From 96178dfda01be446caf4f8c8f37d881af330c205 Mon Sep 17 00:00:00 2001
From: Lucidiot <lucidiot@protonmail.com>
Date: Mon, 7 Dec 2020 02:42:52 +0100
Subject: [PATCH] 2017 day 18

---
 2017/18/duet.py | 52 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 2017/18/duet.py

diff --git a/2017/18/duet.py b/2017/18/duet.py
new file mode 100755
index 0000000..fdf6df0
--- /dev/null
+++ b/2017/18/duet.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+import sys
+from multiprocessing import Queue
+from multiprocessing.pool import ThreadPool
+from collections import defaultdict
+
+data = [l.strip().split(" ") for l in sys.stdin.readlines()]
+
+def run(ident, rcvqueue, sndqueue):
+    reg = defaultdict(int)
+    reg['p'] = ident
+    pos, times_sent, played = 0, 0, None
+
+    def parse(word):
+        try:
+            return int(word)
+        except ValueError:
+            return reg[word]
+
+    while 0 <= pos < len(data) - 1:
+        ins = data[pos]
+        if ins[0] == 'snd':
+            played = parse(ins[1])
+            if sndqueue:
+                sndqueue.put(parse(ins[1]))
+            times_sent += 1
+            print(times_sent)
+        elif ins[0] == 'set':
+            reg[ins[1]] = parse(ins[2])
+        elif ins[0] == 'add':
+            reg[ins[1]] += parse(ins[2])
+        elif ins[0] == 'mul':
+            reg[ins[1]] *= parse(ins[2])
+        elif ins[0] == 'mod':
+            reg[ins[1]] %= parse(ins[2])
+        elif ins[0] == 'rcv':
+            if rcvqueue:
+                reg[ins[1]] = rcvqueue.get()
+            elif parse(ins[1]) > 0:
+                return played
+        elif ins[0] == 'jgz':
+            pos += parse(ins[2])
+            continue
+        pos += 1
+    return times_sent
+
+print('Part 1:', run(0, None, None))
+pool = ThreadPool(processes=2)
+q1, q2 = Queue(), Queue()
+p1, p2 = pool.apply_async(run, (0, q1, q2)), pool.apply_async(run, (0, q2, q1))
+p1.get()
+print('Part 2:', p2.get())
\ No newline at end of file