Advent of Code 2025 - Day 1 : Python version

advent_of_code/2025(python)/day1.py

@@ -0,0 +1,52 @@
+
+def solve_day1_part1(actions):
+    start_degree = 50
+    res = 0
+
+    for ac in actions:
+        step = (int(ac[1:])) % 100
+        match ac[0]:
+            case 'L':
+                start_degree -= step
+                if start_degree < 0:
+                    start_degree = 100 + start_degree
+            case 'R':
+                start_degree += step
+                if start_degree >= 100:
+                    start_degree = start_degree-100
+
+        res += 1 if start_degree == 0 else 0
+
+    return res
+
+
+def solve_day1_part2(actions):
+    start_degree = 50
+    res = 0
+
+    for ac in actions:
+        step = (int(ac[1:]))
+        res += step//100
+
+        step = step % 100
+        start_degree = start_degree % 100
+        if step == 0:
+            continue
+
+        initial_start = start_degree
+        match ac[0]:
+            case 'L':
+                start_degree -= step
+                if start_degree <= 0:
+                    start_degree = 100 + start_degree
+                    if initial_start != 0 and start_degree != 0:
+                        res += 1
+            case 'R':
+                start_degree += step
+                if start_degree >= 100:
+                    start_degree = start_degree-100
+                    if initial_start != 0 and start_degree != 0:
+                        res += 1
+        res += 1 if start_degree == 0 else 0
+
+    return res

advent_of_code/2025(python)/test_day1.py

@@ -0,0 +1,29 @@
+import unittest
+
+from day1 import solve_day1_part1, solve_day1_part2
+
+question_input = [
+    "L68",
+    "L30",
+    "R48",
+    "L5",
+    "R60",
+    "L55",
+    "L1",
+    "L99",
+    "R14",
+    "L82",
+]
+
+
+class TestSample(unittest.TestCase):
+
+    def test_part1(self):
+        self.assertEqual(solve_day1_part1(question_input), 3)
+
+    def test_part2(self):
+        self.assertEqual(solve_day1_part2(question_input), 6)
+
+
+if __name__ == "__main__":
+    unittest.main()

run-ci.sh

@@ -20,5 +20,4 @@ done
 # For solutions with Python
 # may need to use another list for python folders next year
 echo "==entering Python solution folder=="
-cd "2024(python)"
-python -m unittest discover
+cd "2024(python)" && python -m unittest discover && cd .. && cd "2025(python)" && python -m unittest discover