advent-of-code/2022/python/day08.py

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Python
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from pprint import pprint as pp
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import shared
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import matrix
def part1(mx):
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SIZE = len(mx)
MAX_IDX = SIZE - 1
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data = matrix.matrix_of_size(SIZE, SIZE)
data = matrix.set_matrix_dict(data)
for row in range(SIZE):
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for col in range(SIZE):
data[row][col] = {"l": True, "r": True, "u": True, "d": True}
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for row, _row in enumerate(mx):
# Skip outer edges
if row == 0 or row == MAX_IDX:
continue
for col, _val in enumerate(mx[row]):
# Skip outer edges
if col == 0 or col == MAX_IDX:
continue
# TODO: slice
# Get a list of indexes in the current direction to check
trees_u_indexes = list(range(0, row))
trees_l_indexes = list(range(0, col))
trees_d_indexes = list(range(MAX_IDX, row, -1))
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trees_r_indexes = list(range(col + 1, SIZE))
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# Get the trees in the line
trees_u = [mx[y][col] for y in trees_u_indexes]
trees_l = [mx[row][x] for x in trees_l_indexes]
trees_d = [mx[y][col] for y in trees_d_indexes]
trees_r = [mx[row][x] for x in trees_r_indexes]
# find tallest tree in line
highest_u = max(trees_u)
highest_l = max(trees_l)
highest_d = max(trees_d)
highest_r = max(trees_r)
# if there's anything as tall, or taller than this tree in that line
# then it's not visible
if highest_u >= _val:
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data[row][col]["u"] = False
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if highest_l >= _val:
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data[row][col]["l"] = False
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if highest_d >= _val:
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data[row][col]["d"] = False
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if highest_r >= _val:
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data[row][col]["r"] = False
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# count visible
count = 0
for row in range(SIZE):
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for col in range(SIZE):
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u = data[row][col]["u"]
l = data[row][col]["l"]
d = data[row][col]["d"]
r = data[row][col]["r"]
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if any((r, l, u, d)):
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count += 1
print(count)
def part2(mx):
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SIZE = len(mx)
MAX_IDX = SIZE - 1
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data = matrix.matrix_of_size(SIZE, SIZE)
data = matrix.set_matrix_dict(data)
high_score = 0
for row in range(SIZE):
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for col in range(SIZE):
data[row][col] = {"value": mx[row][col]}
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for row, _row in enumerate(mx):
for col, _val in enumerate(mx[row]):
# Get a list of indexes in the current direction to check
# TODO: slice
trees_u_indexes = list(range(0, row))
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trees_l_indexes = list(range(0, col))
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trees_d_indexes = list(range(MAX_IDX, row, -1))
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trees_r_indexes = list(range(col + 1, SIZE))
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# Grab the trees potentially in sight
trees_u = [mx[y][col] for y in trees_u_indexes]
trees_l = [mx[row][x] for x in trees_l_indexes]
trees_d = [mx[y][col] for y in trees_d_indexes]
trees_r = [mx[row][x] for x in trees_r_indexes]
# Reverse everything but r, as everything is "away" from the tree
data[row][col]["u"] = list(reversed(trees_u))
data[row][col]["l"] = list(reversed(trees_l))
data[row][col]["d"] = list(reversed(trees_d))
data[row][col]["r"] = trees_r
# Calculate score
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score = 1 # identity yoooo
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cell = data[row][col]
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val = cell["value"]
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# Get the score of visible trees in each direction
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for direction in ("u", "l", "d", "r"):
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in_line = cell[direction]
if not in_line:
# we're on an edge
score = 0
break
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line_score = 0
for idx, tree in enumerate(in_line):
# for every tree, check if its as tall or taller,
# stop countig after that
line_score += 1
if tree >= val:
break
score = score * line_score
if score > high_score:
high_score = score
print(high_score)
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def part2_with_fixes(mx):
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SIZE = len(mx)
MAX_IDX = SIZE - 1
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data = matrix.matrix_of_size(SIZE, SIZE)
data = matrix.set_matrix_dict(data)
high_score = 0
for row in range(SIZE):
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for col in range(SIZE):
data[row][col] = {"value": mx[row][col]}
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for row, _row in enumerate(mx):
for col, _val in enumerate(mx[row]):
lineofsight = matrix.line_of_sight(mx, row, col)
data[row][col]["u"] = lineofsight["U"]
data[row][col]["l"] = lineofsight["L"]
data[row][col]["d"] = lineofsight["D"]
data[row][col]["r"] = lineofsight["R"]
# Calculate score
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score = 1 # identity yoooo
val = data[row][col]["value"]
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# Get the score of visible trees in each direction
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for direction in ("u", "l", "d", "r"):
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in_line = data[row][col][direction]
if not in_line:
# we're on an edge
score = 0
break
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line_score = 0
for idx, tree in enumerate(in_line):
# for every tree, check if its as tall or taller,
# stop countig after that
line_score += 1
if tree >= val:
break
score = score * line_score
if score > high_score:
high_score = score
print(high_score)
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def main():
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mx = matrix.load_matrix_file(shared.get_fname(8))
with shared.elapsed_timer() as elapsed:
part1(mx)
print(elapsed())
with shared.elapsed_timer() as elapsed:
part2(mx)
print(elapsed())
with shared.elapsed_timer() as elapsed:
part2_with_fixes(mx)
print(elapsed())
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if __name__ == "__main__":
main()