From d85b305f8726eb731ec4821c268e6da275fde548 Mon Sep 17 00:00:00 2001
From: Sijmen Schoon <me@sijmenschoon.nl>
Date: Tue, 11 Dec 2018 15:07:24 +0100
Subject: [PATCH] Add day 11

---
 Day11/Day11.py | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Day11/Day11.py

diff --git a/Day11/Day11.py b/Day11/Day11.py
new file mode 100644
index 0000000..fdb0134
--- /dev/null
+++ b/Day11/Day11.py
@@ -0,0 +1,50 @@
+from sys import argv
+from scipy.ndimage import uniform_filter
+from scipy.signal import fftconvolve
+import numpy
+
+try:
+    SERIAL = int(argv[1])
+except (ValueError, IndexError):
+    print(f"Usage: {argv[0]} [serial]")
+
+# Build the grid.
+grid = numpy.zeros((300, 300), dtype=numpy.int32)
+for y, row in enumerate(grid):
+    rack_id = numpy.arange(1, 301, dtype=numpy.int32) + 10
+    power_level = (rack_id * (y + 1) + SERIAL) * rack_id
+    power_level = power_level // 100 % 10 - 5
+    grid[y] = power_level
+
+def main(from_, to=None):
+    max_y, max_x = None, None
+    max_size = 0
+    max_value = 0
+
+    if to is None:
+        to = from_ + 1
+
+    for size in range(from_, to):
+        # Calculate the totals by convolving with a filter with ones.
+        filter_ = numpy.ones((size, size), dtype=int)
+        totals = fftconvolve(grid, filter_, "valid")
+
+        # Find the indices of the maximum value.
+        y, x = numpy.unravel_index(totals.argmax(), totals.shape)
+        value = totals[y, x]
+
+        if value > max_value:
+            max_size, max_y, max_x = size, y, x
+            max_value = value
+
+    if to == from_ + 1:
+        # If the range is one, it was part 1.
+        print(f"{max_x + 1},{max_y + 1}")
+    else:
+        print(f"{max_x + 1},{max_y + 1},{max_size}")
+
+
+print("part 1:")
+main(3)
+print("part 2:")
+main(1, 100)