Make space for two-digit days

2019/day07/part1.rb

@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+require_relative 'intcode'
+
+def inputter(queue)
+  idx = 0
+  proc do
+    input = queue[idx]
+    idx += 1
+    input
+  end
+end
+
+class Amplifier
+  def initialize(memory, phase)
+    @memory = memory
+    @phase = phase
+  end
+
+  def amplify(input)
+    next_input = inputter([@phase, input])
+    computer = Intcode::Computer.new(@memory) do
+      inp = next_input.call
+      # print 'input> '
+      # puts inp
+      inp
+    end
+    output = nil
+    computer.on_output do |out|
+      output = out
+    end
+    computer.run
+    output
+  end
+end
+
+def thrust(program, phases)
+  a = Amplifier.new(program.as_memory, phases[0]).amplify(0)
+  b = Amplifier.new(program.as_memory, phases[1]).amplify(a)
+  c = Amplifier.new(program.as_memory, phases[2]).amplify(b)
+  d = Amplifier.new(program.as_memory, phases[3]).amplify(c)
+  e = Amplifier.new(program.as_memory, phases[4]).amplify(d)
+  e
+end
+
+program = Intcode.read(File.join(__dir__, 'input'))
+
+phase_space = [0, 1, 2, 3, 4].permutation(5)
+
+max_thrust = -Float::INFINITY
+max_phases = nil
+phase_space.each do |phases|
+  t = thrust(program, phases)
+  next unless t > max_thrust
+
+  max_thrust = t
+  max_phases = phases
+end
+
+pp max_phases
+puts max_thrust