Solution Day 1 - part 1 & 2

Author: Kaba8081

solutions/2025/1/main.py

@@ -0,0 +1,88 @@
+# 'Advent of code' solution for year {year} day {day}
+import os
+import sys
+
+DIR_PATH = os.path.dirname(os.path.realpath(__file__))
+
+def _get_input():
+    content = None
+    if os.path.isfile(os.path.join(DIR_PATH, "input.txt")):
+        with open(os.path.join(DIR_PATH, "input.txt"), "r", encoding="utf-8") as file:
+            content = file.read().strip().splitlines()
+        return content
+    else:
+        print("Error! Input file does not exist!")
+        sys.exit()
+
+def rotate_dial(dial: list[int], amount: int) -> int:
+    start = dial[50]
+    count = 0
+    full_rotations = abs(amount) // len(dial)
+    rest = abs(amount) % len(dial)
+
+    passed_zero_in_partial = False
+    if amount > 0: # Rotate Left
+        index = amount % len(dial)
+
+        for step in range(1, rest + 1):
+            pos = (start + step) % len(dial)
+            if pos == 0:
+                passed_zero_in_partial = True
+    else: # Rotate right
+        index = len(dial) - ((-amount) % len(dial))
+
+        for step in range(1, rest + 1):
+            pos = (start - step) % len(dial)
+            if pos == 0:
+                passed_zero_in_partial = True
+
+    dial[:] = dial[index:] + dial[:index]
+
+    count += full_rotations
+    if passed_zero_in_partial:
+        count += 1
+    elif dial[50] == 0:
+        count += 1
+    return count
+
+def part_1(i: list[str]):
+    dial = [i for i in range(100)]
+
+    count = 0
+    for instruction in i:
+        direction, amount = instruction[0], int(instruction[1:])
+
+        if direction == "R":
+            amount = -amount
+
+        rotate_dial(dial, amount)
+
+        if dial[50] == 0:
+            count += 1
+
+    print(f"[P1]: The password is: {count}")
+
+def part_2(i: list[str]):
+    dial = [i for i in range(100)]
+
+    count = 0
+    for instruction in i:
+        direction, amount = instruction[0], int(instruction[1:])
+
+        if direction == "R":
+            amount = -amount
+
+        count += rotate_dial(dial, amount)
+
+    print(f"[P2]: The password is: {count}")
+
+if __name__ == "__main__":
+    inputs = _get_input()
+    if not inputs:
+        print("Error! Input file is empty!")
+        sys.exit()
+
+    part_1(inputs)
+    part_2(inputs)
+
+    sys.exit()