bitvec | A crate for managing memory bit by bit

A program receives a map vars, which maps the name and type of variables in pathCons. Now, I want to solve this path_cons, I designed the following parse() function to try to implement it. However, to make solver identify all variables in path_cons, I have to first declare them. But their names are recorded into a variable, so how do I implement my goal?

I have a system of equations to solve in which there is some equations of hamming weight. Hamming weight is generally the number of 1's in binary representation of a number. I tried to solve in Z3 SMT Solver, but it outputs an error stating " b'there is no current model". I am trying to find a 32-bit number with a given hamming weight and some equations.

In examples below, I am trying to find a number(0 to 2^5-1) with hamming weight equal to 3.

I'm implementing a Bitvector. My question is - How do I implement the slice functionality? Here is my code (things I've tried follow after the code):

I am currently trying to build a huffman encoding program and am struggling with a problem I have while traversing my generated huffman tree to create a lookup table. I decided to implement said traversal with a recursive function. In the actual implementation I use the bitvec crate to save bitsequences, but for simplicitly I will use Vec in this post.

The idea I had was to save a collection of all codewords in the Vec codewords and then only save a slice out of that vector for the actual lookup table, for which I used a HashMap.

The issue is how exactly I would solve adding a 0 or a 1 for both the left and right traversal. My idea here was to save a clone of a slice of the current sequence, append a 0 to codewords, then append that clone to the end of codewords after traversing to the left so that I can push a 1 and traverse to the right. The function I came up with looks like this:

I am trying to solve some nonlinear equation on boolean variables and at the same time I want to compute the hamming weight (i.e. involve normal addition of boolean variables).

I am using Z3 Smt Sovler & Bitvec to do so, but it seems there is some restriction on the number of monomials that can be passed into an equation.

I am therefore looking for some alternative solution;

Problem:

Based on this very helpful answer I rewrote my solver-for-a-stateful-program to use the Query monad and an ever-increasing list of SMT variables standing for the inputs. I expected one of two outcomes from this: either the first part (generating the SMTLib output) is sped up a lot and becomes usable, or it still remains so slow that it might as well not work.

However, instead I get an error message from the SMT solver (Z3 in my case) complaining about a missing SMT variable in the SMTLib output. And looking at the output with verbose = True, lo and behold there really is a variable that is only referred to, but not defined:

in past i write some Z3Py code that i want now convert to C# .NetCore. I check many examples but i have some problems :-)

I have defined function with name MyFun, that accept parameter and return variable based on value. Simple example:

Each time I run my project, a different order of the Z3 formulae is generated. Even though the formula is exactly the same, it is reordered in different runs and as a result, the answers attained from Z3 are different in every run. This is causing issues since I need an optimal set which should be exactly the same in each run.

For example,

1. the first run is:

In the code below I tried to add some extra information to BitVec variable, then created some condition, and then use get_vars to get back the x variable but it is always different because the output of this little snippet is False. I expected to be the same object but it seems that when x > 3 is executed, BoolRef is created and x is lost. Also, I expected that x.ast would be the same as var.ast but the instances are different.