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import itertools | |
from math import prod | |
with open('input.txt', 'r') as infile: | |
data = [line.strip('\n') for line in infile] | |
#Solution in one line: | |
print ("The answer to part 1 is: " + str(len([line for line in enumerate(data) if line[1][(line[0]*3) % len(line[1])] == '#']))) | |
#More verbose solution with the same method: | |
e = enumerate(data) | |
total = 0 | |
lineLength = len(data[0]) | |
for line in e: | |
charpos = (line[0]*3) % lineLength | |
if (line[1][charpos] == '#'): total += 1 | |
print(f"The answer to part 1 is: {total}") | |
#Solution to part 2 in few lines using list comprehensions: | |
def getSlopeTrees(slope, over, down): | |
return len([line for line in enumerate(slope) if (line[0] % down == 0) and ((line[0]*over)/down).is_integer() and (line[1][int((line[0]*over)/down) % len(line[1])] == '#')]) | |
testSteps = [(1,1),(3,1),(5,1),(7,1),(1,2)] | |
print (f"The answer to part 2 is : {prod([getSlopeTrees(data, *t) for t in testSteps])}") | |
#A functions that was useful in troubleshooting some list indexing issues: | |
''' | |
def getSlopeTreesVerbose(slope, over, down): | |
total = 0 | |
for line in enumerate(slope): | |
print(line, end = "\t") | |
readThisLine = (line[0] % down == 0) | |
print(f"Line[0] mod Down is 0: {readThisLine}", end = "\t") | |
treePosition = ((line[0]*over)/down) % len(line[1]) | |
print(f"Looking at position: {treePosition}", end = "\t") | |
if treePosition.is_integer(): | |
treePosition = int(treePosition) | |
lineHasTree = (line[1][treePosition] == '#') | |
print(f"Is tree? {lineHasTree}") | |
if readThisLine and lineHasTree: total = total + 1 | |
else: | |
print("") | |
return total | |
''' | |
#Print the intermediate results of testing our various setups: | |
''' | |
for t in testSteps: | |
print (f"For test Right {t[0]}, down {t[1]}, we hit {getSlopeTrees(data, *t)} trees") | |
''' |
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