Add solution for day 3

solutions/2024/src/AdventOfCode24.jl

@@ -8,7 +8,7 @@ module AdventOfCode24
     readInput(day::Int) = AdventOfCode.readInput(day, year)
     export readInput
 
-    solvedDays = [1]
+    solvedDays = [1, 2, 3]
 
     # Include the source files:
     for day in solvedDays

solutions/2024/src/day03.jl

@@ -0,0 +1,39 @@
+module Day03
+    using ..AdventOfCode24
+
+    """
+        day03()
+
+    Solves the two puzzles of day 03. 
+    """
+
+    function day03(input::String = readInput(03))
+
+        s0 = mul(input)
+        s1 = 0
+
+        for l in split(input, "do()")
+
+            i = findfirst("don't()", l)
+            !isnothing(i) && (l = first(l, first(i)))
+
+            s1 += mul(l)
+        end
+
+        return [s0, s1]
+    end
+
+    function mul(ops::AbstractString)
+        r = r"mul\((\d+),(\d+)\)"
+        s = 0
+        for m in eachmatch(r, ops)
+            a = parse(Int, m.captures[1])
+            b = parse(Int, m.captures[2])
+            s += a*b
+        end
+
+        return s
+    end
+
+end 
+

solutions/2024/test/runtests.jl

@@ -8,3 +8,7 @@ end
     @test AdventOfCode24.Day02.day02() == [356 , 413]
 end
 
+@testset "Day 03" begin
+    @test AdventOfCode24.Day03.day03() == [162813399 , 53783319]
+end
+