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3.py
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3.py
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# day 3
with open("./input/input_3.txt", 'r') as f:
data = f.read().splitlines()
pattern_length = len(data)
pattern_width = len(data[0])
# part 1
count = 0
position = 3
for row in data[1:]:
if row[position] == '#':
count += 1
position = (position + 3) % pattern_width
print("Part 1")
print("Number of trees encountered: {}\n".format(count))
# part 2
# list of slopes
# each slope: (right value, down value)
slopes = [(1, 1), (3, 1), (5, 1), (7, 1), (1, 2)]
count_for_each_slope = list()
answer = 1
for right, down in slopes:
count = 0
position = right
for row in range(down, pattern_length, down):
if data[row][position] == '#':
count += 1
position = (position + right) % pattern_width
count_for_each_slope.append(count)
print("Part 2")
for slope, count in zip(slopes, count_for_each_slope):
print("Slope: {} Number of trees encountered: {}".format(slope, count))
for count in count_for_each_slope:
answer *= count
print("Answer: {}".format(answer))