From 4c5cec32f42ba06b69ceed34f9b07d9ff530a657 Mon Sep 17 00:00:00 2001
From: Ben Charlton <ben@spod.cx>
Date: Mon, 7 Dec 2020 23:05:35 +0000
Subject: [PATCH] oh dear, what a bodge, day 7

---
 07/07.py | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 07/07.py

diff --git a/07/07.py b/07/07.py
new file mode 100644
index 0000000..193af43
--- /dev/null
+++ b/07/07.py
@@ -0,0 +1,73 @@
+#!/usr/bin/python3
+
+import sys
+import re
+
+def find_bags(bags, target):
+    seen = []
+    queue = []
+    ret = {}
+    queue.append(target)
+    seen.append(target)
+
+    while len(queue) > 0:
+        current = queue.pop()
+        if current in bags:
+            items = bags[current]
+            for item in items:
+                if item not in seen:
+                    count = int(items[item])
+                    ret[item] = count
+                    queue.append(item)
+        seen.append(current)
+    return ret
+
+
+def find_bags2(bags, target):
+    count = 1
+
+    if target not in bags:
+        return 1
+
+    for item in bags[target]:
+        v = find_bags2(bags, item)
+        count = count + (v * int(bags[target][item]))
+
+    return count
+
+
+bags = {}
+bags2 = {}
+for line in sys.stdin:
+    line = line.replace(' bags','')
+    line = line.replace(' bag','')
+    line = line.replace('.','')
+    cont = line.rstrip().split(' contain ')
+    outer = cont[0]
+    inner = cont[1].split(', ')
+    for bag in inner:
+        m = re.match(r'^(\d+) (.*)$', bag)
+        count = 0
+        if m is not None:
+            bag = m.group(2)
+            count = m.group(1)
+        if bag in bags:
+            bags[bag][outer] = count
+        else:
+            t = {}
+            t[outer] = count
+            bags[bag] = t
+
+        if bag == "no other":
+            continue
+        if outer in bags2:
+            bags2[outer][bag] = count
+        else:
+            t = {}
+            t[bag] = count
+            bags2[outer] = t
+
+valid1 = find_bags(bags, 'shiny gold')
+print(1, len(valid1))
+
+print(2, find_bags2(bags2, 'shiny gold')-1)