Day 7

7.jl

@@ -0,0 +1,24 @@
+const equations::Vector{Vector{Int}} = [ map(x -> parse(Int, x), split(line, Regex("[:\\s]+"))) for line in readlines("input/7") ]
+
+partOne, partTwo = 0, 0
+
+concat(a::Number, b::Number) = a * 10^ndigits(b) + b
+
+for (target,nums) in Iterators.peel.(equations)
+	nums = collect(nums)
+	function testCase(funcs::Tuple, p = 1, sum = 0)::Bool
+		if p > length(nums)
+			return (sum == target) 
+		end
+		return any(testCase(funcs, p+1, fn(sum, nums[p])) for fn in funcs)
+	end
+	if testCase((+, *))
+		global partOne += target
+	end
+	if testCase((+, *, concat))
+		global partTwo += target
+	end
+end
+
+@show partOne, partTwo
+