My Advent of Code solutions in Python.
kevinyap.ca/2019/12/going-fast-in-advent-of-code/
advent-of-code
python
Implement bitwise inversion on Point class
This maps `Point(x, y)` to `Point(-y, -x)`, allowing for easier
manipulation of direction mappings amongst other things. I am almost
certainly going to confuse myself and think it returns `Point(-y, x)`.
+7
-4
+4
-4
2023/day16.py
+4
-4
2023/day16.py
···
29
29
if grid[photon] == '.':
30
30
photons.append((photon + d, d))
31
31
elif grid[photon] == '/':
32
-
nd = [W, E, S, N][[N, S, E, W].index(d)]
33
-
photons.append((photon + nd, nd))
32
+
# ~d takes N <-> E and S <-> W
33
+
photons.append((photon + ~d, ~d))
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elif grid[photon] == '\\':
35
-
nd = [E, W, N, S][[N, S, E, W].index(d)]
36
-
photons.append((photon + nd, nd))
35
+
# -~d takes N <-> W and S <-> E
36
+
photons.append((photon + -~d, -~d))
37
37
elif grid[photon] == '|':
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38
if d in (N, S):
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39
photons.append((photon + d, d))