Solve day 7 of AoC 2024
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advent-of-code/2024/day_07/.formatter.exs
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# Used by "mix format"
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[
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inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
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]
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advent-of-code/2024/day_07/.gitignore
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# The directory Mix will write compiled artifacts to.
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/_build/
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# If you run "mix test --cover", coverage assets end up here.
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/cover/
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# The directory Mix downloads your dependencies sources to.
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/deps/
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# Where third-party dependencies like ExDoc output generated docs.
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/doc/
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# Ignore .fetch files in case you like to edit your project deps locally.
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/.fetch
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# If the VM crashes, it generates a dump, let's ignore it too.
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erl_crash.dump
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# Also ignore archive artifacts (built via "mix archive.build").
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*.ez
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# Ignore package tarball (built via "mix hex.build").
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day_07-*.tar
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# Temporary files, for example, from tests.
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/tmp/
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advent-of-code/2024/day_07/README.md
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# Day 7: Bridge Repair
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The Historians take you to a familiar rope bridge over a river in the middle of a jungle.
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The Chief isn't on this side of the bridge, though; maybe he's on the other side?
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When you go to cross the bridge, you notice a group of engineers trying to repair it. (Apparently, it breaks pretty frequently.)
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You won't be able to cross until it's fixed.
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You ask how long it'll take; the engineers tell you that it only needs final calibrations,
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but some young elephants were playing nearby and stole all the operators from their calibration equations!
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They could finish the calibrations if only someone could determine which test values could possibly be produced
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by placing any combination of operators into their calibration equations (your puzzle input).
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For example:
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```
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190: 10 19
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3267: 81 40 27
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83: 17 5
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156: 15 6
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7290: 6 8 6 15
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161011: 16 10 13
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192: 17 8 14
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21037: 9 7 18 13
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292: 11 6 16 20
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```
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Each line represents a single equation. The test value appears before the colon on each line;
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it is your job to determine whether the remaining numbers can be combined with operators to produce the test value.
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Operators are always evaluated left-to-right, not according to precedence rules.
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Furthermore, numbers in the equations cannot be rearranged. Glancing into the jungle, you can see elephants holding
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two different types of operators: add (+) and multiply (*).
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Only three of the above equations can be made true by inserting operators:
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- 190: 10 19 has only one position that accepts an operator: between 10 and 19. Choosing + would give 29, but choosing * would give the test value (10 * 19 = 190).
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- 3267: 81 40 27 has two positions for operators. Of the four possible configurations of the operators, two cause the right side to match the test value: 81 + 40 * 27 and 81 * 40 + 27 both equal 3267 (when evaluated left-to-right)!
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- 292: 11 6 16 20 can be solved in exactly one way: 11 + 6 * 16 + 20.
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The engineers just need the total calibration result, which is the sum of the test values from just the equations that could possibly be true.
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In the above example, the sum of the test values for the three equations listed above is 3749.
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Determine which equations could possibly be true. What is their total calibration result?
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## Part Two
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The engineers seem concerned; the total calibration result you gave them is nowhere close to being within safety tolerances.
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Just then, you spot your mistake: some well-hidden elephants are holding a third type of operator.
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The concatenation operator (||) combines the digits from its left and right inputs into a single number.
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For example, 12 || 345 would become 12345. All operators are still evaluated left-to-right.
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Now, apart from the three equations that could be made true using only addition and multiplication,
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the above example has three more equations that can be made true by inserting operators:
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- 156: 15 6 can be made true through a single concatenation: 15 || 6 = 156.
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- 7290: 6 8 6 15 can be made true using 6 * 8 || 6 * 15.
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- 192: 17 8 14 can be made true using 17 || 8 + 14.
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Adding up all six test values (the three that could be made before using only + and * plus the new three that can now be made by also using ||)
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produces the new total calibration result of 11387.
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Using your new knowledge of elephant hiding spots, determine which equations could possibly be true. What is their total calibration result?
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advent-of-code/2024/day_07/input.txt
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advent-of-code/2024/day_07/input.txt
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||||||
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||||||
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||||||
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||||||
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595: 7 9 8 86 5
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49007459: 7 93 309 2 59
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||||||
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5783913: 865 4 5 12 8 816 97 1 8
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277: 45 136 93
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1788313636: 1 8 9 9 2 86 3 6 9 1 3 636
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35328: 5 4 2 8 48
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||||||
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1525221525: 8 247 7 383 769
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||||||
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7533999509: 93 9 9 999 50 9
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||||||
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274501597440: 4 8 6 62 645 376 56
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||||||
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2610116: 1 96 9 184 57 67
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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140132793856: 5 1 901 1 9 3 9 30 1 8 5 6
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27881717: 2 788 17 1 7
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56485800: 150 59 26 6 5 79 700 9
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572298805: 2 9 1 4 49 5 82 8 7 9 11
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3274949796144: 74 155 6 32 23 6 6 1 47
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677711: 66 9 1 8 712
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1864498: 1 4 401 1 82 8 7 1 66 80
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4519368: 8 7 427 3 63
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24: 5 5 7 5 2
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361285303: 715 934 541 85 8
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39897000: 590 812 309 5 930 25
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208599160: 192 28 917 11 94
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69387137: 248 7 80 69 53 39 16
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59784: 7 8 558 94
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1014910171872: 1 4 83 2 905 5 8 7 3 4 3 2
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4973794: 680 83 931 189 7
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164008: 279 7 22 1 83
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426007: 4 76 772 500 7
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1264772: 94 437 88 97 9 3 497
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||||||
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||||||
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2556820932: 4 854 828 61 84 59
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||||||
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||||||
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241011: 709 8 42 8 99
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||||||
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||||||
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265381: 188 64 3 2 8 14 79 83
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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|
||||||
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|
||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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||||||
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3050879: 3 4 33 3 8 823 7 8
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||||||
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92525: 36 7 61 6 1 61 14 212 5
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||||||
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||||||
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18465: 6 11 6 181 3
|
||||||
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||||||
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|
||||||
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||||||
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18180: 6 68 8 2 38 2 59 60
|
||||||
|
29757054381: 9 70 1 17 426 2 72
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||||||
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12704125: 30 7 8 9 354 6
|
||||||
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||||||
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1366446: 6 83 2 3 8 6 6
|
||||||
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||||||
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277868: 29 6 9 3 7 96 3 6 3 5
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||||||
|
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|
||||||
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71231084: 585 898 98 8 7 6
|
||||||
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||||||
|
6147470: 76 843 8 2 9
|
||||||
|
2678328244: 9 4 91 99 6 60 4 964 1 6
|
||||||
|
244: 8 4 95 137
|
||||||
|
20610048: 1 92 97 44 27 2 220 4 1
|
||||||
|
3736617: 92 6 364 4 253 104 1
|
||||||
|
270279903: 741 6 89 2 775 36
|
||||||
|
1902000: 6 304 7 2 40 5 3 5
|
||||||
|
4712267: 8 7 92 6 569 9 47 891
|
||||||
|
5204: 4 8 2 3 45 9 9 27 759 6 8
|
||||||
|
759015: 6 3 5 87 7 2 90 39 7 848
|
||||||
|
896813617: 97 3 3 9 9 9 2 6 6 7 547 6
|
||||||
|
7822: 8 22 44 78
|
||||||
|
39939244086: 5 8 335 4 2 638 97 9 4
|
||||||
|
1230: 78 37 1 8 10
|
||||||
|
1096017489: 72 6 3 3 942 7 4 91 171
|
||||||
|
116678: 5 233 1 73 4
|
||||||
|
160388: 1 313 512 1 131
|
||||||
|
164448789574: 65 8 5 47 2 6 3 9 3 459 3
|
||||||
|
1063936: 37 2 3 1 9 6 5 1 9 76 775
|
||||||
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53132559: 90 12 7 52 940
|
||||||
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755254858: 7 5 8 59 545 76 281
|
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2234356919011: 3 2 2 43 8 761 556 7 9 4
|
||||||
|
2121417: 61 373 181 3 51 9
|
||||||
|
381591: 67 8 25 6 673
|
||||||
|
8819132976: 54 3 68 1 6 9 159 3 2 8
|
||||||
|
2556: 5 8 128 143 9
|
||||||
|
129948: 180 5 449 3 9 68
|
||||||
|
31267993680: 75 358 7 4 495 588
|
||||||
|
1495697: 80 41 6 31 71
|
||||||
|
3791: 5 3 2 40 511
|
||||||
|
89977578: 62 533 714 164 151
|
||||||
|
321811265: 4 90 694 5 906 6 3 5 30
|
||||||
|
2202264: 18 745 1 6 61 7 9 292
|
||||||
|
228040: 30 116 13 368 5
|
||||||
|
441916: 4 9 9 4 9 9 16
|
||||||
|
34478: 677 8 5 570 2 18
|
||||||
|
479918517002: 16 722 327 9 18 650 3
|
||||||
|
1111395: 2 708 47 6 9 791 72 3
|
||||||
|
1051590893: 8 32 657 5 4 760 4 49 1
|
||||||
|
403654115: 162 640 440 65 823 5
|
||||||
|
551939995: 511 12 6 666 9
|
||||||
|
48125762: 4 2 8 5 911 78 32 1
|
||||||
|
155118270: 328 30 9 7 553 25 2 2 5
|
||||||
|
195929415: 1 399 99 124 8 9 882 5
|
||||||
|
93312359129: 3 6 662 3 9 8 1 8 5 5 5 75
|
||||||
|
8317764: 6 782 1 9 7 14 79 9 2 9 7
|
||||||
|
70199168: 9 59 17 2 862 64
|
||||||
|
199: 91 11 97
|
||||||
|
40713835: 7 70 94 9 125 17 5
|
||||||
|
4804067610: 788 6 41 3 4 254
|
||||||
|
443923336: 463 91 90 4 8 93 43
|
||||||
|
29206033927: 5 9 6 648 2 706 38 7
|
||||||
|
253866: 33 3 68 3 416 51 87
|
||||||
|
6694800: 750 47 56 150
|
||||||
|
3202: 8 4 9 3 103 730
|
||||||
|
132656121360: 7 85 19 1 8 5 5 97 9 42 8
|
||||||
|
24352278: 3 431 561 7 31 6 4 75
|
||||||
|
2396712: 91 45 476 40 37
|
||||||
|
402942728: 402 94 27 2 8
|
||||||
|
562: 18 2 42 475 9
|
||||||
|
3978788000125: 1 9 8 9 39 39 8 2 5 4 1 24
|
||||||
|
2946: 894 541 7 31 2
|
||||||
|
11019730827: 4 9 6 362 7 4 9 32 7 5 3 8
|
||||||
|
51625: 3 75 228 259 56 7
|
||||||
|
2616000: 8 8 1 2 16 4 89 17 4 9 3 8
|
||||||
|
238476846386: 2 7 1 6 710 3 29 622 5
|
||||||
|
696570: 27 8 215 13 21 2 749
|
||||||
|
4244053945: 659 4 4 8 4 268 9 6 2 2 6
|
||||||
|
11856: 8 13 507 3 6 760 7 86 5
|
||||||
|
6286: 8 1 50 5 80 5 1 177 7
|
||||||
|
745206: 281 6 21 76 4 3 7
|
||||||
|
179170: 2 943 19 1 5
|
||||||
|
93741: 54 544 60 675 6 70 6 5
|
||||||
|
1541535: 2 8 55 1 535
|
||||||
|
7784184: 767 1 96 945 87
|
||||||
|
527408412903: 9 71 977 80 39 9 167
|
||||||
|
14445336: 351 3 731 176 45 46 2
|
||||||
|
487272188: 9 938 6 3 7 5 7 7 99 6 1 8
|
||||||
|
3280685: 7 1 5 9 99 6 4 3 1 28 8 5
|
||||||
|
176745622: 96 57 646 2 2 1 5
|
||||||
|
30125: 60 6 5 91 68 4 8 1 7 8
|
||||||
|
85298610476: 94 37 36 844 57 847 6
|
||||||
|
1307051: 233 1 1 3 8 5 25 7 9 14
|
||||||
|
137979: 1 31 7 62 79 1
|
||||||
|
47462976: 7 8 56 553 8 2 33 8 4 9 1
|
||||||
|
754844698: 752 5 14 1 4 5 18 6 698
|
||||||
|
72111: 3 7 78 44 28 1 3 7
|
||||||
|
4508256030: 449 1 824 88 72 30
|
||||||
|
364280231: 603 863 10 7 95 837
|
||||||
|
3965160: 8 8 4 328 511 4 9 35 3 1
|
||||||
|
7644726: 537 2 9 62 3 162 1 513
|
||||||
|
89236397251: 8 219 25 770 141
|
||||||
|
41473455: 70 45 6 60 1 73 456
|
||||||
|
8139142603: 2 84 1 2 468 9 4 92 7 5 3
|
||||||
|
289561268303: 59 4 6 2 1 732 9 3 77 48
|
||||||
|
316135053: 13 6 855 77 3 1
|
||||||
|
131160: 4 197 9 7 7 8 55 6 9 4 5
|
||||||
|
20264832: 22 988 67 42 448
|
||||||
|
1047875584: 8 1 56 7 736 454
|
||||||
|
31317451619: 1 933 6 6 2 555 5 42 2
|
||||||
|
9684: 83 6 19 192 573
|
||||||
|
159920: 3 5 7 2 39 4 9 8 504 3
|
||||||
|
28810503200: 7 107 9 2 56 9 2 4 53 4 5
|
||||||
|
1522842: 7 6 138 6 1 979 6
|
||||||
|
8678: 8 5 3 8 18 1 1 2 27 679 7
|
||||||
|
84382: 4 40 17 633 661 6 62
|
||||||
|
485993799469: 449 994 2 135 79 34 8
|
||||||
|
31962572: 249 8 21 3 33 96 947 4
|
||||||
|
3099348: 1 94 18 58 4 28 441
|
||||||
|
365212: 866 47 5 8 9
|
||||||
|
79695525: 8 31 547 1 249 869 15
|
||||||
|
4159339: 5 6 9 3 7 5 36 2 38 2 617
|
||||||
|
575: 8 49 7
|
||||||
|
6802299: 1 3 39 9 93 3 9 7
|
||||||
|
2641: 982 4 806 849
|
||||||
|
170124: 347 61 2 193 4 4
|
||||||
|
68381369840: 6 67 4 63 110 5 8 434 7
|
||||||
|
75088640: 335 6 311 1 220
|
||||||
|
213: 49 1 80 4 17 4 58
|
||||||
|
5871618032: 302 7 3 7 952 240 646
|
||||||
|
5000502164: 91 4 7 662 303 76 39 8
|
||||||
|
41648: 25 9 443 87 8 141
|
||||||
|
161622932: 654 233 257 709 1
|
||||||
|
154450181861: 6 715 2 8 36 6 4 1 8 5 3 8
|
||||||
|
1664: 1 3 6 1 8 9 795 805 15 8
|
||||||
|
206617: 8 1 258 38 177
|
||||||
|
61799810613: 2 7 6 29 442 6 14 8 7 3 3
|
||||||
|
307: 5 94 3 3 7
|
||||||
|
50722: 1 13 5 3 689 425
|
||||||
|
3462120: 6 82 8 6 3 6 8 748 1 8 8 8
|
||||||
|
12071655: 299 287 206 55
|
||||||
|
308113457677: 79 39 13 457 679
|
||||||
|
2806671008: 3 5 2 209 6 9 9 10 7 30 8
|
||||||
|
718569388: 7 7 646 157 5 6 69 6 7 4
|
||||||
|
309226: 2 65 19 910 292
|
||||||
|
45836: 3 6 3 3 45 8 3 21 2 2 2 6
|
||||||
|
10238605: 8 2 6 39 5 48 3 4 871 1
|
||||||
|
540929791: 657 1 98 9 3 4 4 7 8 5 1 7
|
||||||
|
1819180440: 8 5 21 6 812 5 2 803
|
||||||
|
4680361654: 371 6 5 5 3 97 867 7
|
||||||
|
496333577: 2 95 40 5 624 94 3 41
|
||||||
|
1224: 3 3 1 3 2 6 5 61 9 265 2 3
|
||||||
|
2359823: 831 4 2 5 1 3 3 47 2 3 47
|
||||||
|
43895: 14 1 39 75 20
|
||||||
|
1232405374023: 4 277 70 215 3 2 670 3
|
||||||
|
308211169: 4 69 3 2 6 2 7 1 8 6 493 7
|
||||||
|
966: 5 2 4 9 226 7 590 2 1 8 7
|
||||||
|
5606560759: 5 3 129 8 6 5 8 2 67 759
|
||||||
|
1925379094485: 90 5 129 9 758 9 8 627
|
||||||
|
54389794191: 2 406 1 669 941 9 1 1
|
||||||
|
70005469: 942 17 457 56 739
|
||||||
|
122958: 3 8 4 8 29 725 510 92
|
||||||
|
31351050: 4 258 45 6 675
|
||||||
|
48886: 288 2 84 502
|
||||||
|
10348: 41 2 22 923 361
|
||||||
|
199756: 74 8 5 42 914 32 4 972
|
||||||
|
20140882: 610 61 3 628 3
|
||||||
|
6885: 6 8 4 26 3 4 77 2 8 8 9 5
|
||||||
|
151119936: 253 4 2 488 17 9
|
||||||
|
32732547: 6 4 6 3 2 2 5 28 249 2 2
|
||||||
|
121176900: 374 8 4 5 3 75 97 3 9
|
||||||
|
3027367: 8 9 7 3 8 5 8 8 204 1 5 7
|
||||||
|
34496056: 1 1 96 9 8 984 6 50 856
|
||||||
|
65882880: 1 2 379 30 9 8 19 344 3
|
||||||
|
5615124: 4 7 3 453 927 3 4
|
||||||
|
8526656770: 698 26 839 8 56
|
||||||
|
43959805: 5 86 75 9 760 3 42
|
||||||
|
6122221444: 612 221 20 94 42 3
|
||||||
|
3800861: 4 557 78 2 82
|
||||||
|
6497422: 21 9 5 9 84 361 80 74
|
||||||
|
452465: 9 6 3 2 5 7 11 3 4 92 7 2
|
||||||
|
3580700: 3 1 34 10 540 61 25 4
|
||||||
|
1062440442057: 8 2 5 1 42 2 475 56 1 57
|
||||||
|
390236066076700: 92 88 1 83 94 350 482
|
||||||
|
5100: 4 9 78 6 5
|
||||||
|
2726331102: 791 2 966 8 4 223
|
||||||
|
143421: 72 3 664
|
||||||
|
10399: 73 1 3 7 2
|
||||||
|
618197: 4 3 574 4 266 7 6
|
||||||
|
5708930220: 120 1 1 147 786 5 81
|
||||||
|
1071766382: 8 931 6 7 8 7 1 10 8 1 4 5
|
||||||
|
39849259: 4 6 60 1 79 1 6 6 3 350 9
|
||||||
|
1725025: 7 70 69 51 715
|
||||||
|
8642774: 815 5 487 69 7 79
|
||||||
|
3853: 9 632 6 7
|
||||||
|
64571316: 56 8 571 316
|
||||||
|
616927080: 1 576 319 924 746
|
||||||
|
1438: 6 8 22 87 48 581 414
|
||||||
|
4616555876: 794 5 879 581 177
|
||||||
|
2275229: 31 9 629 56 5
|
||||||
|
82766: 2 7 3 7 4 15 8 14 2 839 2
|
||||||
|
2544570: 2 1 9 8 6 9 97 2 88 48 6 5
|
||||||
|
57285750: 47 487 25 30 25
|
||||||
|
5885217807300: 972 9 5 500 3 90 5 598
|
||||||
|
164897: 9 4 43 27 898
|
||||||
|
33678972736: 1 5 877 3 39 49 64
|
||||||
|
2359840: 45 73 6 2 86
|
||||||
|
106395: 94 3 9 39 8
|
||||||
|
41061279: 6 5 5 4 2 5 3 8 2 4 33 569
|
||||||
|
2359224198: 3 7 4 35 3 9 7 7 9 188 4 6
|
||||||
|
113433: 1 54 8 57 88
|
||||||
|
19804474: 7 8 3 9 9 11 7 3 373 4 1 3
|
||||||
|
1740960: 8 364 5 936
|
||||||
|
6107: 7 1 9 68 9 1 9 4 6 3 950
|
||||||
|
239324643: 974 1 230 83 6 8 4 6 4 3
|
||||||
|
50780262: 7 6 1 2 1 38 2 960 4 9 8 6
|
||||||
|
5647983: 5 57 50 31 93
|
||||||
|
63144: 420 443 2 12 9 8
|
||||||
|
91212709: 46 6 80 9 51 9 8 9 54 22
|
||||||
|
55561: 3 92 544 59 274 66
|
||||||
|
20184719: 40 826 39 9 6 60 32 61
|
||||||
|
3995: 242 6 253 2 53 8 9 515
|
||||||
|
923198470: 158 317 87 5 5 194
|
||||||
|
747: 400 17 316 6 8
|
||||||
|
48659373: 407 369 3 12 9 9
|
||||||
|
1953: 4 89 3 1 7
|
||||||
|
104266695: 91 24 115 4 2 7 443 51
|
||||||
|
78870: 7 2 2 84 38 33
|
||||||
|
5629698: 6 473 85 3 642
|
||||||
|
1539748: 298 735 934 7
|
||||||
|
2092818: 7 838 85 4 113 7 26 3
|
||||||
|
244301: 2 534 64 94 92
|
||||||
|
456120: 661 23 1 6 5
|
||||||
|
15278572: 891 2 5 181 94
|
||||||
|
968968364: 529 8 629 73 364
|
||||||
|
221377755: 6 356 20 8 7 434
|
||||||
|
305430: 4 44 580 404 6
|
||||||
|
1009175131: 91 6 463 175 132
|
||||||
|
1254388516: 2 5 793 9 584 76 5 9 1 8
|
||||||
|
5086841824: 770 7 33 61 66
|
||||||
|
1488169274: 8 8 36 7 8 6 52 6 35 3 71
|
||||||
|
2200: 62 7 6 1 5
|
||||||
|
111640120704: 974 415 2 2 274 8 9 7
|
||||||
|
6098049041: 8 6 54 6 2 56 8 276 765
|
||||||
|
1126667169: 72 326 231 48 78
|
||||||
|
426: 2 208 7 3 1
|
||||||
|
6038385312: 89 1 73 4 8 88 7 8 502 3
|
||||||
|
11543: 175 375 20 4 539
|
||||||
|
16453949: 39 25 9 455 56 4 32
|
||||||
|
2070421: 641 6 8 4 21
|
||||||
|
15782: 3 8 5 1 3 4 8 9 6 88 26
|
||||||
|
2346: 3 2 9 3 7 74 6 4 8
|
||||||
|
4426435: 6 816 226 2 4 84 359
|
||||||
|
127359829066: 2 16 304 736 2 421 3 8
|
||||||
|
33924376: 5 1 4 9 148 22 6 27 7 3 6
|
||||||
|
4878607725: 48 78 607 7 25
|
||||||
|
11704911754: 29 3 2 34 8 8 7 9 1 1 751
|
||||||
|
5781418: 973 3 594 14
|
||||||
|
1599411: 6 2 5 818 2 6 7 44 36 3 3
|
||||||
|
35080351: 676 62 31 27 3 3
|
||||||
|
63052996402: 5 474 4 38 5 7 640 5
|
||||||
|
21192: 686 5 1 5 96 6
|
||||||
|
3899: 469 41 16 7 92 125
|
||||||
|
6338195: 501 2 5 3 3 7 1 7 9 5 76 4
|
||||||
|
1989: 7 427 50 4 53
|
||||||
|
3583: 17 1 2 9 153
|
||||||
|
11496418: 1 7 74 9 69 54 9 15 5 5 8
|
||||||
|
6681: 9 1 3 73 17 2 646 352 8
|
||||||
|
163587610: 2 381 5 18 1 1 7 680 1 8
|
||||||
|
56802687708: 7 2 4 668 64 250 618 6
|
||||||
|
2764745: 6 3 1 7 7 71 1 1 6 69 7 53
|
||||||
|
61589110: 61 54 4 911 2
|
||||||
|
980929619: 846 970 53 50 6 9 719
|
||||||
|
12001: 421 238 5 833 4 9 1 2 5
|
||||||
|
11984293548: 3 7 6 4 9 492 9 8 9 4 102
|
||||||
|
2576400: 6 8 1 3 1 3 6 445 8 5 114
|
||||||
|
39247: 3 543 3 8 59 92
|
||||||
|
19888723: 2 994 8 720 3
|
||||||
|
208913040: 2 818 337 126 6
|
||||||
|
3658907: 2 70 95 890 9
|
||||||
|
13899: 71 4 3 5 1 3 89 4 9 65 8 2
|
||||||
|
4812: 6 9 72 920 5
|
||||||
|
39834: 25 20 224 11 3 5
|
||||||
|
16753825: 98 73 130 739 9 18 1
|
||||||
|
5025815: 5 7 5 8 6 52 7 9 7 8 5 516
|
||||||
|
57909860: 3 551 37 1 2 62 92 961
|
||||||
|
74133: 24 8 1 6 48 10 3
|
||||||
|
187412772600: 60 52 710 81 940 5 2 9
|
||||||
|
96688: 318 16 4 286 2 18
|
||||||
|
8342: 1 20 1 55 9 97
|
||||||
|
101549671: 3 936 76 496 71
|
||||||
|
547473881: 5 3 20 9 58 92 7 38 7 8
|
||||||
|
179229334: 1 698 53 931 256 662
|
||||||
|
441290: 57 98 3 949 5
|
||||||
|
1480836: 13 8 5 8 8 839 7 62 78 6
|
||||||
|
48544: 2 1 6 24 3 645 2 7 6 8 1 1
|
||||||
|
9538811346: 7 156 8 898 85 81 86
|
||||||
|
1680092: 50 400 84 91 1
|
||||||
|
9949559436: 57 2 501 850 3 6 22 36
|
||||||
|
15344423037: 1 5 8 9 5 665 262 2 9 8 1
|
||||||
|
48581: 29 5 17 534 82 609
|
||||||
|
1547: 34 51 2 3 72 74 85 3 71
|
||||||
|
1184465530: 1 4 8 2 6 6 89 3 1 5 2 8
|
||||||
|
536939381: 7 767 39 31 2 69
|
||||||
|
3216745: 72 85 81 94 511
|
||||||
|
2058711594: 6 8 7 5 457 79 3 8 2 9 39
|
||||||
|
1992211259: 158 2 549 7 9 72 2 5 49
|
||||||
|
6408597572: 6 1 634 85 975 75
|
||||||
|
1262184680: 7 6 1 683 4 75 1 8 5 1 4 2
|
||||||
|
3396: 3 8 9 34 563 323 3 576
|
||||||
|
40048: 9 9 8 7 88 6 1 2 9 7 69 4
|
||||||
|
6295300: 78 8 14 948 6 3 69 1 9 8
|
||||||
|
2570661181437: 8 1 14 46 11 88 576 5
|
||||||
|
11230549368122: 713 99 991 43 37 24
|
||||||
|
200254: 348 82 71 7 2
|
||||||
|
14205: 1 5 3 46 7 5 8 433 7 2 4 1
|
||||||
|
602616: 3 559 60 4 8 80 844
|
||||||
|
188713547: 7 43 255 90 4 37 230
|
||||||
|
1632052: 9 4 6 2 85 42 7
|
||||||
|
152869: 495 4 7 6 2 68 804 6 7 3
|
||||||
|
10354970912: 851 130 18 56 52
|
||||||
|
1175: 929 88 5 64 89
|
||||||
|
108231077: 299 13 4 2 1 6 8 867 1 1
|
||||||
|
15777018: 878 4 95 54 81
|
||||||
|
2918529: 4 143 26 51 6
|
||||||
|
1636355: 43 885 895 9 7 8 2 8 1 3
|
||||||
|
84277: 8 4 278
|
||||||
|
14448399: 3 4 294 48 402
|
||||||
|
7361631: 652 2 42 797 628
|
||||||
|
85232018241: 5 3 270 160 879 945 2
|
||||||
|
5012416: 7 716 402 7 6
|
||||||
|
11799346: 985 99 121 5 26
|
||||||
|
89285174: 89 28 1 5 17 4 2
|
||||||
|
2131137: 4 531 7 137
|
||||||
|
196850926: 7 75 254 898 26
|
||||||
43
advent-of-code/2024/day_07/lib/evaluator.ex
Normal file
43
advent-of-code/2024/day_07/lib/evaluator.ex
Normal file
|
|
@ -0,0 +1,43 @@
|
||||||
|
defmodule Evaluator do
|
||||||
|
@doc """
|
||||||
|
Parameters:
|
||||||
|
- `equations` is a list of {test value, numbers} tuples.
|
||||||
|
- `operations` is a list of functions that may be applied to numbers.
|
||||||
|
|
||||||
|
iex> Evaluator.get_calibration_result([{4, [2, 2]}], [&Kernel.+/2])
|
||||||
|
4
|
||||||
|
"""
|
||||||
|
def get_calibration_result(equations, operations) do
|
||||||
|
equations
|
||||||
|
|> Enum.filter(fn {test_value, numbers} -> could_be_true?(test_value, numbers, operations) end)
|
||||||
|
|> Enum.map(fn {test_value, _} -> test_value end)
|
||||||
|
|> Enum.sum()
|
||||||
|
end
|
||||||
|
|
||||||
|
def could_be_true?(test_value, numbers, operations) do
|
||||||
|
res =
|
||||||
|
get_variants(numbers, operations)
|
||||||
|
|> Enum.find(fn x -> x == test_value end)
|
||||||
|
|
||||||
|
res != nil
|
||||||
|
end
|
||||||
|
|
||||||
|
# Very slow...
|
||||||
|
def get_variants([n1 | tail], operations) do
|
||||||
|
case tail do
|
||||||
|
[] ->
|
||||||
|
[n1]
|
||||||
|
|
||||||
|
[n2 | new_tail] ->
|
||||||
|
operations
|
||||||
|
|> Enum.map(fn op -> op.(n1, n2) end)
|
||||||
|
|> Enum.map(fn op_res -> get_variants([op_res | new_tail], operations) end)
|
||||||
|
|> Enum.concat()
|
||||||
|
end
|
||||||
|
end
|
||||||
|
|
||||||
|
def concat(n1, n2) do
|
||||||
|
n3 = Integer.to_string(n1) <> Integer.to_string(n2)
|
||||||
|
String.to_integer(n3)
|
||||||
|
end
|
||||||
|
end
|
||||||
29
advent-of-code/2024/day_07/lib/solve.ex
Normal file
29
advent-of-code/2024/day_07/lib/solve.ex
Normal file
|
|
@ -0,0 +1,29 @@
|
||||||
|
defmodule Mix.Tasks.Solve do
|
||||||
|
use Mix.Task
|
||||||
|
|
||||||
|
@impl Mix.Task
|
||||||
|
def run(_) do
|
||||||
|
input =
|
||||||
|
File.stream!("input.txt")
|
||||||
|
|> Stream.map(&String.trim/1)
|
||||||
|
|> Stream.map(fn str -> String.split(str, ": ") end)
|
||||||
|
|> Stream.map(fn [test_value | numbers] ->
|
||||||
|
{String.to_integer(test_value), parse_numbers(hd(numbers))}
|
||||||
|
end)
|
||||||
|
|> Enum.to_list()
|
||||||
|
|
||||||
|
res1 = Evaluator.get_calibration_result(input, [&Kernel.+/2, &Kernel.*/2])
|
||||||
|
IO.puts("Part 1: #{res1}")
|
||||||
|
|
||||||
|
res2 =
|
||||||
|
Evaluator.get_calibration_result(input, [&Kernel.+/2, &Kernel.*/2, &Evaluator.concat/2])
|
||||||
|
|
||||||
|
IO.puts("Part 2: #{res2}")
|
||||||
|
end
|
||||||
|
|
||||||
|
def parse_numbers(nums) do
|
||||||
|
nums
|
||||||
|
|> String.split()
|
||||||
|
|> Enum.map(&String.to_integer/1)
|
||||||
|
end
|
||||||
|
end
|
||||||
28
advent-of-code/2024/day_07/mix.exs
Normal file
28
advent-of-code/2024/day_07/mix.exs
Normal file
|
|
@ -0,0 +1,28 @@
|
||||||
|
defmodule Day07.MixProject do
|
||||||
|
use Mix.Project
|
||||||
|
|
||||||
|
def project do
|
||||||
|
[
|
||||||
|
app: :day_07,
|
||||||
|
version: "0.1.0",
|
||||||
|
elixir: "~> 1.16",
|
||||||
|
start_permanent: Mix.env() == :prod,
|
||||||
|
deps: deps()
|
||||||
|
]
|
||||||
|
end
|
||||||
|
|
||||||
|
# Run "mix help compile.app" to learn about applications.
|
||||||
|
def application do
|
||||||
|
[
|
||||||
|
extra_applications: [:logger]
|
||||||
|
]
|
||||||
|
end
|
||||||
|
|
||||||
|
# Run "mix help deps" to learn about dependencies.
|
||||||
|
defp deps do
|
||||||
|
[
|
||||||
|
# {:dep_from_hexpm, "~> 0.3.0"},
|
||||||
|
# {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
|
||||||
|
]
|
||||||
|
end
|
||||||
|
end
|
||||||
4
advent-of-code/2024/day_07/test/evaluator_test.exs
Normal file
4
advent-of-code/2024/day_07/test/evaluator_test.exs
Normal file
|
|
@ -0,0 +1,4 @@
|
||||||
|
defmodule EvaluatorTest do
|
||||||
|
use ExUnit.Case
|
||||||
|
doctest Evaluator
|
||||||
|
end
|
||||||
1
advent-of-code/2024/day_07/test/test_helper.exs
Normal file
1
advent-of-code/2024/day_07/test/test_helper.exs
Normal file
|
|
@ -0,0 +1 @@
|
||||||
|
ExUnit.start()
|
||||||
Loading…
Reference in a new issue