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L ong/Nose :marseylongpost:

Serial Serious Replyer :marseylongpost:

11mo ago (text post) 294 thread views #226327

rDramaAdvent of Code Day 4: Back on Track Edition

Summary for those just joining us:

Advent of Code is an annual Christmas themed coding challenge that runs from December 1st until christmas. Each day the coding problems get progressively harder. We have a leaderboard and pretty good turnout, so feel free to hop in at any time and show your stuff!

Whether you have a single line monstrosity or a beautiful phone book sized stack of OOP code, you can export it in a nice little image for sharing at https://carbon.vercel.app

What did you think about today's problem?

1/5

2/5

3/5

4/5

5/5

https://adventofcode.com/2023

Our Code is 2416137-393b284c (No need to share your profile, you have the option to join anonymously if you don't want us to see your github)

Block /h/slackernews

Jump in the discussion.

No email address required.

QuadNarca what/ever Like clockwork :marseytime:

11mo ago #5495514

It was easier than yesterday, managed to complete it with much fewer lines

5 Context

HeyMoon hey/moon :marseyfoxgloveyourself:

touch foxglove NOW :!marseyfoxgloveyourself:

11mo ago #5495543

!codecels

7 Context

ihsoy jew/jew

11mo ago #5494468

Tried to use the new std::views std library which is kinda useful, but gives absolutely unhelpful error messages:

<g>\>[build] FAILED: day04/CMakeFiles/day04.dir/main.cpp.o </g>
[build] /usr/bin/ccache /usr/bin/clang++-17 -DINPUT_DIR=\"/home/ihsoy/adventofcode/inputs/\" -DSCN_HEADER_ONLY=0 -I/home/ihsoy/adventofcode/.cache/CPM/scn/ee384e4dfeb40efb93d1b2a397a81e8027027f77/include -stdlib=libc++ -g -std=c++23 -fcolor-diagnostics -MD -MT day04/CMakeFiles/day04.dir/main.cpp.o -MF day04/CMakeFiles/day04.dir/main.cpp.o.d -o day04/CMakeFiles/day04.dir/main.cpp.o -c /home/ihsoy/adventofcode/day04/main.cpp
[build] /home/ihsoy/adventofcode/day04/main.cpp:53:95: error: invalid operands to binary expression ('std::__1::ranges::transform_view<std::__1::ranges::filter_view<std::__1::ranges::split_view<std::__1::ranges::subrange<const char *>, std::__1::ranges::single_view<char>>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)>' and 'int')
[build]    53 |         auto numbers_won = numbers_played | std::views::filter([](https://auto number) { return number%2==0; });
[build]       |                                                                                         ~~~~~~^~
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__type_traits/invoke.h:337:10: note: in instantiation of function template specialization 'day03::solution(const std::vector<std::string> &)::(anonymous class)::operator()<std::__1::ranges::transform_view<std::__1::ranges::filter_view<std::__1::ranges::split_view<std::__1::ranges::subrange<const char *>, std::__1::ranges::single_view<char>>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)>>' requested here
[build]   337 | decltype(std::declval<_Fp>()(std::declval<_Args>()...))
[build]       |          ^
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__type_traits/invoke.h:347:19: note: while substituting deduced template arguments into function template '__invoke' [with _Fp = (lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64) &, _Args = <std::__1::ranges::transform_view<std::__1::ranges::filter_view<std::__1::ranges::split_view<std::__1::ranges::subrange<const char *>, std::__1::ranges::single_view<char>>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)> &>]
[build]   347 |   static decltype(std::__invoke(std::declval<_XFp>(), std::declval<_XArgs>()...)) __try_call(int);
[build]       |                   ^
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__type_traits/invoke.h:353:28: note: while substituting deduced template arguments into function template '__try_call' [with _XFp = (lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64) &, _XArgs = (no value)]
[build]   353 |   using _Result = decltype(__try_call<_Fp, _Args...>(0));
[build]       |                            ^
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__type_traits/invoke.h:401:24: note: in instantiation of template class 'std::__invokable_r<void, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64) &, std::__1::ranges::transform_view<std::__1::ranges::filter_view<std::__1::ranges::split_view<std::__1::ranges::subrange<const char *>, std::__1::ranges::single_view<char>>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)> &>' requested here
[build]   401 |     : public enable_if<__invokable<_Fp, _Args...>::value, typename __invokable_r<void, _Fp, _Args...>::_Result> {};
[build]       |                        ^
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__type_traits/invoke.h:452:45: note: in instantiation of template class 'std::__invoke_of<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64) &, std::__1::ranges::transform_view<std::__1::ranges::filter_view<std::__1::ranges::split_view<std::__1::ranges::subrange<const char *>, std::__1::ranges::single_view<char>>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>, (lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)> &>' requested here
[build]   452 | struct _LIBCPP_TEMPLATE_VIS invoke_result : __invoke_of<_Fn, _Args...> {};
[build]       |                                             ^
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__type_traits/invoke.h:455:1: note: (skipping 39 contexts in backtrace; use -ftemplate-backtrace-limit=0 to see all)
[build]   455 | using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
[build]       | ^
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__concepts/invocable.h:27:21: note: while substituting template arguments into constraint expression here
[build]    27 | concept invocable = requires(_Fn&& __fn, _Args&&... __args) {
[build]       |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[build]    28 |   _VSTD::invoke(_VSTD::forward<_Fn>(__fn), _VSTD::forward<_Args>(__args)...); // not required to be equality preserving
[build]       |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[build]    29 | };
[build]       | <del>
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__ranges/range_adaptor.h:61:18: note: while checking the satisfaction of concept 'invocable<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64)>>>, std::__1::ranges::drop_view<std::__1::ranges::transform_view<std::__1::ranges::split_view<std::string_view, std::__1::ranges::single_view<char>>, std::__range_adaptor_closure_t<std::__compose_t<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__transform::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)>>>, std::__range_adaptor_closure_t<std::__compose_t<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>>>, std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__split_view::__fn, std::tuple<char>>>>>>>>> &>' requested here
[build]    61 |                  invocable<_Closure, _View>
[build]       |                  ^</del>~~~~~~~~~~~~~~~~~~~~~~~
[build] /usr/lib/llvm-17/bin/../include/c++/v1/__ranges/range_adaptor.h:61:18: note: while substituting template arguments into constraint expression here
[build]    61 |                  invocable<_Closure, _View>
[build]       |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
[build] /home/ihsoy/adventofcode/day04/main.cpp:53:43: note: while checking constraint satisfaction for template 'operator|<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64)>>>>' required here
[build]    53 |         auto numbers_won = numbers_played | std::views::filter([](https://auto number) { return number%2==0; });
[build]       |                                           ^
[build] /home/ihsoy/adventofcode/day04/main.cpp:53:43: note: in instantiation of function template specialization 'std::__1::operator|<std::__1::ranges::drop_view<std::__1::ranges::transform_view<std::__1::ranges::split_view<std::string_view, std::__1::ranges::single_view<char>>, std::__range_adaptor_closure_t<std::__compose_t<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__transform::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)>>>, std::__range_adaptor_closure_t<std::__compose_t<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>>>, std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__split_view::__fn, std::tuple<char>>>>>>>>> &, std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64)>>>>' requested here
[build] /home/ihsoy/adventofcode/day04/main.cpp:53:43: error: invalid operands to binary expression ('invoke_result_t<__range_adaptor_closure_t<__bind_back_t<__fn, tuple<int>>>, transform_view<split_view<string_view, single_view<char>>, __range_adaptor_closure_t<__compose_t<__range_adaptor_closure_t<__bind_back_t<__fn, tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)>>>, __range_adaptor_closure_t<__compose_t<__range_adaptor_closure_t<__bind_back_t<__fn, tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>>>, __range_adaptor_closure_t<__bind_back_t<__fn, tuple<char>>>>>>>> &>' (aka 'std::__1::ranges::drop_view<std::__1::ranges::transform_view<std::__1::ranges::split_view<std::string_view, std::__1::ranges::single_view<char>>, std::__range_adaptor_closure_t<std::__compose_t<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__transform::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:44:50)>>>, std::__range_adaptor_closure_t<std::__compose_t<std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:42:89)>>>, std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__split_view::__fn, std::tuple<char>>>>>>>>>') and '__range_adaptor_closure_t<__bind_back_t<__fn, tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64)>>>' (aka 'std::__range_adaptor_closure_t<std::__bind_back_t<std::__1::ranges::views::__filter::__fn, std::tuple<(lambda at /home/ihsoy/adventofcode/day04/main.cpp:53:64)>>>'))
``

7 Context

longpostbot tl/dr DIDN'T READ LOL! Go essaypost elsewhere. :marseyexciteddance:

ihsoy 11mo ago #5494469

7 Context

L ong/Nose :marseylongpost:

Serial Serious Replyer :marseylongpost:

ihsoy 11mo ago #5498553

>c++

>New library

Brought it on yourself tbh :marseyboo#mer:

3 Context

L ong/Nose :marseylongpost:

Serial Serious Replyer :marseylongpost:

11mo ago #5494403

I did part two with List<Stack<string>>

lmao can't post code but it took like 3 minutes to run

7 Context

AverageBen10Enjoyer ben/10 :marseyben10:

L 11mo ago #5494489

I'm surprised he didn't structure it so that you couldn't brute force it. Congrats

3 Context

L ong/Nose :marseylongpost:

Serial Serious Replyer :marseylongpost:

AverageBen10Enjoyer 11mo ago #5494525

I thought I did something wrong because my debug messages showed the stack 368000 layers deep at card #37 but it went pretty quick after that

4 Context

shit_game she/her "I LOVE YOUR PROFILE CSS" -carp L 11mo ago #5497166

i tried doing a stack and popping cards off the bottom but it got to something like 770,000 cards long after a while and i gave up. i think it might have worked if i fricked off for a few hours but my answer was over 8,000,000 so i didnt bother sticking around to find out if it would or if i would have gotten an indexing error :marseycorner:

2 Context

FrozenChosin they/them (north) korean war veteran 11mo ago #5494069

The instructions for 2 were very confusing but the actual puzzle was pretty simple

7 Context

AverageBen10Enjoyer ben/10 :marseyben10:

FrozenChosin 11mo ago #5494488

I was scared that part 2 was going to be some hideous mathematical trick but I trusted that Eric wouldn't do that in day 4 and it was OK.

3 Context

finbarfin beep/boop AverageBen10Enjoyer 11mo ago #5495459

I spent more time on part 2 thinking there must be some algorithm I was missing and then like 1 minute going "frick it" and writing a double for loop like apparently everyone else did.

6 Context

L ong/Nose :marseylongpost:

Serial Serious Replyer :marseylongpost:

finbarfin 11mo ago #5498567

Usually with these problems I focus on quick and dirty first (timed leaderboards lmao) then after I submit I spend some time thinking about the "right way" when the mind goblins aren't telling me to hurry

3 Context

SleighOut ping/pong Ping "Gock or not" @WayOut for a forensic gock assessment. 100dc per analysis. 11mo ago #5494774

im literally screaming, Easiest one yet

Step 1:

Step 2:

6 Context

zip zap/zop SleighOut 11mo ago #5494791

Nim is so pretty :marseystars:

3 Context

SleighOut ping/pong Ping "Gock or not" @WayOut for a forensic gock assessment. 100dc per analysis. zip 11mo ago #5494807

ok so ikr, its like python with a type system thats not been frankensteined where it doesnt belong

im literally screaming, One thing I dont like is that you gotta import so much stuff for basic builtins, like I had to import std/math like just to get the ^ operator

4 Context

not-dua-lipa trickno/logist rdrama's #1 ContraPoints stan :taylove:

youtube.com/@ContraPoints?sub_confirmation=1 11mo ago #5493998 Edited 11mo ago

Another "the hardest part is parsing the input" question :marseyyawn:

s←~⍤∊⍨⊆⊢ ⋄ n←≢r←{⍎¨'|'s 2⊃':'s ⍵}¨⊃⎕NGET'i4.txt'1
⎕←+/⌊2*1-⍨w←+/¨¨∊/¨r
t←n/1 ⋄ w{t⊢←t+(⍵⊃t)×n↑(⍵\0),⍺\1}¨⍳n ⋄ ⎕←+/t

6 Context

Corvus they/them :!marseycorvus:

Stark Raven Mad :marseycorvus:

11mo ago #5497127

A neat little dynamic programming method of solving it. Just start at the end and use your previous solutions to calculate the current one.

5 Context

89wc th/thh kalm 11mo ago #5495871 Edited 11mo ago

Alright.. so..... It's been executing for about 3-5 hours now

I'm unable to actually verify that the 2nd part is solved but I'm pretty sure it is

Can't tell if

>skill issue

or shell issue :marseythinkorino:

either way I'm gonna switch to php I am not skilled enough to continue with shell lmao

Good ol' php to save the day :marseyembrace:

5 Context

LetsUnpackThis boo/hoo 11mo ago #5495066

Sets make this pretty easy

f = open('AOC2023Day4.txt')
import numpy as np
from collections import defaultdict
numscr = defaultdict(lambda: 1)
numscr[1] = 1
lines = f.read().strip().split('\n')
total = 0
i = 1
for line in lines:
   line = line.split(':')[-1].split('|')
   #print(line[1].strip().split(' '))
   winning = set([int(i) for i in line[0].strip().split(' ') if i != ''])
   nums = set([int(i) for i in line[1].strip().split(' ') if i != ''])
   mine = winning.intersection(nums)
   #print(mine)
   add = 0
   i += 1
   if len(mine) > 0:
       add = np.power(2,len(mine)-1)
       for j in range(i,i+len(mine)):
           numscr[j] += numscr[i-1]
   total += add
#print(numscr)
ncards = 0
for i in range(len(lines)):
   ncards += numscr[i]
print(ncards)
print(total)

5 Context

zip zap/zop 11mo ago #5494729 Edited 11mo ago

I agree with everyone else that the hardest part was understanding what Part 2 wanted

I believe the reason to put up with all the type shit cluttering my code is because the filters/maps are lazy eval'd and ready to be parallelised as-is, but I'm wondering if I really care

5 Context

mineral they/them 劇的 :marseyravegigaspeed:

11mo ago #5497125

A Mimic Ate 16 Coins!

yesterday's was really annoying and after four days of string parsing problems, it was pretty easy

edit: oh yeah I should have used hash for performance reasons but oh well.

4 Context

TriHard snake/ass scuffed jays 11mo ago #5494809

Day 4 and I already crashed the compiler:

Passing anything but an int or string to arrayWith causes an internal compiler error. This includes integer literals.

4 Context

terryveisin dev/null 11mo ago #5493980

I am clinically r-slurred and wasted like 15 minutes repeatedly coding the wrong implementation of what they wanted in the second part, checking the spec, and then modifying my code to a new, still incorrect, behavior

4 Context

TedCommandments yob/wanker This is serious mum 11mo ago #5493967 Edited 11mo ago

Hardest part was understanding wtf part 2 wanted me to do.

4 Context

8 live/laugh/love :marseygravedance:

11mo ago #5493935

Like day 2 felt easier than day 1, today was easier than yesterday.

3 Context

TheProphet Dino/saur 8 11mo ago #5496403

Weekend tasks are usually harder, he's kind like that

3 Context

L ong/Nose :marseylongpost:

Serial Serious Replyer :marseylongpost:

TheProphet 11mo ago #5498577

Yeah I think it's planned in a way to try and stop people from burning out before they actually hit their limit

1 Context

Gibberish gibb/erish :marseyautism:

11mo ago #5497383 Edited 11mo ago

FRICK c++ I'm done with it after today's expedition into "dude, why isn't my vector erasing" :marseyraging#:

2 Context

shit_game she/her "I LOVE YOUR PROFILE CSS" -carp 11mo ago #5497129

idk if im burnt out from tutoring bootcampers worse than i am over zoom for 3 hours or if its because i havent had a drink in 3 days but i still have no fricking clue what part 2 is trying to ask me to do so i shamelessly stole that part

2 Context

not-dua-lipa trickno/logist rdrama's #1 ContraPoints stan :taylove:

youtube.com/@ContraPoints?sub_confirmation=1 shit_game 11mo ago #5497503 Edited 11mo ago

The wording is retarded, they should've given a walkthrough.

Cards (you start with 1 of each): 1 1 1 1 1 1

Scores (from part 1): 4 2 2 1 0 0

Position 1: 1 card at this position, each scores 4. So add 1 to each of the next 4 cards.

       v
Cards: 1 1 1 1 1 1
  Add: 0 1 1 1 1 0
  New: 1 2 2 2 2 1

Position 2: 2 cards at this position, each scores 2. So add 2 to each of the next 2 cards.

         v
Cards: 1 2 2 2 2 1
  Add: 0 0 2 2 0 0
  New: 1 2 4 4 2 1

Position 3: 4 cards at this position, each scores 2. So add 4 to each of the next 2 cards.

           v
Cards: 1 2 4 4 2 1
  Add: 0 0 0 4 4 0
  New: 1 2 4 8 6 1

Position 4: 8 cards at this position, each scores 1. So add 8 to each of the next 1 card.

             v
Cards: 1 2 4 8  6 1
  Add: 0 0 0 0  8 0
  New: 1 2 4 8 14 1

Position 5: 14 cards at this position, each scoring 0. So add 14 to each of the next 0 cards (nothing).

                v
Cards: 1 2 4 8 14 1
  Add: 0 0 0 0  0 0
  New: 1 2 4 8 14 1

Position 6: 1 card at this position, each scoring 0. Add nothing.

                  v
Cards: 1 2 4 8 14 1
  Add: 0 0 0 0  0 0
  New: 1 2 4 8 14 1

Final cards: 1 2 4 8 14 1

Sum: 30

4 Context

longpostbot tl/dr DIDN'T READ LOL! Go essaypost elsewhere. :marseyexciteddance:

not-dua-lipa 11mo ago #5497504

I don't know what you said, because I've seen another human naked.

1 Context

89wc th/thh kalm shit_game 11mo ago #5498217

it's saying duplicate the subsequent cards for as many "wins" as "current card" has

Card 1 has 4 wins, now Card 1 gets its original point, and cards ( 2 + 3 + 4 + 5 ) get a point because of Card 1's wins.

Onto Card 2, it gets the initial/original point, on top of the 1 point it had received from Card 1. So Card 2 has 2 points. Say it had just 1 win. With just 1 win on Card 2, it gives a point to only the next Card 3. But it does it again for each point it has, and gives Card 3 another point. Now Card 3 has 1 point from Card 1, 1 point from Card 2, and 1 point grom Card 2's repeat. So 3 points.

When Card 3's up, on top of the 3 points it has received, it also gets its initial/original point now that it's up.. so 4 points. But say it didn't have any wins, and basically passes 0 points down, four times. The game is still on because the next Card 4 had received a point from the first Card 1 and has 3 wins.

Card 4 has the 1 point from Card 1, and gets its initial/original point, so 2 points. It gives the next 3 cards a point, then since it's got one more copy it does it again so Card 5, 6, and 7 are given a total of 2 points each. Continues on until there's a dead end, then u sum all the points.

My answer was 11,787,590 lmao

3 Context

longpostbot tl/dr DIDN'T READ LOL! Go essaypost elsewhere. :marseyexciteddance:

89wc 11mo ago #5498218

Your pulitzer's in the mail

1 Context

Snappy beep/boop Join !friendsofsnappy :marseysnappynraged:

11mo ago #5493869

:#marseymerchantelf:

Snapshots:

https://carbon.vercel.app:

https://adventofcode.com/2023:

2 Context

BayBeeJesus She/Her :crystalheart:

BE KIND I'M FEELING VERY DISABLED TODAY :crystalheart:

11mo ago #5495603

:marseywinemom:

1 Context

Deleted by author

gerudo p/n ILIKECATS 11mo ago #5493894

are we looking at the same problem? Its a set intersection problem, pythoncels solved this in 6 chars.

2 Context

ILIKECATS mar/sey :#marseylove::#marseylove::#marseylove::#marseylove: gerudo 11mo ago #5493911

Oh wait I'm r-slurred, I thought this was yeaterdays

3 Context

Deleted by author

longpostbot tl/dr DIDN'T READ LOL! Go essaypost elsewhere. :marseyexciteddance:

ihsoy 11mo ago #5494460

That's great and all, but I asked for my burger without cheese.

1 Context

Deleted by author

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