSMXSMMMSAMAAAAXSMSSMSMMSSMMAXXXXXSMMMAAAXMAXAAAMAAMAMAAXXAASASMSMSAMSMSMASXSMMSSMAXXMAAAXAAAXAAXXXXASAXMMMSASASAAAXSASMSS", "SXAXAAMSMXMAAAXMXMASAASXMAMASMMMSMMMAAXAAMMXAMXMSASMSAMXSSSXSMMSSMMMSSSMMMSSSXSASAMXMAXMAXMXMAMXAAMMMSXMMSMMMMMMSAMXAMMMMXAAAMAMAXMSMSXAXAAX", "XMMMMMMXMASXSMXXMMAMMMXAMMSAMAXXXMAMSSSSSMAXMMSASAMASXMXMAMXAAAMAXSMMXMASMAMMMMXMMMAMAMMMMMSMMMMMXSAMXMXMAXXXSXAXAMXSXXAMMSMSMSMAMXAMXMXMMMM", "MXAAAXSAMXMAAAMSMMXXAMXMMXMASMSSMSSXXMAXXMSMSASMMAMAMAMAMXMSSSMSAMXAXXMASMSMSASMMSSSSXSAMAAXAAAMAASXSXAASASXAAXMXMXAMMMMSAXAAAXMSMMAAAAAMASX", "AXSSXSASAMSSMMMSAAMSMSAMXXSAMXAAMAMSMMMMXMXXMAMAMXMMSAMAMAMXXAAMMMSMMSMMXAMAMAXXAAAXAASASXSSSMSMMXSASASXSXMMMMMMSXMMXXAAMMSXMSMAMASMMMSMSAMA", "SMAAXXMASAAXAAAXMMMAAXAXSAMXXMSMMASAXAAMSAMSMSMSMSMAXXXAXAMXXMSMSMXMAXAAMMMAMXMMMSSMMMMAMMAAXSAMXXMXMAXAMXXAAXAMXAXAASMSSXAXMXMSMAMMAMAXMAMX", "MAMAMXXAASMSSMSXSASMSMAXSXSASMMXSXSMSSXSAMXAAXAAAAMMMSSMXSSMMXAAAAXMASMMSASXSSMXAAAASAMXMSMXMMMXSAMXMXMXMASMSSSMXMMSMSAMMMSSMAXMASASAMSMSAXM", "SSSMASMMMMXAAAAASASAMMMMXMAXMAAASXMXAAXSAMXMXMSMSMXSAMAMAXAAAAMSMSMMMSAASMSMMAXMSSSMMXMAMAMSXSAAAAXASAMXMAXXXAMXXXAXMMXMAAAAXAMMXAAMXXAMXXXX", "XAAAXMASAXMSMMMMMAMXMASXSSMAMMMMSAMMMSMSASAXXMMMXXAMASAMXSAMSMXXAAMAMSMMMAMMSAMMAAXAXMAMXAXAAMMSSMMMSXSAMXSMMMMXMAMMMMASMMXSMMSXMMSSSMMSMMMX", "MSMMSSXMAXXXXXMAMXMSSMSAAAXMASMXSAMXMXAMAXXXMXAXMMXSAMXAXAXMMXAMXMSMXXXMASMAMMXMASMSMSASMSSMSMMAAAXXMASASXXAASASXSAAASASMSAAAAAAXXAAAAXAAAXX", "MXMAXMMMMSSMMMXXSMMXAASMSMMXAAAASAMXSMMMSMMXMAXSAMAMASXMMMXXAMXAAXXMASMMAMMXSMXSAXAMASMXAXXXXAMSSMMASXMASXSSMSAMAMXXMMXSAMSSMMSMMXMSMMSSSMSM", "XAMMXMAXAAAAAMSMXASXMMMXXASXMASXSXMXMASAMAXASAXXAMASAMASAXMMXMMXMSAMXMAMMSASXMASAMAMAMAMAMSMMXMAMASAMAMMMAAAXMAMSMMSSMSMMMXXMXMXSSMXAXAAAAAA", "SSMSASXMMSSMMAAAMAMAXMXASAMXMAXAMASXSMMASXSMMSMSMMXMMSAMXMSAMXSMXAAMASAMXSXMAXXXMXMMXSMAAAXSMXSASXMASXSAMXMAMXMMXAAAAXMASXSASAMAMAASXMMXMMMX", "SAASASXAXXXMMSSSXASMMSAMMMMSMXSAMAMMAAMAMAMMAMMASXAAMMMSMMMAXAXAMMMXXMAXAXAMSMMMMSXMASXSXSAMXAMXXXSMMXMXSAMASXMASMMXMMMAMASAMMMASMMMMASMSSSS", "MMAMMMMSMSMSAAAAMXMXASXXAAMASMSMMXMSSMMAMAMMASMMMXMXMAXXAASXMASMSXSXMSMMSMSMAAXAAAAMAXAASMXAMSSSMXMASAMAMAMAXAMXSSSMMAXAMXMSMASAMXXAXMAAAAAX", "SMMMXAXAAXAMMMMXSMMMXMASXMXAMXMMMAMXMXSAMAMMAXAXSXSASXMSSMSXMMAAAASMMAXXXAAXMXMMSMSMMMSMMSXXXXAAAAXAMAMSXSMSXMMSMAMASXSSSSMMXXMMSMSXSXMMMMMM", "XAMMSSSMSMMMSAXXMAXSAMMMMSMSSXMSSSSXSASMSSSMSSSXMASASAMXAAXXXAMXMAMASXXMMSMMMXMMXXXAXXXAAAXSMMSMMXMSSSMMAXAXMAMASMSXMAAMMAAXXMAXAAXAXMSXMSSM", "SSMAMXAAXAAAXMSMSSMSXSAMXXAAAAAAAMAMMAXAAAMAXSXAMAMXMAMXMMMMSMXAMXSXMMXSAMMSAASAMXMXMAXMMMXAAMMMXMXMAMXMAMAMSXSASXSMMSMASMMMXMASMSMXMASAAAAM", "SMMASXMMMXMSXXAAAMXMXSMMMMMMXMMMSMXMMSMMMSMSXMSXMSMSSSMXMXAAAXAMXXSAAAXMASAMSSMASMMSAMXSMSSSSMMXMAAMSMMMAMSMAMMMMXMXAMAMSAMXSXAXAXXXAXMMMSSM", "SASASXSXSAXAMSMSMSSMAMXASXMASXAXXXXMAMAMAXXMAXXMAMAMAXXAMXSSMXSAMASXMMXSAMMMXXMMXAAAXXMXAAMAAMXAXSAXAAMMMSAMXMAMSSMMMSSXSAMASAMSSSMMSSXMXMAM", "XMMAMXSASMSXAXAMXAXMASXMSAMXAMXXMSXMASAMASASXMMMAMAMXMMMSAMAMMMAMMMAMXXMXMXAMXAAMXAMXSASMXXSXMMSXMMSSSMMSXMAMMAMAMAXAAAAMXMAMMMAAAXAAMAXMMXA", "MSMSMAMAMXSASMSMMSSMASAASAMXSMSMXMASASASASAMMMAMXSXMAMXAMXMAMAXXXAXAMXAASMSASXMAXSAXAXMMMSMMASAMAAAAAMAXMAXXSASMMSMMMSMMSMMMSMMXSMMMSSSMMSSM", "MAAXMXMAMXXAMAMAMXXMAMMMMMMMMAAASXMMMSAMAMAMASXSXMXXASMASMSMSMSMSMSAXAMXMASASXMAMSXMXXXSAAASAXASMMMSSSMMSXMASAMXXAAXXXXAAAAXAAXAMXXAAMMAMAAX", "SMSMXAMAXXMMMMMSSMXMMMSXXAXAMSMSAMSAMMAMAXAXXXAXMAMXMSAMAXXAAAAXAMSAMSMSMAMAMXMSMMMSSXAMSSMMMXMMAXAMXAAAXAAMMXXXSXSMMXMXSMMMSSMSAAMMMMXAMSSM", "XMAASASAMSMSXXMAAAMSSXMASMSMXMMAAASXMSXMMSMSMMMSMAMASMMMMMMSMSMMXMMXMMAAMAMMMXMXAAAAMMXMAXMASAMXAMSSSSMMSXMXMXMASAXMASXAMXSAAMMMMMXMXMXMMAMX", "MSMMXMXAXSAMXSAMXSAAMMSAMXAXAXXSMMXAXSAMXAMAXAMXMSSMAAAMASXMAAXAMMMMMMXMSMSMSMMSSMMSSSSMAXXASASXSSMAMAXXXAMXSAAAMAMASAMXSAMXXXAAASXSASASMMSS", "AAMMAMSXMMAMAMAXSMMMSXSASAMSXSAMASMMMSAMSXSASMSAMXAXMSMSASAMXMSSMMAAAAAXXMXMAAMAAXMMMMAMAMMMSAMXMAMMMSMMMSMASMSAMMMMMMMAMAMMMSSSMSASASMSASAM", "SXSSXMAAXSAMXSAMXASXSAMXMAXAMAAMAMAAASMMMXMASXMASMSMAXAMASAMXXSAASMSSSSSXXASXSMSSMSAASAMAXSAXAMXSAMXAXAXAAMXSMMXAAAAAAMASAMAMAAXMXAMAMMSXMAS", "XAXMASXSMXXXXAMXSAMXMXMASXMAMSAMXSSMMXSXMASMSMSMMXMASMXMXMXAMXSSMMMXAAXXXSMSAXAMMASXMSXSAXMASMAASXMMASXMSSSMXMASXSSSSMSASMSMSMSMMMAMXMXMASAM" }; | |
fn checkLine(row: []const u8) u8 { | |
var matches: u8 = 0; | |
var i: usize = 0; | |
while (i < row.len - 3) { | |
if (row[i] == 'X') { | |
i += 1; | |
if (row[i] == 'M') { | |
i += 1; | |
if (row[i] == 'A') { | |
i += 1; | |
if (row[i] == 'S') { | |
i += 1; | |
matches += 1; | |
} | |
} | |
} | |
} else { | |
i += 1; | |
} | |
} | |
i = 0; | |
while (i < row.len - 3) { | |
if (row[i] == 'S') { | |
i += 1; | |
if (row[i] == 'A') { | |
i += 1; | |
if (row[i] == 'M') { | |
i += 1; | |
if (row[i] == 'X') { | |
i += 1; | |
matches += 1; | |
} | |
} | |
} | |
} else { | |
i += 1; | |
} | |
} | |
return matches; | |
} | |
fn checkEntireHaystack() !void { | |
var matches: u32 = 0; | |
for (0..haystack.len) |i| { | |
matches += checkLine(haystack[i]); | |
var vertical: [haystack.len]u8 = undefined; | |
for (0..haystack.len) |j| { | |
vertical[j] = haystack[j][i]; | |
} | |
matches += checkLine(&vertical); | |
var ascendingTop: [haystack.len]u8 = undefined; | |
for (0..i + 1) |j| { | |
const offset = i - j; | |
ascendingTop[j] = haystack[offset][j]; | |
} | |
matches += checkLine(&ascendingTop); | |
var descendingTop: [haystack.len]u8 = undefined; | |
var j = haystack.len; | |
while (j > i + 1) { | |
j -= 1; | |
const offset = j - i; | |
descendingTop[j] = haystack[j][offset - 1]; | |
} | |
matches += checkLine(&descendingTop); | |
} | |
var i = haystack.len - 1; | |
while (i > 0) { | |
i -= 1; | |
var ascendingBottom: [haystack.len]u8 = undefined; | |
for (0..i + 1) |j| { | |
const offset = i - j; | |
ascendingBottom[j] = haystack[haystack.len - j - 1][haystack.len - offset - 1]; | |
} | |
matches += checkLine(&ascendingBottom); | |
var descendingBottom: [haystack.len]u8 = undefined; | |
var j = haystack.len; | |
while (j > i) { | |
j -= 1; | |
const offset = j - i; | |
descendingBottom[j] = haystack[haystack.len - j - 1][haystack.len - offset - 1]; | |
} | |
matches += checkLine(&descendingBottom); | |
} | |
std.debug.print("Total matches for haystack: {d}\n", .{matches}); | |
} | |
fn checkEntireHaystackForCrossedMasses() !void { | |
var matches: u32 = 0; | |
for (1..haystack.len - 1) |i| { | |
for (1..haystack.len - 1) |j| { | |
if (haystack[i][j] == 'A') { | |
if ((haystack[i - 1][j - 1] == 'M' and haystack[i + 1][j + 1] == 'S') or (haystack[i - 1][j - 1] == 'S' and haystack[i + 1][j + 1] == 'M')) { | |
if ((haystack[i + 1][j - 1] == 'M' and haystack[i - 1][j + 1] == 'S') or (haystack[i + 1][j - 1] == 'S' and haystack[i - 1][j + 1] == 'M')) { | |
matches += 1; | |
} | |
} | |
} | |
} | |
} | |
std.debug.print("Total x-mas matches for haystack: {d}\n", .{matches}); | |
} | |
pub fn main() !void { | |
_ = try checkEntireHaystack(); | |
_ = try checkEntireHaystackForCrossedMasses(); | |
} |
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