2024 day 3.

src/holt59/aoc/2024/day3.py

@@ -1,10 +1,36 @@
+import re
 import sys
+from typing import Iterator
 
-lines = sys.stdin.read().splitlines()
 
-answer_1 = ...
+def extract_multiply(line: str) -> Iterator[int]:
+    for m in re.findall(r"mul\(([0-9]{1,3}),\s*([0-9]{1,3})\)", line):
+        yield int(m[0]) * int(m[1])
 
-answer_2 = ...
+
+def remove_disabled_parts(line: str) -> str:
+    fixed_line, accumulate = "", True
+    while line:
+        if accumulate:
+            if (dont_i := line.find("don't()")) != -1:
+                fixed_line += line[:dont_i]
+                line, accumulate = line[dont_i:], False
+            else:
+                fixed_line += line
+                line = ""
+        else:
+            if (do_i := line.find("do()")) != -1:
+                line, accumulate = line[do_i:], True
+            else:
+                line = ""
+
+    return fixed_line
+
+
+line = sys.stdin.read().strip()
+
+answer_1 = sum(extract_multiply(line))
+answer_2 = sum(extract_multiply(remove_disabled_parts(line)))
 
 print(f"answer 1 is {answer_1}")
 print(f"answer 2 is {answer_2}")

src/holt59/aoc/inputs/holt59/2024/day3.txt

@@ -0,0 +1,6 @@
+*who():mul(420,173)what()*~why() select()how()-mul(448,672)mul(914,202){^{why()];<&;/mul(748,792)what(),$from()what()when()mul(399,982)<;)]]mul(347,549)@;*);mul(655,663) @select()~%,$#mul(535,284)*--@()]+~mul(2,513)why()mul(239,99)!<mul(2,988)@mul(971,404)?&from()mul(660,516)-;what();how()+!why()mul(612,994)'[mul(253,728)<-mul(208,621)>?}( #]mul(162,534)#+how()}<&what();mul(685,182)mul(146,549)mul(659,511)mul(283,734)*/don't()/mul(579,121)what()mul(790,893)where()@)-{#!who()((mul(985,741)when(),$where()>do()<~''-~-mul(961,154),]select()(select()@what()mul(840,357)] when()mul(47,948))]?what()+*;+mul(331,33)who();&~~mul(983,456)mul(660,500)who()mul(414,834)where()^({>mul(961,732)#^]how() mul(869,618)mul(265,208)!when()*]mul(803,747)>*&+what()+,['mul(490,565)> >/*%mul(238,882)%+$;%&,/mul(629,355){{'/?-who():!mul(441,172):[?;mul(628,85)%%{how()]^>why()>mul(509,935)where()/]select()mul(727,783)?^@why()from()>&mul(75,582)<~!%from(){from() mul(616,901)''why()%-from()>>mul(568,812)%(*mul(833,395)$who()& ;how(112,924)why()?mul(734,354)mul(344,367):what()mul(884,545)when(753,136):{select()[mul(981,829)~!<who()>why()mul(444,22)mul(257,636)from()why();&mul(603,941)}-when()&mul(109,476)#)from()when()+;?,mul(149,108)mul(716,634)/~>:&#?mul(919,396)@why() (who()~!mul(949,950)~~:why()&mul(949,808)mul(678,162)&mul(862,475)?++:, mul(750,321)(# why()#{@/select(282,886)mul(953,52),~from()mul(408,319)?@*:#mul(308,330)select(895,376)&>#-when()do()!@*how(890,967)when()mul(607,743),^,when()}$*&mul(737,198))#[!?mul(979,606),-@+'mul(223,381)when(){+<when()%]{*mulwhere()how()<)*?&where()//mul(875,817)when()from()%how())@#]<who()mul(799,646)where()+((how():!+!why()mul(162,552)@?select()>;{mul(623,192)-}@when()@'who()select()how()#don't()!where()@@&}&mul(853,100)]{]~mul(501,746)-? *mul(599,24)mul(141,255)mul(922,727)*select()>how()$who(){+mul(544,731)/from()how()who();@select()mul(609,809)?$(/why()from())mul(498,52)]:when()mul(60,285)@'$)why() %<']do()!from()from()who()::mul(894,43)#@:$mul(731,263)why()select()who(){mul(516,369)how()who()do()$;&$/[;;[mul(655,571)]from()*what()mul(192,59)+]?select()mul(453,68)from()mul?+mul(281,2){why()]~{!,mul(823,635)^/)where()]who() @'$mul(660,562):%where()why()why()%~how()mul(437,42)mul(590,3)~-mul(428,918)>what()why()&?when(742,360)?mul(786,567)%from()when()-mul(367,375)*}why()mul(455,204)/]<,]+mul(819,196)from()@mul><when()+(where()^}&mul(605,973)&where()&^^<%why()[)mul(227,87)where()  }mul(762,536)$%~<:>mul(212,199)what()/where(462,172)~when()select()^mul(794,611)mul(484,833)( ?mul(877,152)]what()mul(758,157(][&+how(){>)mul(408,379);}{when()mul(731,259)#?how()mul(246,943)who()@what(830,854){-+>@~:don't()mul(703,111) #^what()<>^do()>,>^+!mul(57,220)#<${#why()when(457,676)>what()mul(199,247)mul(768,629)
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src/holt59/aoc/inputs/tests/2024/day3.txt

@@ -0,0 +1 @@
+xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))