[py] Port 2015_01

py/aoc/__init__.py

@@ -2,6 +2,7 @@ import sys
 import argparse
 from pathlib import Path
 
+from .y2015 import d01
 from .y2016 import d01, d02, d03, d04, d05
 from .y2017 import d01, d02, d03, d04, d05, d06, d07, d08, d09
 from .y2018 import d01, d02, d03, d04, d05, d06, d07, d08, d09, d10, d11
@@ -10,6 +11,7 @@ from .y2021 import d14
 from .y2022 import d01, d02, d03, d04, d05, d06
 
 DAYS = {
+    "2015_01": y2015.d01.solve,
     "2016_01": y2016.d01.solve,
     "2016_02": y2016.d02.solve,
     "2016_03": y2016.d03.solve,

py/aoc/y2015/d01.py

@@ -0,0 +1,29 @@
+# PART 1
+
+
+def count_floors(steps):
+    return steps.count("(") - steps.count(")")
+
+
+# PART 2
+
+
+def find_basement_char(steps):
+    pos = 0
+    step_nr = 0
+    for step in steps:
+        step_nr += 1
+        if step == "(":
+            pos += 1
+        if step == ")":
+            pos -= 1
+        if pos < 0:
+            return step_nr
+
+
+def solve(inputstr):
+    steps = inputstr.strip()
+    floor = count_floors(steps)
+    print(f"Part 1: {floor}")
+    step_nr = find_basement_char(steps)
+    print(f"Part 2: {step_nr}")