From 0fd2e425ea70484ad2fa6ab7379be954c92f3c2f Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Fri, 9 Dec 2022 07:22:05 +0100
Subject: i did NOT like that

---
 2022/09/solve.py | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 2022/09/solve.py

(limited to '2022/09/solve.py')

diff --git a/2022/09/solve.py b/2022/09/solve.py
new file mode 100644
index 0000000..a4b3c3f
--- /dev/null
+++ b/2022/09/solve.py
@@ -0,0 +1,32 @@
+data = [dat.split(" ") for dat in open("input").readlines() if dat != '']
+
+def solve(n):
+    knots = [[0,0] for i in range(n)]
+    tails = set()
+    for line in data:
+        direction = line[0]
+        amount = int(line[1])
+
+        for i in range(amount):
+            head = knots[0]
+            head[0 if direction == "U" or direction == "D" else 1] += 1 if direction == "R" or direction == "U" else -1
+
+            for knot in range(len(knots)-1):
+                head, tail = knots[knot], knots[knot + 1]
+                xd, yd = head[0]-tail[0], head[1]-tail[1]
+
+                if abs(yd) > 1:
+                    tail[1] += 1 if yd > 0 else -1
+                    if abs(xd) > 0:
+                        tail[0] += 1 if xd > 0 else -1
+                elif abs(xd) > 1:
+                    tail[0] += 1 if xd > 0 else -1
+                    if abs(yd) > 0:
+                        tail[1] += 1 if yd > 0 else -1
+
+            tails.add(tuple(tail))
+
+    return len(tails)
+
+print(f"Part 1: {solve(2)}")
+print(f"Part 2: {solve(10)}")
-- 
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