Initial commit: AoC solutions 2023-2025

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Co-Authored-By: Claude <noreply@anthropic.com>

2023/10.py

@@ -0,0 +1,80 @@
+import numpy as np
+import math
+
+
+# | is a vertical pipe connecting north and south.
+# - is a horizontal pipe connecting east and west.
+# L is a 90-degree bend connecting north and east.
+# J is a 90-degree bend connecting north and west.
+# 7 is a 90-degree bend connecting south and west.
+# F is a 90-degree bend connecting south and east.
+def main():
+    with open("10-input.txt", "r") as file:
+        arr = []
+        for line in file.readlines():
+            char_array = []
+            for char in line.strip():
+                char_array.append(char)
+            arr.append(char_array)
+        matrix = np.array(arr)
+        print(matrix.shape)
+        indices = np.nonzero(matrix == "S")
+        row_indices, col_indices = indices
+        starting_pos = (row_indices[0], col_indices[0])
+        current_position: tuple = starting_pos
+        last_position: tuple = starting_pos
+        steps = 0
+        visited = []
+        while True:
+            visited.append(current_position)
+            current = matrix[current_position]
+            next_position = find_next(current, current_position, last_position)
+            print(f"steps: {steps}: current {current} next {next_position}")
+            last_position = current_position
+            current_position = next_position
+            steps += 1
+
+            if next_position == starting_pos:
+                break
+        half = steps / 2
+        print(math.ceil(half))
+        rows, cols = zip(*visited)
+        new_matrix = matrix[rows, cols]
+        print(new_matrix.shape)
+
+
+def find_next(pipe: str, position: tuple, last_position: tuple):
+    row_index, col_index = position
+    last_row_index, last_col_index = last_position
+    # print(pipe)
+    match pipe:
+        case "|":
+            if last_row_index > row_index:
+                return (row_index - 1, col_index)
+            return (row_index + 1, col_index)
+        case "-":
+            if last_col_index > col_index:
+                return (row_index, col_index - 1)
+            return (row_index, col_index + 1)
+        case "L":
+            if last_col_index > col_index:
+                return (row_index - 1, col_index)
+            return (row_index, col_index + 1)
+        case "J":
+            if last_col_index < col_index:
+                return (row_index - 1, col_index)
+            return (row_index, col_index - 1)
+        case "7":
+            if last_col_index < col_index:
+                return (row_index + 1, col_index)
+            return (row_index, col_index - 1)
+        case "F":
+            if last_row_index > row_index:
+                return (row_index, col_index + 1)
+            return (row_index + 1, col_index)
+        case "S":
+            return (row_index + 1, col_index)
+
+
+if __name__ == "__main__":
+    main()