Python

(Part 1) omg I can’t believe this actually worked first try!

with open('input') as data:
    parts = data.read().rstrip().split("\n\n")
    ordering_rules = parts[0].split("\n")
    updates = parts[1].split("\n")

correct_updates = []
middle_updates = []

def find_relevant_rules(pg_num: str, rules: list[str]) -> list[str] | None:
    for rule in rules:
        return list(filter(lambda x: x.split("|")[0] == pg_num, rules))

def interpret_rule(rule: str) -> list[str]:
    return rule.split("|")

def interpret_update(update: str) -> list[str]:
    return update.split(",")

def find_middle_update_index(update: list[str]) -> int:
    num_of_elements = len(update)
    return num_of_elements // 2

for update in updates:
    is_correct = True
    for i, page in enumerate(interpret_update(update)):
       rules_to_check = find_relevant_rules(page, ordering_rules) 
       for rule in rules_to_check:
           if rule.split("|")[1] in interpret_update(update)[:i]:
               is_correct = False
    if is_correct:
        correct_updates.append(update)

for update in correct_updates:
    split_update = update.split(",")
    middle_updates.append(int(split_update[find_middle_update_index(split_update)]))
print(sum(middle_updates))

Part 1:

with open('input') as data:
    lines = [l.strip() for l in data.readlines()]
# Remove empty line
class Result():
    def __init__(self):
        self.count = 0


def analyze_lines(lines: list[str]):
    ans.count += get_rights(lines)
    ans.count += get_ups(lines)
    ans.count += get_downs(lines)
    ans.count += get_down_rights(lines)
    ans.count += get_down_lefts(lines)
    ans.count += get_up_lefts(lines)
    ans.count += get_up_rights(lines)
    for line in lines:
        ans.count += get_lefts(line)




def get_ups(lines: list[str]) -> int:
    up_count = 0
    for i_l, line in enumerate(lines):
        result = ""
        if i_l < 3:
            continue
        for i_c, char in enumerate(line):
            if char == "X":
                result = char
                result += "".join([lines[i_l - n][i_c] for n in range(1, 4)])
                if result == "XMAS":
                    up_count += 1
                else:
                    result = ""
    return up_count


def get_downs(lines: list[str]) -> int:
    down_count = 0
    for i_l, l in enumerate(lines):
        result = ""
        for i_c, c in enumerate(l):
            if c == "X":
                result += c
                try:
                    result += "".join([lines[i_l + n][i_c] for n in range(1, 4)])
                except IndexError:
                    result = ""
                    continue
                finally:
                    if result == "XMAS":
                        down_count += 1
                    result = ""
    return down_count


        
def get_lefts(line: str) -> int:
    left_count = 0
    for i, char in enumerate(line):
        if i < 3:
            continue
        elif char == "X" and line[i-1] == "M" and line[i-2] == "A" and line[i-3] == "S":
            left_count += 1
    return left_count


def get_rights(lines: list[str]) -> int:
    right_counts = 0
    for l in lines:
        right_counts += l.count("XMAS")
    return right_counts

def get_down_rights(lines: list[str]) -> int:
    down_right_count = 0
    for i_l, l in enumerate(lines):
        result = ""
        for i_c, c in enumerate(l):
            if c == "X":
                result += c
                try:
                    result += "".join(
                            [lines[i_l + n][i_c + n] for n in range(1,4)]
                            )
                except IndexError:
                    result = ""
                    continue
                finally:
                    if result == "XMAS":
                        down_right_count += 1
                    result = ""
    return down_right_count

def get_down_lefts(lines: list[str]) -> int:
    down_left_count = 0
    for i_l, l in enumerate(lines):
        result = ""
        for i_c, c in enumerate(l):
            if i_c < 3:
                continue
            if c == "X":
                result += c
                try:
                    result += "".join(
                            [lines[i_l + n][i_c - n] for n in range(1,4)]
                            )
                except IndexError:
                    result = ""
                    continue
                finally:
                    if result == "XMAS":
                        down_left_count += 1
                    result = ""
    return down_left_count

def get_up_rights(lines: list[str]) -> int:
    up_right_count = 0
    for i_l, l in enumerate(lines):
        result = ""
        if i_l < 3:
            continue
        for i_c, c in enumerate(l):
            if c == "X":
                result += c
                try:
                    result += "".join(
                            [lines[i_l - n][i_c + n] for n in range(1,4)]
                            )
                except IndexError:
                    result = ""
                    continue
                finally:
                    if result == "XMAS":
                        up_right_count += 1
                    result = ""
    return up_right_count


def get_up_lefts(lines: list[str]) -> int:
    up_left_count = 0
    for i_l, l in enumerate(lines):
        result = ""
        if i_l < 3:
            continue
        for i_c, c in enumerate(l):
            if i_c < 3:
                continue
            if c == "X":
                result = c
                try:
                    result += "".join(
                            [lines[i_l - n][i_c - n] for n in range(1,4)]
                            )
                except IndexError as e:
                    result = ""
                    continue
                finally:
                    if result == "XMAS":
                        up_left_count += 1
                    result = ""
    return up_left_count

ans = Result()
analyze_lines(lines)
print(ans.count)

Part 2:

with open('input') as data:
    lines = list(filter(lambda x: x != '', [l.strip() for l in data.readlines()]))
    
xmases = 0
for i in range(1, len(lines)):
    for j in range(1, len(lines[i])):
        if lines[i][j] == "A":
            try:
                up_back = lines[i-1][j-1]
                down_over = lines[i+1][j+1]
                up_over = lines[i-1][j+1]
                down_back = lines[i+1][j-1]
            except IndexError:
                continue
            else:
                if {up_back, down_over} == set("MS") and {up_over, down_back} == set("MS"):
                    xmases += 1

print(xmases)

I actually found part two A LOT easier than part 1.

I needed to read this. Thank you.

My first insinct was similar, add line breaks to the do and dont modifiers. But I got toa caught up thinking id have to keep track of the added characters, I wound up just abusing split()-

I did part 2 live with the python interactive shell. I deleted all the stuff where I was just exploring ideas.

part 1:

import re

def multiply_and_add(data: "str") -> int:
    digit_matches = re.findall(r"mul\(\d{0,3},\d{0,3}\)", data)
    result = 0
    for _ in digit_matches:
        first = _.split("(")[1].split(")")[0].split(",")[0]
        second = _.split("(")[1].split(")")[0].split(",")[1]
        result += int(first) * int(second)

    return result

with open("input") as file:
    data = file.read()


answer = multiply_and_add(data)
print(answer)

part 2:

Python 3.11.2 (main, Aug 26 2024, 07:20:54) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import solution2
<re.Match object; span=(647, 651), match='do()'>
>>> from solution2 import *
>>> split_on_dont = data.split("don't()")
>>> valid = []
>>> valid.append(split_on_dont[0])
>>> for substring in split_on_dont[1:]:
...     subsubstrings = substring.split("do()", maxsplit=1)
...     for subsubstring in subsubstrings[1:]:
...             valid.append(subsubstring)
...
>>> answer = 0
>>> for _ in valid:
...     answer += multiply_and_add(_)
...
>>> answer
103811193

this took me so fucking long and in the end i just went for brute force anyway. there are still remnants of some of previous, overly complicated, failed attempts, like the hideous global removed. In the end, I realized I was fucking up by using remove() instead of pop(), it was causing cases with duplicates where the removal of one would yield a safe result to count as unsafe.

def is_safe(report: list[int]) -> bool:
    global removed
    acceptable_range = [_ for _ in range(-3,4) if _ != 0]
    diffs = []
    if any([report.count(x) > 2 for x in report]):
        return False
    for i, num in enumerate(report[:-1]):
        cur = num
        next = report[i+1]
        difference = cur - next
        diffs.append(difference)
        if difference not in acceptable_range:
            return False
        if len(diffs) > 1:
            if diffs[-1] * diffs[-2] <= 0:
                return False
    return True

with open('input') as reports:
    list_of_reports = reports.readlines()[:-1]


count = 0

failed_first_pass = []
failed_twice = []

for reportsub in list_of_reports:
    levels = [int(l) for l in reportsub.split()]
    original = levels.copy()
    if is_safe(levels):
        safe = True
        count += 1
    else:
        failed_first_pass.append(levels)

for report in failed_first_pass:
    print(report)
    working_copy = report.copy()
    for i in range(len(report)):
        safe = False
        working_copy.pop(i)
        print("checking", working_copy)
        if is_safe(working_copy):
            count += 1
            safe = True
            break
        else:
            working_copy = report.copy()

print(count)

I like that, might try it myself, since I actually use those keys, but never wanted to jump to the highest or lowest visible line. Closest I get is gg and G.

The wire mad men

I fucking love halloween. If this is true, it’s one of the few redeeming aspects of USA culture.

Because it’s not downloading, which is the thing every one thinks is normal. It’s different, and potentially dangerous, which your phone will remind you any time you try to do it.

Removed by mod

Codewars is a cool leetcode-esque thing with less of the corporate dystopia sheen.

Long live soulseek

Sometimes the service freezes for me and cant be killed, requiring a restart.

For real. The main reason I switched to linux was because I was getting into progamming, and when I had to troubleshoot something on windows it was like half a dozen arcane solutions which might work, but the linux solution to the same problem was a terminal one liner. Maybe I’d feel differently if I was afraid of the terminal, but that’s one affliction I am blessedly free of.

Idk, I still think information wants to be free. If you figured it out just farting around, sophisticated malevolent actors are likely already doing similar things. Might be better to let the genie out of the bottle, so people can learn to be skeptical. Deep fakes are optimally effective when a majority still accepts the veracity of images as an article of faith.

Can you give an example of what you mean by a risky change?

Have you tried killing the other process using the dpkg lock?

lgtm