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QUESTION
I looked up iterative Graph DFS and it showed using a stack for the edges but this is producing a different order vs recursive DFS. I tried using a queue for the iterative DFS as well but the only way I could get the same order as recursive DFS was using a stack of Map iterators come back to and resume the iteration over edges, but I feel like there is probably a better way to do it.
I've included each DFS method, recursive, iterative stack, iterative queue, and iterative Map iterators with the order of each being logged:
...ANSWER
Answered 2021-May-30 at 23:12Your stack of map iterators has the same result order as the recursive version because it accurately represents the state of the for
loop in the recursive function.
To contrast your simple stack version, look at the order in which edges are processed after all of them have been pushed onto to the stack: the next iteration takes the top one, which was pushed last; then the second-to-last and so on, essentially processing the edges in reverse order.
If you want to reproduce the same result as the recursive version, you have to stack the neighbors of each node in reverse. Also you'll want to skip processing them again if they have been visited in the meantime (i.e. if they had been put on the stack multiple times).
QUESTION
The broken method: hasPathDFSBroken
Working version: hasPathDFS
The working version has a contrived param added to make it work which I'd rather avoid.
I'm trying to understand why in the broken version when the call stack starts unwinding at LIM as currNode and it gets back to MEX as the currentNode, why does it not resume the unfinished for loop over MEX's neighbors?
Any help would be greatly appreciated. Thanks!
...ANSWER
Answered 2021-May-24 at 23:17why doesn't the unfinished for loop resume over MEX's neighbors?
Because the return
statement you have inside the loop immediately breaks from the loop and the function.
Instead, you need to look at the return value and continue with the loop if the recursive call hasn't found the destination:
QUESTION
I am using ionic with vue. there is tab bar which has child tab when i change that bar it calls mounted function of component but it calls that function only first time for all other time it shows previous data.
here is tab bar
...ANSWER
Answered 2021-May-06 at 17:13You are looking for ionic lifecycle ionViewWillEnter
, it will fire every time user enters the page:
QUESTION
Currently I have this string:
...ANSWER
Answered 2021-Apr-29 at 21:10var str = "Hello, I'm <%first%> <%last%>, and I <3 being a <%occupation%>. I am > blah";
var arr = str.split('<%');
var final = [], vala, thetype;
arr.forEach(val => {
vala=val.split('%>');
thetype='string';
if (vala.length>0) thetype='token';
final.push({type: thetype, value: vala[0]});
})
QUESTION
For a project I need to create a search bar. The search results need to be displayed in a grid. The items should be next to each other and two rows high. If there are more results I need to show a button +32
to display all the results.
The problem I am facing is that I have no idea how to accomplish this. I have used flexbox and flex-wrap in order to get new items to be shown in the next line when they don't fit on the previous one. But I don't know how to only display the first two lines.
...ANSWER
Answered 2021-Apr-26 at 14:33Here is a quick solution, although it doesn't calculate the length yet.
QUESTION
Given a string and a style array render HTML pretty much like a rich text editor.
For example: 'Hello, world', [[0, 2, 'i'], [4, 9, 'b'], [7, 10, 'u']]
Output: Hello, world
Keep in mind that tag gets placed before the tag and after it as the insertion index overlaps it.
So far this is my answer:
...ANSWER
Answered 2021-Apr-17 at 22:40You could use a stack to keep track of the tags that were previously opened and not closed. And on each letter, check whether a tag needs to be closed (popped off the stack), or a new one opened (pushed to the stack):
QUESTION
I started my first React Project and want to build my Design Portfolio by myself. So it's also my first time working with React Router or try to combine Components with each other by clicking a button.
I want to render all standard components in App.js and want to link only my project with the description project pages with a button. So if the user clicked on the button they will linked to the description of this project. But surprise it doesn't work. My problem now is that the description page rendered in the same page as the standard component like "About, Navbar, Contact" rendered. But i want that the description page from the projects rendered in a seperate page. What can i do that this work?
I guess this is my relevant code to understand what i've made so far. But if you need more snippets please say it. :)
...ANSWER
Answered 2021-Apr-17 at 00:41Any component not inside a specific route will be shown on all routes.
In your case, since the About
, Contact
, and Sidebar
components are outside the specific routes, they will be rendered for all routes - including the description page.
Try putting the components that you don't want rendered on the description page inside their own route. For example, the following should avoid rendering the About
, Contact
, and Sidebar
components on the description page (note the comments in the code).
QUESTION
I need to write a function that receives a string and the number of groups, and then returns all the possible slicing options.
i.e. for func('hello', 3)
:
ANSWER
Answered 2021-Apr-13 at 10:42You can use more itertools.
QUESTION
I want to hide a part of a string using my own function. For e.g: $string = "hello this is my password";
. If my function is HashPartOfString($string), I want to put my string in this function and have an output like this: hel***************ord
. How should I do that?
ANSWER
Answered 2021-Apr-11 at 15:24if you alltime wants to show 1st and last 3 letters and in between some * than you can do it by sub-string and string concat method
QUESTION
Delphi 10.3.3
got here Android 10 (also Android 8). Battery Optimization is off . The problem only happens if my Device is on the charger. After approximately 48hrs it dies .
I tried to solve this by waking the device up periodically (after 8hrs) . Today it last sent data to the server at 3:00 , so I thought it is dead. But to my big surprise , it still woke up at 08:00 . Unfortunately after touching the screen , to try to open something . Android forced me to close the app.
Here is the part of the code :
(excuse me for the length, it looks to be long , but is is the bare minimum , I thought I'd include every procedure and function I use in order to perhaps help someone smarter then me see if I am leaking memory or doing something horrible, note : this very same code is NOT crashing or hanging after weeks if Device is not on the charger)
...ANSWER
Answered 2021-Mar-31 at 10:38IIRC on mobile devices there is no guarantee that the Android/iOS system will let an application live forever. It is very possible that your app is killed by the OS sending a SIG_ABRT
after a while, to release resources.
Another possibility is that there is an OOM after too many threads. The log error indicates that there is a problem creating a thread.
Perhaps each DB connection uses a thread, which is not released, so after a while, it crashes. Please remove the DB connection and try again. It may help isolate the root cause of your problem. Also try to log the memory consumption, to see if there is no leak for this long-standing app.
Anyway, I would rather use REST service over HTTPS+JSON for app communication, instead of the bloated DataSnap RAD client.
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