Algo Talk: Railroads from Facebook Hacker Cup

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  • Опубліковано 16 вер 2020
  • I'm again joined by David (@SecondThread) to discuss an interesting algorithmic problem. It's Railroad Renovations from Facebook Hacker Cup Round 3. Watch the other video we made, Robot Cleaning • Algo Talk with Erricht...
    Full statement: / b
    Subscribe for more educational videos on algorithms, coding interviews and competitive programming.
    - Watch my live streams on Twitch or my 2nd YT channel / errichto & / errichto2
    - Frequently Asked Questions: github.com/Errichto/youtube/w...

КОМЕНТАРІ • 45

  • @TheAlgorithmicEye
    @TheAlgorithmicEye 3 роки тому +51

    Errichto and SecondThread are on fire and the community is benefiting from their collabs

    • @achiver
      @achiver 3 роки тому

      Hello Errichto can you create some playlists for DS and algorithm because I followed you for two days and I love your way to explain.

  • @Decaynessvonjoey
    @Decaynessvonjoey 3 роки тому +44

    i do not under stand any of this videos in this channel i just love his face and his quickly typing

  • @fbru02
    @fbru02 3 роки тому +1

    Thank you guys for this video !

  • @akhilanand3708
    @akhilanand3708 3 роки тому +1

    please make more videos like this ..... it really helps a lot

  • @rupka5563
    @rupka5563 3 роки тому +6

    I just came here, and i have no idea what are they talking about 🤣

  • @javohirmirzo
    @javohirmirzo 3 роки тому +2

    I watched your other videos and noticed you used vim extensively and seem to know all the keyword combos to get the best use of it. Please do a small tutorial on how to use vim or nano

  • @niranjanshukla2002
    @niranjanshukla2002 3 роки тому

    Good Morning Sir,

    Sir, I want to say that can you make a video on selected topics :

    1.> complete d.p.

    2.> some important technique mostly used in coding interview/contest

    3.> the last one how to recognize the question that it is from binary search, D.P. or simple array.
    I hope you will to all kind of people like me !!!!!!!!!!!!!!!!!!!!

  • @sarthaksingh2175
    @sarthaksingh2175 3 роки тому

    Please make a couple of educational videos on DFS and BFS just like you have for dynamic programming.

  • @sohammukherjee8079
    @sohammukherjee8079 3 роки тому

    Are you actually using a mouse while drawing the stuff on the board? Cz it seems fairly neat and easy.
    Also, love this sort of two way discussion and th exchange of various ideas at different stages.

    • @gourabsinha
      @gourabsinha 3 роки тому +1

      He is using a digital pen bro.

  • @topievan190
    @topievan190 3 роки тому +1

    You are talented man, cooollll, keeppp ittt uppp 🥰👍🥰👍🥰🥰👌🙏😁👌

  • @hairyape_8103
    @hairyape_8103 3 роки тому

    These colabs are great

  • @arielsashcov99
    @arielsashcov99 3 роки тому +2

    What keyboard are you using Errichto?

  • @belaluddin6554
    @belaluddin6554 3 роки тому

    Good job!

  • @The.Jaynish
    @The.Jaynish 3 роки тому

    Hello dude can make a video on what changes have you made in geany....please
    Like how did you overcome the problem of underscore, how to make a template code every time.... like that make a video please

  • @zaabimahdi
    @zaabimahdi 3 роки тому +3

    @Errichto : please N Queen backtracking problem !

  • @mustbenikon480
    @mustbenikon480 3 роки тому

    Hi , bro
    Sorry for off topic , but I see that u r one of the most popular hackers in UA-cam. There’s a problem which is killing me and a lot of people around the world - input lag. Massive and huge input lag , have you ever faced with that theme?
    If u can help or explain what to do to get rid of it - create a video. Best wishes , bye!

  • @raghugore3990
    @raghugore3990 3 роки тому +1

    Can u please provide solution and explanation for the below :
    Write a program to find Largest 4 digits Prime Number whose Sum of Digits is also Prime.
    1.Prime Number is any number that is divisible only by 1 and itself. Examples are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31,........
    2.Sum of Digits means sum of all the digits in that number. Example is number is 1234 then the sum of digits is 1+2+3+4=10

  • @marveltv5341
    @marveltv5341 3 роки тому +1

    Hey I want to ask..
    If you are using one c++ template.
    And every other coders use the same template...
    Than in contest would it be considered to plagiarism...
    Coz almost 40% code is same as others (due to this template )

    • @KoepenickDrums
      @KoepenickDrums 3 роки тому

      I'm no expert but because time of submitting solution is measured it actually will be hard to cheat and if several people use the same algo template this is totally OK if you can see that the rest of the implementation is authentic

    • @marveltv5341
      @marveltv5341 3 роки тому

      @@KoepenickDrums but in lot of coding exams.. let it be codechef or Amazon..
      Lot of candidates face this plagiarism issue.. you may find in those issue in Google..
      There codes are correct still they unable to proceed further..
      This tool plagiarism detector.. has take down lot of candidates who use template..
      But for international level competition.. they are just fine..

    • @KoepenickDrums
      @KoepenickDrums 3 роки тому

      @@marveltv5341 That's why the fastest win :) or maybe problems should be original enough so you can't use existing templates, but I guess that's too much to ask for as there are a limited amount of algos

  • @akhilanand3708
    @akhilanand3708 3 роки тому +2

  • @mahadifamgate2686
    @mahadifamgate2686 3 роки тому +1

    anybody friends can help me out, i heard va panel monitor is much better for coding for having extremely srgb, text r much sharper, compare to same price ($230) ips panel monitor , what u think guys ? is it better asus vg249q for reading text sharp ? or which one will be better in this budget , i want monitor for reading so much pdf , and practicing c++ , java etc.

  • @albertsteve9551
    @albertsteve9551 3 роки тому

    How do you learn programming? What is the first step?

    • @amir3515
      @amir3515 3 роки тому

      learn how to print hello world

  • @vaibhaves
    @vaibhaves 3 роки тому

    Discord link pls, the one in the banner is invalid

  • @ddrci88
    @ddrci88 3 роки тому

    Yooo bro give me some tips for fb ads algorithm pixel 😂

  • @KoepenickDrums
    @KoepenickDrums 3 роки тому +1

    You're skipping some parts of the problem or the explanation was not coherent because there were some points where I lost track. Maybe it's good to read the initial problem before watching the video but I guess it'd be great if that wasn't necessary

  • @elatednothated
    @elatednothated 3 роки тому

    can u make .e a executor for a game called roblox

  • @Powssss
    @Powssss 3 роки тому

    siema jestes polakiem? :)

  • @arinroday302
    @arinroday302 3 роки тому +1

    Why wasn't SecondThread allowed to participate???

    • @amritm5806
      @amritm5806 3 роки тому +1

      As he said he was a tester to that question. Which means he knew that it was going to appear in the contest.

    • @shashanktiwari4442
      @shashanktiwari4442 3 роки тому +1

      Maybe he works for facebook?

    • @arinroday302
      @arinroday302 3 роки тому

      @@amritm5806 yupp,.got it :)

  • @pr4ct1cal
    @pr4ct1cal 3 роки тому

    Carl H 2.0?!

  • @naklecha
    @naklecha 3 роки тому +1

    Legend says Errichto considered pinning my comment.

  • @pratikjha3647
    @pratikjha3647 3 роки тому

    0th?

  • @olafsurgut8639
    @olafsurgut8639 3 роки тому

    second (thread)

  • @kaguratoramonline9089
    @kaguratoramonline9089 3 роки тому +1

    hi i was impressed woth ur intelligence and ur work... I would like to ask CAN U MAKE SOME MOD FOR A ONLINE GAME? LIKE " Toram Online" can u please answer 🙏🙏🙏

  • @sonido0
    @sonido0 3 роки тому

    william better than you bro

  • @AR-fp5xp
    @AR-fp5xp 3 роки тому

    I am sorry but these questions are all trivial mathematics and intro to algorithms type of material taught at any decent undergrad peogram. Why is this competition significant? Sorry. I don't understand the significance of this. Is it just for fun?