From 33422840a980f68939ae1fab1ee015bf726574c0 Mon Sep 17 00:00:00 2001
From: Theis <theis.gaedigk@icloud.com>
Date: Sun, 7 Dec 2025 14:10:08 +0100
Subject: [PATCH] Implement main logic for counting crossings and determining
 final position in the lock mechanism

---
 {Day 1/Part 1 => Day1/Part1}/input.txt |  0
 {Day 1/Part 1 => Day1/Part1}/main.py   |  0
 {Day 1/Part 2 => Day1/Part2}/input.txt |  2 +-
 Day1/Part2/main.py                     | 32 ++++++++++++++++++++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)
 rename {Day 1/Part 1 => Day1/Part1}/input.txt (100%)
 rename {Day 1/Part 1 => Day1/Part1}/main.py (100%)
 rename {Day 1/Part 2 => Day1/Part2}/input.txt (99%)
 create mode 100644 Day1/Part2/main.py

diff --git a/Day 1/Part 1/input.txt b/Day1/Part1/input.txt
similarity index 100%
rename from Day 1/Part 1/input.txt
rename to Day1/Part1/input.txt
diff --git a/Day 1/Part 1/main.py b/Day1/Part1/main.py
similarity index 100%
rename from Day 1/Part 1/main.py
rename to Day1/Part1/main.py
diff --git a/Day 1/Part 2/input.txt b/Day1/Part2/input.txt
similarity index 99%
rename from Day 1/Part 2/input.txt
rename to Day1/Part2/input.txt
index 4d1f08f..39fbc72 100644
--- a/Day 1/Part 2/input.txt	
+++ b/Day1/Part2/input.txt
@@ -4033,4 +4033,4 @@ R17
 L19
 R42
 R48
-R39
+R39
\ No newline at end of file
diff --git a/Day1/Part2/main.py b/Day1/Part2/main.py
new file mode 100644
index 0000000..64cc5e8
--- /dev/null
+++ b/Day1/Part2/main.py
@@ -0,0 +1,32 @@
+def count_crossings_segment(P, delta):
+    P_new = P + delta
+    if delta > 0:
+        # positive Drehung: 100 * m in (P, P_new]
+        crossings = (P_new // 100) - (P // 100)
+    elif delta < 0:
+        # negative Drehung: 100 * m in [P_new, P-1]
+        crossings = ((P - 1) // 100) - ((P_new - 1) // 100)
+    else:
+        crossings = 0
+    return crossings, P_new
+
+passes = 0
+P = 50  # „entfaltete“ Position, nicht mod 100!
+
+with open("input.txt", encoding="utf-8") as f:
+    for line in f:
+        line = line.strip()
+        if not line:
+            continue
+
+        d = line[0].upper()
+        steps = int(line[1:])
+
+        delta = steps if d == 'R' else -steps
+        c, P = count_crossings_segment(P, delta)
+        passes += c
+
+final_pos = P % 100
+
+print("Anzahl 0-PASSAGEN:", passes)
+print("Endposition auf dem Schloss:", final_pos)