BFS vs DFS, and Timing of Marking Vertex as Visited

The Wikipedia article on Depth-Frist Search states that:

The non-recursive implementation is similar to breadth-first search but differs from it in two ways:

  • it uses a stack instead of a queue, and
  • it delays checking whether a vertex has been discovered until the vertex is popped from the stack rather than making this check before adding the vertex.

(emphasis mine)

Conversely, the article on Breadth-First Search states that:

This non-recursive implementation is similar to the non-recursive implementation of depth-first search, but differs from it in two ways:

  • it uses a queue (First In First Out) instead of a stack and
  • it checks whether a vertex has been discovered before enqueueing the vertex rather than delaying this check until the vertex is dequeued from the queue.

My two questions are:

  • Why is this important (i.e., why does each algorithm need to do it in a different way), and
  • Why does it specifically apply to the non-recursive implementation?

Getting the URL of second last visited page in SharePoint

I am able to get the previous page URL, but also I need to get the URL of the second last visited page.

I have used the below code..

<script> _spBodyOnLoadFunctionNames.push("GetUrl");    function GetUrl() {    var referrer =  document.referrer; alert(referrer);  //var x=history.go(-2); //alert(x); } </script> 

but history.go(-2) will directly redirect to the second last visited page, how to get that url?

Promote your Website 10 quora answers with highly visited Quora profile for $5

Why you promote your website to Quora? Quora is really an exceptional and dynamic request answer page, that can give both traffic and puzzling backlinks to your site. Quora answers give you high DA PA backlinks. Now I will say to you why you pick my service. My answer is interesting from others and I write it myself.perfect length for reading. So that no one doesn’t feel boring.100% of real traffic. Each and every answer is submitted with and just manual advance.Be straightforward when I post content.Professional service for a specific niche. NOTE: Feel free to ask me any question. And if you don’t satisfied with my work please you can say then I guarantee a 100% refund. Now you can order with confidence!

by: SEO954Alex
Created: —
Category: Question/Answer
Viewed: 202


What % of unique users visited a page (1 or more times)?

I have a chat feature on my site, which some of my users LOVE, and some don’t use at all. I’d like to know how many of my users visited the chat page (% of total unique users, I guess).

For example: if I had 10 users on my site last month and 3 of them each visited chat 10 times, while 7 of them never went to chat at all, I want to know that 3 people used the chat page (not that that the /chat page had 30 entries).

How can I get that?

Can a site with HTTPS be impersonated if it’s visited for the first time?

From https://doesmysiteneedhttps.com/:

“Attackers can still impersonate my site, even if I use HTTPS.”

They can try, but as long as your private key stays private, browsers will show warnings if attackers present a mismatched or invalid TLS certificate. And if the attacker does not use HTTPS at all, browsers should mark the imposter page as insecure. To this end, HTTPS guarantees authenticity.

But what if the site is visited for the first time? Wouldn’t the certificate be downloaded for the first time so the fake one will be seen as the legitimate one by the browser?

How to write International Movements in Australia Graduate Visa if I visited Schengen area?

I’m applying for a graduate visa (subclass 485) in Australia. I’m currently stuck on:

Part E: International Travel / Movements

Have you travelled to any country other than Australia in the last 10 years?

I traveled to Europe last year with a tour. I got a Schengen visa. How should I write that in the form?

  1. Should I write every country that I visited in Europe?

  2. or should I just write Europe?

And how do I extend the form? Currently the form has only 5 rows. But I’ve traveled to other countries more than 5 times in the past 10 years.

How to write International Movements in Australia Graduate Visa if I visited Schengen area?

I’m applying for a graduate visa (subclass 485) in Australia. I’m currently stuck on:

Part E: International Travel / Movements

Have you travelled to any country other than Australia in the last 10 years?

I traveled to Europe last year with a tour. I got a Schengen visa. How should I write that in the form?

  1. Should I write every country that I visited in Europe?

  2. or should I just write Europe?

And how do I extend the form? Currently the form has only 5 rows. But I’ve traveled to other countries more than 5 times in the past 10 years.

Woni Spotts visited every country, continent, and many territories making her the first black person to do so. Jessica Nabongo

Why is Jessica Nabongo raising funds claiming she will be the first? Why are some bloggers, tourists boards, and media helping her deceive donators after knowing about Woni Spotts?

Woni Spotts http://www.blackhistory.org/2019/05/wonnie-spotts-first-black-woman-travel-every-country-continent.html

Jessica Nabongo https://www.complaintsboard.com/gofundmecom-thecatchmeifyoucancom-jessica-nabongo/donations-scam-c1126164