def part_2():
instructions = get_strings_by_lines('8.txt')
for idx in range(len(instructions)):
# Copy the instructions
copy = [] + instructions
log(f'trying flipping instruction {idx}')
if instructions[idx][:3] == 'jmp':
copy[idx] = 'nop' + instructions[idx][3:]
elif instructions[idx][:3] == 'nop':
copy[idx] = 'jmp' + instructions[idx][3:]
else:
log('skipping instr: ' + instructions[idx])
acc, pointer = 0, 0
already_run = set()
while pointer not in already_run:
instr = copy[pointer]
already_run.add(pointer)
acc, pointer = run_instr(instr, acc, pointer)
if pointer == len(instructions):
log(f'found it flipping idx {idx}')
return acc
log('Failed idx {idx}')
return None
def parse_tree():
rules = get_strings_by_lines('7.txt')
for rule in rules:
specifier, contain_string = rule.split(' bags contain ')
# Add this object to the tree if we don't know anything about it
if specifier not in tree:
curr_bag = Bag(specifier)
tree[specifier] = curr_bag
else:
curr_bag = tree[specifier]
for spec in contain_string.strip('.').split(', '):
spec = spec.strip('s')
if spec == 'no other bag':
continue
else:
number, bag = parse('{:d} {} bag', spec)
if bag in tree:
target_bag = tree[bag]
else:
target_bag = Bag(bag)
tree[bag] = target_bag
curr_bag.children[bag] = number
curr_bag.contains.add(bag)
target_bag.parents.add(curr_bag.name)
def part_2():
earliest, bus_list = get_strings_by_lines('13.txt')
busses = [ bus for bus in bus_list.split(',') if bus ]
# Fulfill the constraints one at a time - Once you find a number satisfying
# Two divisors, future values must be a multiple of that value.
# AKA for divisors w,x,y,z the minimum value satisfying y must be
# <the minimum value satisfying w,x> + (w * x)
# And then the minimum value satisfying z must be
# <the minimum value satisfying w,x,y> + (w * x * y)
# ETC.
current_time = 0
inc = 1
for idx in range(len(busses)):
if busses[idx] == 'x':
log(f'Skipping idx {idx}')
continue
curr_bus = int(busses[idx])
while (current_time + idx) % curr_bus != 0:
current_time += inc
log(f'constraint fulfilled! {curr_bus}')
inc *= curr_bus
log(f'New Inc: {inc}')
return current_time
def part_1():
x, y, dir = 0, 0, 'E'
log(f"({x}, {y}, {dir})")
for instr_str in get_strings_by_lines('12.txt'):
x, y, dir = handle_instruction(x, y, dir, instr_str)
log(f"({x}, {y}, {dir})")
return abs(x) + abs(y)
def part_2():
x, y, wx, wy = 0, 0, 10, 1
log(f"({x}, {y}), ({wx}, {wy})")
for instr_str in get_strings_by_lines('12.txt'):
x, y, wx, wy = handle_instruction_with_waypoint(
x, y, wx, wy, instr_str)
log(f"({x}, {y}), ({wx}, {wy})")
return abs(x) + abs(y)
def part_1():
instructions = get_strings_by_lines('8.txt')
acc, pointer = 0, 0
already_run = set()
while pointer not in already_run:
instr = instructions[pointer]
already_run.add(pointer)
acc, pointer = run_instr(instr, acc, pointer)
return acc
def part_1():
earliest, bus_list = get_strings_by_lines('13.txt')
current_time = int(earliest)
busses = [ int(bus) for bus in bus_list.split(',') if bus and bus != 'x']
while True:
log(f'Testing: {current_time}')
for bus in busses:
if current_time % bus == 0:
log('FOUND IT')
return (current_time - int(earliest)) * bus
current_time += 1
def part_1():
boarding_passes = get_strings_by_lines('5.txt')
max = 0
for bp in boarding_passes:
row = bin_search(127, bp[:7])
col = bin_search(8, bp[7:])
id = (row * 8) + col
if id > max:
max = id
return max
def part_2():
grid = [[char for char in line] for line in get_strings_by_lines('11.txt')]
changed = True
iterations = 0
print_grid(grid)
while changed:
grid, changed = iterate(grid, False)
iterations += 1
log(f"iterated {iterations} times")
print_grid(grid)
return count_grid(grid)
def part_2():
instructions = get_strings_by_lines('14.txt')
memory = {}
mask = ''
for inst in instructions:
if inst[:4] == 'mask':
(mask, ) = parse('mask = {}', inst)
log(f"set mask to {mask}")
else:
address, value = parse('mem[{:d}] = {:d}', inst)
memory = write_value_to_decoded_registers(memory, address, mask, value)
log(memory)
return sum(memory.values())
def part_1():
instructions = get_strings_by_lines('14.txt')
memory = {}
and_mask, or_mask = 0, 0
for inst in instructions:
if inst[:4] == 'mask':
(new_mask, ) = parse('mask = {}', inst)
and_mask, or_mask = set_bitmask(new_mask)
else:
address, value = parse('mem[{:d}] = {:d}', inst)
memory = set_register(memory, address, value, and_mask, or_mask)
log(memory)
return sum(memory.values())
def part_2():
rows = get_strings_by_lines('3.txt')
x = 0
tree_counts = [
count_trees(rows, slope)
for slope in [(1, 1), (3, 1), (5, 1), (7, 1), (1, 2)]
]
log(tree_counts)
# return functools.reduce(lambda x, y: x*y, tree_counts)
# Yeah, Robin, I know how to reduce stuff too
product = 1
for count in tree_counts:
product *= count
return product
def part_1():
input_arr = get_strings_by_lines('2.txt')
valid_count = 0
# Loop through every pair in the array
for input in input_arr:
min, max, char, password = parse('{:d}-{:d} {:l}: {:w}', input)
count = password.count(char)
log(f"Testing {password} for {min} to {max} {char}'s")
if min <= count <= max:
log(f"\tYES")
valid_count += 1
else:
log(f"\tNO")
return valid_count
def part_2():
boarding_passes = get_strings_by_lines('5.txt')
ids = []
for bp in boarding_passes:
row = bin_search(127, bp[:7])
col = bin_search(8, bp[7:])
ids += [(row * 8) + col]
ids.sort()
log(ids)
for idx in range(1, len(ids)):
# Did we skip a number?
if ids[idx] - ids[idx - 1] != 1:
return ids[idx] - 1 # Return the skipped number
return None
def part_2():
input_arr = get_strings_by_lines('2.txt')
valid_count = 0
# Loop through every pair in the array
for input in input_arr:
idx_a, idx_b, char, password = parse('{:d}-{:d} {:l}: {:w}', input)
count = password.count(char)
log(f"Testing {password} for {char} at indexes {idx_a} and {idx_b}")
# convert from indexing at 0 to indexing at 1
# And cast to bools to use the exclusive or operator
if bool(password[idx_a - 1] == char) ^ bool(password[idx_b -
1] == char):
log(f"\tYES")
valid_count += 1
else:
log(f"\tNO")
return valid_count
def part_1():
rows = get_strings_by_lines('3.txt')
x = 0
tree_count = 0
return count_trees(rows, (3, 1))
lib.config.DAY_NUMBER = args.day
# Import helper functions
from lib.helpers import log, get_strings_by_lines
if __name__ == "__main__":
# import the library dynamically
lib_name = f"problems.day_{args.day}"
solver = importlib.import_module(lib_name)
# Choose day 1 or day 2
if args.test:
if args.part != 2:
log('\nTesting part 1...')
computed = solver.part_1()
all_answers = get_strings_by_lines('answers-part-1.txt')
answer = all_answers[args.day - 1]
if str(computed) == answer:
print(f"Part 1: PASSED ({computed})")
else:
print(f"Part 1: FAILED")
print(f"\tcomputed: {computed}")
print(f"\tintended: {answer}")
if args.part != 1:
log('\nTesting part 2...')
computed = solver.part_2()
all_answers = get_strings_by_lines('answers-part-2.txt')
answer = all_answers[args.day - 1]
if str(computed) == answer:
print(f"Part 2: PASSED ({computed})")
else: