From 32e3e95370bda3c3163adcde9016a72a390eec54 Mon Sep 17 00:00:00 2001
From: Sebastian Seedorf <mail@sebse.de>
Date: Thu, 3 Dec 2020 11:47:50 +0100
Subject: [PATCH] Day 3 (part 2 array slicing)

---
 day03/part2.py      | 16 +++++++---------
 python-aoc-2020.iml |  3 +++
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/day03/part2.py b/day03/part2.py
index e11f0a8..2974997 100644
--- a/day03/part2.py
+++ b/day03/part2.py
@@ -3,7 +3,7 @@ from functools import reduce
 
 lines = [x.strip() for x in open("input.txt")]
 
-pos = 0.0
+pos = 0
 count = 0
 factors = []
 
@@ -12,15 +12,13 @@ def prod(iterable):
     return reduce(operator.mul, iterable, 1)
 
 
-for movement in [1, 3, 5, 7, 0.5]:
+for x, y in [(1, 1), (3, 1), (5, 1), (7, 1), (1, 2)]:
     count = 0
-    for line in lines:
-        if isinstance(pos, int) or pos.is_integer():
-            pos = int(pos)
-            pos = pos % len(line)
-            if line[pos] == '#':
-                count += 1
-        pos += movement
+    for line in lines[::y]:
+        pos = pos % len(line)
+        if line[pos] == '#':
+            count += 1
+        pos += x
     factors.append(count)
     pos = 0
 
diff --git a/python-aoc-2020.iml b/python-aoc-2020.iml
index 1e36f4d..f5ec54c 100644
--- a/python-aoc-2020.iml
+++ b/python-aoc-2020.iml
@@ -13,4 +13,7 @@
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="Python 3.6 interpreter library" level="application" />
   </component>
+  <component name="PyDocumentationSettings">
+    <option name="renderExternalDocumentation" value="true" />
+  </component>
 </module>
\ No newline at end of file