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QUESTION
I am currently trying to create a program that finds the maximum flow through a network under the constraint that edges with a common source node must have the same flow. It is that constraint that I am having trouble with.
Currently, I have the code to get all flow augmenting routes, but I am hesitant to code the augmentation because I can't figure out how to add in the constraint. I am thinking about maybe a backtracking algorithm that tries to assign flow using the Ford-Fulkerson method and then tries to adjust to fit the constraint.
So my code:
There is a graph class that has as attributes all the vertices and edges as well as methods to get the incident edges to a vertex and the preceding edges to a vertex:
ANSWER
Answered 2021-Jun-14 at 15:28I would guess that you have an input that specifies the maximum flow through each edge.
The algorithm is then:
Because edges with a common source must have same actual, final flow the first step must be a little pre-processing to reduce the max flow at each edge to the minimum flow from the common source.
apply the standard maximum flow algorithm.
do a depth first search from the flow origin ( I assume there is just one ) until you find a node with unequal outflows. Reduce the max flows on all edges from this node to the minimum flow assigned by the algorithm. Re-apply the algorithm.
Repeat step 3 until no uneven flows remain.
=====================
Second algorithm:
Adjust capacity of every out edge to be equal to the minimum capacity of all out edges from the common vertex
Perform breadth first search through graph. When an edge is added, set the flow through the edge the minimum of
- the flow into the source node divided by the number of exiting edges
- the edge capacity
- When search is complete sum flows into destination node.
For reference, here is the C++ code I use for depth first searching using recursion
QUESTION
I am very new to swift. So TLDR I have a collection view which I want to update after I click a button. I have seen various solutions and everyone suggesting to put collectionView.reloadData but I am not understanding where to put this line in my code. Any help will be appreciated. This is the view controller:
...ANSWER
Answered 2021-Jun-14 at 11:26You can try like this
QUESTION
I have a deployment with two containers, let's say A and B.
container A
serves http requests, the important container in the deployment. has liveness and readiness probes properly set.
Container B
serves as a proxy to a certain third party service through an ssh tunnel, has a very specific usecase, but for whatever reason, the third party service can be unreachable which puts this container on a crash loop.
The question is: How can I make this pod serve requests even if Container B
is on a crashloop?
TLDR; How to make a deployment serve requests if a specific container is on a crashloop?
...ANSWER
Answered 2021-Jun-13 at 20:51You kind of can't. You could remove the readiness probe from B but any kind of crash is assumed to be bad. Probably your best bet is to change B so that it doesn't actually crash out to where the kubelet can see it. Like put a little while true; do theoriginalcommand; sleep 1; done
bash loop on it or something so the kubelet isn't aware of it crashing. Or just make it not crash ...
QUESTION
TLDR: Create a CRC from every file(contentbased) in Directory.
Currently i used from Cpp20 the Filesystem Libary and tried to create a checksum for a file with "hash_value(p)". The thing is, the value does not change. Can you provide me some advice ho to accomplish a checksum, that changes when file content is changed. I would like to stay within the range of CPP libarys or what debian 10 can provide.
Now i tried this:
ANSWER
Answered 2021-Jun-12 at 16:59The thing is, the value does not change.
It's not supposed to. The filesystem::hash_value
is a hash of the path to the file, not the contents of the file. If you want to compute a CRC of the contents of a file, you're going to have to read those contents and apply a CRC algorithm to them.
QUESTION
I have a fairly large PHP project that I recently did a ton of refactoring on. This isn't a 'spaghetti code' situation but more so a 'wait a minute.. what files in this project are actually used?'
Is there an easy way to (similar to checking for code coverage?) pare down the file structure to only the files that are in use, or will I need to write some more code to determine that?
TLDR: I'm wondering if there's a tool that will keep track of what files are used in a project and what aren't
...ANSWER
Answered 2021-Jun-11 at 22:05Here's one method (among many I'd guess). This is not production ready - just a hackish tool for you to assemble a list that you can parse out later. Or an idea you can take and make more robust.
create a php file in a directory
tracker.php
QUESTION
Looked through past posts on SO but couldn't find the solution.
Environment:
- Mac OS Big Sur
- Rails 6.1.3.2
- ruby 3.0.1p64
Github repo https://github.com/tenzan/ruby-bootcamp
Added Bootsrtap 5 according to https://blog.corsego.com/rails-6-install-bootstrap-with-webpacker-tldr
To push to heroku I ran git push heroku main
Output:
...ANSWER
Answered 2021-Jun-10 at 00:32ModuleNotFoundError: Module not found: Error: Can't resolve '@popperjs/core'
suggests that you need to install @popperjs/core
.
QUESTION
In relation with : SQL: Find unavailability per minute of a ressource in an appointment
((click above link for schema + info))
I'm trying to run this query in an H2 SQL database. I'm a little unfamiliar with H2 syntax. I noted the column num in the WHERE clause that causes the issue.
Error:
Column "NUM" not found; SQL statement: CREATE FORCE VIEW ( SELECT "A"."APPOINTMENT_ID", "A"."APPOINTMENT_START_TIME", "A"."APPOINTMENT_END_TIME", "C"."COMPONENT_HOST_NAME", 'unavailable' AS "STATE" FROM "PUBLIC"."APPOINTMENT" "A" LEFT OUTER JOIN "PUBLIC"."APPOINTMENT_COMPONENT" "AC" ON "A"."APPOINTMENT_ID" = "AC"."APPOINTMENT_ID" INNER JOIN "PUBLIC"."COMPONENT" "C" ON "C"."COMPONENT_ID" = "AC"."COMPONENT_ID" WHERE ((CONVERT("A"."APPOINTMENT_START_TIME", TIME) <= DATEADD('minute', "NUM", CAST('00:00:00' AS TIME))) AND (CONVERT("A"."APPOINTMENT_END_TIME", TIME) >= DATEADD('minute', "NUM", CAST('00:00:00' AS TIME)))) AND ("C"."COMPONENT_ID" IN(1)) FETCH FIRST ROW ONLY ) AS SELECT "A"."APPOINTMENT_ID", "A"."APPOINTMENT_START_TIME", "A"."APPOINTMENT_END_TIME", "C"."COMPONENT_HOST_NAME", 'unavailable' AS "STATE" FROM "PUBLIC"."APPOINTMENT" "A" LEFT OUTER JOIN "PUBLIC"."APPOINTMENT_COMPONENT" "AC" ON "A"."APPOINTMENT_ID" = "AC"."APPOINTMENT_ID" INNER JOIN "PUBLIC"."COMPONENT" "C" ON "C"."COMPONENT_ID" = "AC"."COMPONENT_ID" WHERE ((CONVERT("A"."APPOINTMENT_START_TIME", TIME) <= DATEADD('minute', "NUM", CAST('00:00:00' AS TIME))) AND (CONVERT("A"."APPOINTMENT_END_TIME", TIME) >= DATEADD('minute', "NUM", CAST('00:00:00' AS TIME)))) AND ("C"."COMPONENT_ID" IN(1)) FETCH FIRST ROW ONLY [42122-200] 42S22/42122 (Help)
My code:
...ANSWER
Answered 2021-Jun-07 at 19:43I am not sure about the syntax. I am not very much familiar with H2. But isn't num
should be used in on clause instead of subquery ? Please check:
QUESTION
I'm creating a notebook that lets users select series to graph in a plotly bar chart and scatter plot. The graphs are generating, but in certain cases, its hard to even tell that the graph contains any data.
Take this graph for example. It is a graph of 5000 entries, all of which have data between -4 and 4. I'm graphing the index column on the x axis and the values on the y axis. TLDR: Whenever the x axis range is large, the bars are too small to see.
So far, I've tried changing the default color of the graph to be red so that the bars at least stand out more. But as you can see in the picture, its still hardly visible.
I know that there are ways to start plotly zoomed in already, which might be a good solution. But because I'm not sure what the data will look like ahead of time (it could be numeric, dates, strings, etc.), I've struggled to create a good heuristics to make the zoomed in graph look good.
Does anyone have suggestions about how to configure the plotly zoom settings or otherwise make the chart more visible on initial render?
I used the following code to generate the graph:
...ANSWER
Answered 2021-Jun-07 at 04:44By default, all data is displayed, but it is possible to limit the x-axis data to be displayed. Here you specify the granularity of data you want to display as initial. You can also change the granularity by clicking on the zoom icon at the top, but it will be more convenient if you set it so that you can use the scroll function of the mouse to zoom.
QUESTION
I'm getting the following warning when building a SvelteKit project with @sveltejs/adapter-static
, lazy-loading Firebase JS SDK 9.0.0-beta.2
:
[vite-plugin-svelte] The following packages did not export their
package.json file so we could not check the "svelte" field. If you had difficulties importing svelte components from a package, then please contact the author and ask them to export the package.json file. -firebase
Everything seems to work in real life (i.e. on the client with initially static routes that later make calls to the Firebase API.) Do I need to stress about this warning? Note -- I don't think I'm ever "polluting" the static routes with direct Firebase imports, but I may be doing it all wrong. Please see below for my methodology.
More Info- firebase: "9.0.0-beta.2"
- @sveltejs/adapter-static: "^1.0.0-next.13",
- @sveltejs/kit: "next",
I'm lazily importing Firebase 9 (beta) into a SvelteKit project. I expose async getters for the various Firebase things like this...
...ANSWER
Answered 2021-Jun-06 at 18:37The warning basically says that if the firebase
package exports any svelte components (which it doesn't), the svelte compiler won't pick it up and won't be able to optimize it. I have seen the warning too and I don't think there is anything to worry about.
QUESTION
Im building a static library and linking it to an executable. Im generating makefiles with cmake. When I generate the makefile for cl
(The compiler from visual studio) I have no problems, but when I generate the makefile for clang
I get an undefined symbol.
Versions:
cmake version 3.18.1
clang version 11.0.0
- Target: x86_64-pc-windows-msvc
- Thread model: posix
cl version 19.26.28806 for x64
I have the following structure for the proyect:
...ANSWER
Answered 2021-Jun-04 at 15:20I tested again with:
- clang version 12.0.0
- Target: x86_64-pc-windows-msvc
- Thread model: posix
And it worked corretly. Seems like it was a problem with clang 11
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