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authorNat Lasseter <user@4574.co.uk>2019-12-19 17:48:09 +0000
committerNat Lasseter <user@4574.co.uk>2019-12-19 17:48:09 +0000
commitcb2cfa0ac23d7daf7f7eb601783adc5f30a35d67 (patch)
tree036cfd53304efce97aaba3a2ba17f76d21c56020 /day19/part1
parentd3107bc313c1cf52e7df9eb9d8ec1fe402416e3c (diff)
Day19 part1, runs forever. looks like an 'understanding the input' type problem.HEADmaster
Diffstat (limited to 'day19/part1')
-rwxr-xr-xday19/part1125
1 files changed, 125 insertions, 0 deletions
diff --git a/day19/part1 b/day19/part1
new file mode 100755
index 0000000..31220e5
--- /dev/null
+++ b/day19/part1
@@ -0,0 +1,125 @@
+#!/usr/bin/env ruby
+
+class Machine
+ def initialize(starting_memory = [])
+ @mem = starting_memory
+ @pc = 0
+ @halt = false
+ @buffered_input = []
+ @buffered_output = []
+ @relative_base = 0
+ end
+
+ def mem(start = 0, len = @mem.length)
+ @mem[start...(start + len)]
+ end
+
+ def halt!
+ @halt = true
+ end
+
+ def halt?
+ @halt
+ end
+
+ def buffer_input(x)
+ if x.is_a?(Array) then
+ @buffered_input += x
+ else
+ @buffered_input.push(x)
+ end
+ end
+
+ def buffered_output(flush = false)
+ t = @buffered_output
+ @buffered_output = [] if flush
+ t
+ end
+
+ def step
+ return if halt?
+
+ opcode = @mem[@pc] % 100
+
+ if opcode == 99 then
+ halt!
+ @pc += 1
+ return
+ end
+
+ p3, p2, p1 = ("%03d" % (@mem[@pc] / 100)).chars
+
+ l1w, l1r = get(p1, 1)
+ l2w, l2r = get(p2, 2) if [1,2,5,6,7,8].include?(opcode)
+ l3w, l3r = get(p3, 3) if [1,2,7,8].include?(opcode)
+
+ case opcode
+ when 1
+ @mem[l3w] = l1r + l2r
+ @pc += 4
+ when 2
+ @mem[l3w] = l1r * l2r
+ @pc += 4
+ when 3
+ @mem[l1w] = @buffered_input.shift
+ @pc += 2
+ when 4
+ @buffered_output.push(l1r)
+ @pc += 2
+ when 5
+ @pc = (l1r != 0 ? l2r : @pc + 3)
+ when 6
+ @pc = (l1r == 0 ? l2r : @pc + 3)
+ when 7
+ @mem[l3w] = (l1r < l2r ? 1 : 0)
+ @pc += 4
+ when 8
+ @mem[l3w] = (l1r == l2r ? 1 : 0)
+ @pc += 4
+ when 9
+ @relative_base += l1r
+ @pc += 2
+ end
+ end
+
+ def run
+ until halt? do
+ step
+ end
+ end
+
+ private
+
+ def get(p, a)
+ w = case p
+ when "0"
+ @mem[@pc + a]
+ when "2"
+ @relative_base + @mem[@pc + a]
+ end
+ r = case p
+ when "0"
+ @mem[@mem[@pc + a]]
+ when "1"
+ @mem[@pc + a]
+ when "2"
+ @mem[@relative_base + @mem[@pc + a]]
+ end
+ [w, r || 0]
+ end
+end
+
+input = $stdin.readlines[0].strip.split(",").map(&:to_i)
+
+count = 0
+50.times do |x|
+ 50.times do |y|
+ m = Machine.new(input)
+ m.buffer_input(x)
+ m.buffer_input(y)
+ m.run
+ count += m.buffered_output.last
+ end
+end
+
+puts count