tarjan | Graph loop detection in Go using Tarjan 's algorithm
kandi X-RAY | tarjan Summary
kandi X-RAY | tarjan Summary
Tarjan is a graph loop detection function using Tarjan's algorithm. The algorithm takes a input graph and produces a slice where each item is a slice of strongly connected vertices. The input graph is in form of a map where the key is a graph vertex and the value is the edges in for of a slice of vertices. Based on an implementation by Gustavo Niemeyer (in mgo/txn): For API docs and examples see
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Top functions reviewed by kandi - BETA
- StrongConnect connects v to the data graph .
- Connections returns a list of connected nodes .
tarjan Key Features
tarjan Examples and Code Snippets
graph := make(map[interface{}][]interface{})
graph["1"] = []interface{}{"2"}
graph["2"] = []interface{}{"3"}
graph["3"] = []interface{}{"1"}
graph["4"] = []interface{}{"2", "3", "5"}
graph["5"] = []interface{}{"4", "6"}
graph["6"] = []interface{}{"3"
Community Discussions
Trending Discussions on tarjan
QUESTION
I have a main View Page, with a frame & image (inside drawable folder). on Back-end i am doing simple animation for 3 seconds
My Question:
How am I doing too much work by simple animation and image is 500x500. How to fix this error?
By the way, it works fine, if i remove animation code Task.WhenAll
ANSWER
Answered 2021-May-30 at 21:14OnAppearing
happens just before the page is diplayed.
To get smooth animation, you want the page to finish displaying before the animation starts. This requires the following two code changes:
DO NOT WAIT for the animation to finish - let OnAppearing return.
Delay the start of the animation.
Code:
QUESTION
I want my custom Control to fire a Command when a button is clicked.
...ANSWER
Answered 2021-Apr-09 at 06:04According to your description and code, you want to create Icommand in Custom control,
I do one sample that you can take a look, creating Icommand BindableProperty firstly.
TestControl:
QUESTION
I got a problem, my output is not correct
...ANSWER
Answered 2021-Mar-18 at 21:31The problem is in the line where you initialize the Lists for your adj-Array:
QUESTION
・I use Xamarin.Forms
・on UWP, it worked
・But on Android and ios, I don't know how implement it.
This is my code
...ANSWER
Answered 2021-Jan-22 at 02:01Swipe Gesture Recognizer is cross platforms and you can read the document about how to Add a swipe gesture recognizer.
Here is an example:
In xaml:
QUESTION
I have a long running video task in a Xamarin.Android
app; it decodes a video file using a MediaPlayer
into a custom OpenGL ES Surface
then queues another Surface
, encodes the data using a MediaCodec
and drains into a ByteBuffer
, which then is passed into a MediaMuxer
based upon encoder output ByteBuffer
availability. The operation works well and fast, until the video file written byte total is over ~1.3GB, at which point the video (but not audio) will lockup.
The app seems to have too many GREFs, as I'm watching them go up and down in realtime, until they're finally well above 46000 GREFs. It seems like the operating system (or app?) is having trouble dumping all of the GREFs via GC, which causes the app to get stuck in the middle of video processing. I'm monitoring the android resources and the total available memory never changes very much at the OS level; the cpu also seems to always have plenty of idle headroom (~28%).
I am outputting to the system console and watching the gref output logging using:
adb shell setprop debug.mono.log gref
The garbage collection seems to not be able to keep up after about 14 minutes. The GREF count goes up, then down, up, then down; eventually, it goes so high that the GREF count stays above 46k, with the following message looping:
...ANSWER
Answered 2020-Oct-10 at 21:12It turns out that all I had to do was comment out the line I had mentioned as being suspect:
var curDisplay = EGLContext.EGL.JavaCast().EglGetCurrentDisplay();
It runs in a loop that gets called thousands of times for a complete video to finish.
What must have been happening is that these EGLDisplay
instances (var
) were not being properly garbage collected. I would have thought they'd get automatically collected when the method is finished, but something was stopping that from happening. If you know more about this feel free to give a better answer; I'm not exactly sure what caused the finalizer
to get hung up on those objects.
That alone won't really do anyone very much in solving this type of problem, so here's how I figured it out:
first I added this code to the MainActivity
OnCreate
.. this writes the GREF logs to a file in the /download folder at the root of the droid device then loops and updates every 120 seconds (or whatever interval you choose)
QUESTION
I'm trying to implement the Tarjan's algorithm (to find strongly connected components in a graph).
I'm stuck in the dfs part of the algorithm where the components counter does not update itself properly. I think it's a problem with my recursion method but I'm not able able to fix it.
Here is the code:
...ANSWER
Answered 2020-May-31 at 20:30The issue is that the modification that a function execution brings to components_c
, nodes_c
, must carry back to the caller's variables with the same name, but that is not happening, because these variables are local to their own function execution context. The caller's variables with those names will not be modified by the recursive calls it makes, but they should.
You can solve this in different ways. One way is to make dfs_scc
a function that is defined within scc
, and to only define the two variables mentioned above in the scope of scc
. Then dfs_scc
can reference those variables via the nonlocal
keyword instead of getting them as arguments, and so modify them in a way that will be seen by all execution contexts in the recursion tree.
Here is how that looks:
QUESTION
I am trying to execute tarjans algorithm on a set of nodes from a graph, I can succesfully find Strongly Connected Components, however the root or the low value node is always off, even for SCC's with only 1 element the root node does not match that element For Example:
...ANSWER
Answered 2020-Aug-16 at 04:01I was indexing the root node wrong nodes[at] is the proper way to access the root node
QUESTION
I have the following (recursive) implementation of Tarjan's algorithm to find strongly connected components in a graph and it works fine:
...ANSWER
Answered 2017-Oct-01 at 13:02Here is a direct non recursive translation of the original recursive implementation (assuming it's correct):
QUESTION
Occasionally when importing photos or returning to the app from an activity such as watching videos our app locks up and gets a black screen, although some functions still continue underneath such as toasts. The end of the log consistently says:
...ANSWER
Answered 2020-Jan-16 at 02:52In case anyone has problems with this in the future, the destroy recordable surface code in the previous format is running upon return and intermittently. I moved it down to the code that executes on pause when the app surface is destroyed and it works now.
QUESTION
I am getting a crash from mono, from the logo I dont get anything specific which I can change in the code
...ANSWER
Answered 2019-Nov-21 at 16:12If anyone is facing the same issue, the solution it to switch the type of debugger from Tarjan
to New
Create a file
Environment.txt
and set the propertiesBuild Action
asAndroidEnvironment
Content will be
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