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2020 AoC, Days 1-4

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Teo-CD 2020-12-04 23:10:35 +01:00
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target = 2020
input_file = "/tmp/aocinput"
def find_sum_of_two():
large_n = []
small_n = []
with open(input_file) as file:
line = file.readline()
while line and line != "\n":
halftarget_count = 0
number = int(line)
if number > target/2:
large_n.append(number)
elif number == target/2:
halftarget_count += 1
else:
small_n.append(number)
if halftarget_count == 2:
print(f"Found a sum : {target/2}*2 = {target}\nAnswer is {(target/2)**2}")
break
line = file.readline()
for big_one in large_n:
complement = target-big_one
if complement in small_n:
print(f"Found a sum : {big_one}+{complement} = {target}\nAnswer is {big_one*complement}")
return
print("No sum found that can reach {target}")
def sum_search(target_sum, inputs):
lower = []
upper = []
for num in inputs:
if num < target_sum/2:
lower.append(num)
else:
upper.append(num)
search_list = lower if len(lower) < len(upper) else upper
iter_list = upper if len(lower) < len(upper) else lower
for num in iter_list:
if target_sum - num in search_list:
return num, target_sum-num
return False
def find_sum_of_three():
data = []
subtracted_to_target = []
with open(input_file) as file:
line = file.readline()
while line and line != "\n":
data.append(int(line))
subtracted_to_target.append((target-data[-1],data[-1]))
line = file.readline()
data.sort()
for sub_target in subtracted_to_target:
result = sum_search(sub_target[0],data)
if result:
print(f"Sum found : {result[0]}+{result[1]}+{sub_target[1]} = {target}\nResult is {result[0]*result[1]*sub_target[1]}")
return
print("No sum found")

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1955
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1987
1724

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input_file = "/tmp/aocinput"
def letter_count():
valid_passwords = 0
with open(input_file) as passwords:
line = passwords.readline()
while line and line != "\n":
elements = line.split(" ")
min_req, max_req = elements[0].split("-")
password_count = elements[2].count(elements[1][0])
if int(min_req) <= password_count <= int(max_req):
valid_passwords += 1
line = passwords.readline()
print(f"There are {valid_passwords} valid passwords")
def letter_position():
valid_passwords = 0
with open(input_file) as passwords:
line = passwords.readline()
while line and line != "\n":
elements = line.split(" ")
first_pos, second_pos = elements[0].split("-")
if (elements[2][int(first_pos) - 1] == elements[1][0]) ^ (elements[2][int(second_pos) - 1] == elements[1][0]):
valid_passwords += 1
line = passwords.readline()
print(f"There are {valid_passwords} valid passwords")

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input_file = "/tmp/aocinput"
map_table = []
with open(input_file) as slope_map:
line = slope_map.readline()
while line and line != "\n":
map_table.append(line)
line = slope_map.readline()
def check_for_trees(direction=(3,1)):
x_pos = 0
y_pos = 0
width = len(map_table[0])
height = len(map_table)
tree_count = 0
while y_pos < height-1:
x_pos,y_pos = ((x_pos+direction[0])%(width-1),y_pos+direction[1])
if map_table[y_pos][x_pos] == "#":
tree_count += 1
print(f"We came close to {tree_count} trees by going {direction}.")
return tree_count
def check_multiple_directions(directions):
result = 1
for direction in directions:
result *= check_for_trees(direction)
print(f"Result is {result}.")
check_multiple_directions([(1,1),(3,1),(5,1),(7,1),(1,2)])

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import re
input_file = "/tmp/aocinput"
height_re = re.compile(r'^([0-9]+)(in|cm)$')
passport_id_re = re.compile(r'^[0-9]{9}$')
color_re = re.compile(r'^#[0-9a-f]{6}$')
def check_limits(to_test, min_valid, max_valid):
return False if (to_test < min_valid or to_test > max_valid) else True
def validate_passport(record):
for field in record:
if field[0] == "byr":
if not check_limits(int(field[1]), 1920, 2002):
return False
elif field[0] == "iyr":
if not check_limits(int(field[1]), 2010, 2020):
return False
elif field[0] == "eyr":
if not check_limits(int(field[1]), 2020, 2030):
return False
elif field[0] == "hgt":
regex_match = height_re.match(field[1])
if not regex_match:
return False
if regex_match.groups()[1] == "cm" and not check_limits(int(regex_match.groups()[0]), 150,193):
return False
elif regex_match.groups()[1] == "in" and not check_limits(int(regex_match.groups()[0]),59,76):
return False
elif field[0] == "hcl":
regex_match = color_re.match(field[1])
if not regex_match:
return False
elif field[0] == "ecl":
if field[1] not in ["amb","blu","brn","gry","grn","hzl","oth"]:
return False
elif field[0] == "pid":
regex_match = passport_id_re.match(field[1])
if not regex_match:
return False
return True
records = [[]]
valid_passports = 0
with open(input_file) as passports:
line = passports.readline()
current_index = 0
while line:
if line == "\n":
records.append([])
current_index += 1
line = passports.readline()
continue
for raw_entry in line.rstrip().split(" "):
records[current_index].append(tuple(raw_entry.split(":")))
line = passports.readline()
for record in records:
if len(record) == 8:
if validate_passport(record):
valid_passports += 1
if len(record) == 7:
is_north_pole_credential = True
for field in record:
if field[0] == "cid":
is_north_pole_credential = False
break
if is_north_pole_credential and validate_passport(record):
valid_passports += 1
print(f"There are {valid_passports} valid passports out of {len(records)}")

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# Advent of Code - trotFunky's pot O' code
This is the repository where I'll be storing my solutions for the [Advent of Code](https://adventofcode.com) event run by [Eric Wastl](http://was.tl/).
The directory structure is simple : `year/day`, each day containing the input file and at least one file containing my solution(s).
## Depencies
Only Python3 for now !