puzzlord
z3
puzzlord | z3 | |
---|---|---|
2 | 28 | |
28 | 9,783 | |
- | 1.4% | |
4.5 | 9.8 | |
12 months ago | 4 days ago | |
Python | C++ | |
- | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
puzzlord
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AMA: We are the creators of The Puzzler Hunt. Ask us anything!
We wrote the metapuzzles first, of course. IIRC I believe A Man of Letters was the first of the metapuzzles that we actually used to be written and tested (although that's before we started using https://github.com/galacticpuzzlehunt/puzzlord to manage puzzle lifecycle, so I don't have the exact data in front of me). We were also working on a meta version of Resolution before we ultimately decided to rebuild it as a regular puzzle instead of a metapuzzle (and this was true of Art Gallery as well). The first regular puzzle to enter testsolving was A Curious Pairing, and the first regular puzzle to complete testsolving was Institutional Knowledge. Magic Words was the last regular puzzle we completed (and we only finished testing it on May 11 - a bit too close to release date for comfort!). Using number of Puzzlord comments as a proxy metric for "went through the most changes", Art Gallery had the most (269), followed by Into the Words (255) and then Magic Words (250).
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MIT Puzzle Hunt 2021 Recap
There's a few hours of reading in here, but even just skipping around through the post has given me a ton of new ideas for my hunts. If you're confident using Github, you can even download their program used for editing and testing puzzles.
z3
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Ask HN: What is the current state of "logical" AI?
See https://cacm.acm.org/magazines/2023/6/273222-the-silent-revo... and also modern production rules engines like https://drools.org/
Oddly, back when “expert system shells” were cool people thought 10,000 rules were difficult to handle, now 1,000,000 might not be a problem at all. Back then the RETE algorithm was still under development and people were using linear search and not hash tables to do their lookups.
Also https://github.com/Z3Prover/z3
Note “the semantic web” is both an advance and a retreat in that OWL is a subset of first order logic which is really decidable and sorta kinda fast. It can do a lot but people aren’t really happy with what it can do.
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Lean4 helped Terence Tao discover a small bug in his recent paper
Code correctness is a lost art. I requirement to think in abstractions is what scares a lot of devs to avoid it. The higher abstraction language (formal specs) focus on a dedicated language to describe code, whereas lower abstractions (code contracts) basically replace validation logic with a better model.
C# once had Code Contracts[1]; a simple yet powerful way to make formal specifications. The contracts was checked at compile time using the Z3 SMT solver[2]. It was unfortunately deprecated after a few years[3] and once removed from the .NET Runtime it was declared dead.
The closest thing C# now have is probably Dafny[4] while the C# dev guys still try to figure out how to implement it directly in the language[5].
[1] https://www.microsoft.com/en-us/research/project/code-contra...
[2] https://github.com/Z3Prover/z3
[3] https://github.com/microsoft/CodeContracts
[4] https://github.com/dafny-lang/dafny
[5] https://github.com/dotnet/csharplang/issues/105
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Programming Languages Going Above and Beyond
I believe, Nim also has this functionality, although, it uses the [0]Z3Prover tool with a nim frontend [1]"DrNim" for proving.
[0]https://github.com/Z3Prover/z3
- Modern SAT solvers: fast, neat and underused (2018)
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If You've Got Enough Money, It's All 'Lawful'
Don't get me wrong, there are times when Microsoft got it right the first time that was technically far superior to their competitors. Windows IOCP was theoretically capable of doing C10K as far back in 1994-95 when there wasn't any hardware support yet and UNIX world was bickering over how to do asynchronous I/O. Years later POSIX came up with select which was a shoddy little shit in comparison. Linux caved in finally only as recently as 2019 and implemented io_uring. Microsoft research has contributed some very interesting things to computer science like Z3 SAT solver and in collaboration with INRIA made languages like F* and Low* for formal specification and verification. But all this dwarfs in comparison to all the harm they did.
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Constraint Programming 'linking' variables
Z3 theorem prover SMT solver might help you.
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General mathematical expression analysis system
Other than that, you should look at Z3 which is pretty damn good at these sort of theorems/constraints.
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-🎄- 2022 Day 21 Solutions -🎄-
In the end I used Z3 Julia bindings instead. The hardest part was to get the result back from it, because I kept running into assertion violations from inside Z3
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Question about Predicate Transformer Semantics
I'm trying to learn a little bit about Predicate Transformer Semantics (PTS) as part of a quick exploration of Z3.
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The Little Prover
> And you propose me instead to go and reverse engineer library Js code which I am not that proficient in, and rewrite all code in Java instead?..
Yes, rather than demand others cater to your whims, frankly.
Do you realise how hypocritical it sounds to complain that you are not proficient in Javascript, when others might not be proficient in ?
Go use Z3 if you need a prover in C++ (or Java), its far more robust (provided its the type you're after) than someones 700 LoC JavaScript implementation.
https://github.com/Z3Prover/z3
What are some alternatives?
grilops - a GRId LOgic Puzzle Solver library
employee-scheduling-ui - An UI component for Employee Scheduling application.
advent-of-code - My solutions to http://adventofcode.com/ :)
advent-of-code-go - All 8 years of adventofcode.com solutions in Go/Golang; 2015 2016 2017 2018 2019 2020 2021 2022
magmide - A dependently-typed proof language intended to make provably correct bare metal code possible for working software engineers.
ikos - Static analyzer for C/C++ based on the theory of Abstract Interpretation.
androguard - Reverse engineering and pentesting for Android applications
picoCTF - The platform used to run picoCTF 2019.
returns - Make your functions return something meaningful, typed, and safe!
adventofcode - Answers to Advent of Code
codechecker - CodeChecker is an analyzer tooling, defect database and viewer extension for the Clang Static Analyzer and Clang Tidy
Kind2 - A next-gen functional language [Moved to: https://github.com/Kindelia/Kind]