From af26a347398d8687211175c25bffac5d313482a0 Mon Sep 17 00:00:00 2001
From: wieerwill <robert.jeutter@gmx.de>
Date: Thu, 14 Dec 2023 17:25:15 +0100
Subject: [PATCH] start Day14 with Python

---
 Day14/python/solution2.py | 135 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 Day14/python/solution2.py

diff --git a/Day14/python/solution2.py b/Day14/python/solution2.py
new file mode 100644
index 0000000..52ec29f
--- /dev/null
+++ b/Day14/python/solution2.py
@@ -0,0 +1,135 @@
+def read_grid(file_path):
+    """Reads the grid from a file and returns it as a 2D list."""
+    try:
+        with open(file_path, 'r') as file:
+            grid = [list(line.strip()) for line in file]
+        return grid
+    except Exception as e:
+        print(f"Error reading file {file_path}: {e}")
+        raise
+
+def tilt_grid(grid, direction):
+    """Tilts the grid in the specified direction and moves the rounded rocks."""
+    rows, cols = len(grid), len(grid[0])
+
+    # North: Move rocks upwards
+    if direction == "north":
+        for col in range(cols):
+            for row in range(1, rows):
+                if grid[row][col] == 'O':
+                    target_row = row
+                    while target_row > 0 and grid[target_row-1][col] == '.':
+                        target_row -= 1
+                    if target_row != row:
+                        grid[target_row][col], grid[row][col] = grid[row][col], grid[target_row][col]
+    
+    # West: Move rocks to the left
+    elif direction == "west":
+        for row in range(rows):
+            for col in range(1, cols):
+                if grid[row][col] == 'O':
+                    target_col = col
+                    while target_col > 0 and grid[row][target_col-1] == '.':
+                        target_col -= 1
+                    if target_col != col:
+                        grid[row][target_col], grid[row][col] = grid[row][col], grid[row][target_col]
+
+    # South: Move rocks downwards
+    elif direction == "south":
+        for col in range(cols):
+            for row in range(rows - 2, -1, -1):  # Start from the second last row
+                if grid[row][col] == 'O':
+                    target_row = row
+                    while target_row < rows - 1 and grid[target_row + 1][col] == '.':
+                        target_row += 1
+                    if target_row != row:
+                        grid[target_row][col], grid[row][col] = grid[row][col], grid[target_row][col]
+
+    # East: Move rocks to the right
+    elif direction == "east":
+        for row in range(rows):
+            for col in range(cols - 2, -1, -1):  # Start from the second last column
+                if grid[row][col] == 'O':
+                    target_col = col
+                    while target_col < cols - 1 and grid[row][target_col + 1] == '.':
+                        target_col += 1
+                    if target_col != col:
+                        grid[row][target_col], grid[row][col] = grid[row][col], grid[row][target_col]
+
+
+def run_spin_cycles(grid, cycles):
+    """Runs the specified number of spin cycles on the grid."""
+    for _ in range(cycles):
+        for direction in ["north", "west", "south", "east"]:
+            tilt_grid(grid, direction)
+            # Implement pattern detection or optimization here if needed
+
+def run_simulation_with_cycles(file_path, cycles):
+    """Runs the simulation with spin cycles and returns the total load."""
+    try:
+        grid = read_grid(file_path)
+        run_spin_cycles(grid, cycles)
+        total_load = calculate_load(grid)
+        return total_load
+    except Exception as e:
+        print(f"Error during simulation for file {file_path}: {e}")
+        raise
+
+def grid_to_string(grid):
+    """Converts the grid to a string for easy comparison."""
+    return '\n'.join(''.join(row) for row in grid)
+
+def run_spin_cycles_with_optimization(grid, max_cycles):
+    """Runs spin cycles on the grid with optimizations for large cycle numbers."""
+    seen_states = set()
+    for cycle in range(max_cycles):
+        previous_state = grid_to_string(grid)
+
+        if previous_state in seen_states:
+            print(f"Repeating state detected at cycle {cycle}. Exiting early.")
+            break
+
+        seen_states.add(previous_state)
+
+        for direction in ["north", "west", "south", "east"]:
+            tilt_grid(grid, direction)
+
+    return cycle  # Return the number of cycles actually run
+
+
+def test_simulation_with_cycles():
+    """Tests the simulation with spin cycles."""
+    test_file = "../test.txt"
+    expected_load_after_cycles = 64  # Expected load after cycles in the test case
+
+    print("Running test simulation with cycles...")
+    actual_load = run_simulation_with_cycles(test_file, 1000000000)
+    print(f"Test simulation load after cycles: {actual_load}")
+
+    assert actual_load == expected_load_after_cycles, f"Test failed: expected {expected_load_after_cycles}, got {actual_load}"
+    print("Test passed successfully.")
+
+def main():
+    """Main function to run the test and then the actual simulation with cycles."""
+    try:
+        test_simulation_with_cycles()
+
+        input_file = "../input.txt"
+        cycles = 1000000000
+        print("\nRunning actual simulation with cycles...")
+        grid = read_grid(input_file)
+        actual_cycles = run_spin_cycles_with_optimization(grid, cycles)
+        total_load = calculate_load(grid)
+        #total_load = run_simulation_with_cycles(input_file, cycles)
+        print(f"Total load from actual simulation with cycles: {total_load}")
+    except Exception as e:
+        print(f"Error in main function: {e}")
+
+# Run the main function
+if __name__ == "__main__":
+    main()
+
+# Note: The actual implementation of tilt logic for 'west', 'south', and 'east' directions
+# and any optimization techniques for handling a large number of cycles are not included here
+# due to complexity and are left as an exercise. This code provides a framework for how
+# the algorithm could be structured.