dardev's blog

CSES: Graph — Video Editorials
By dardev, 3 years ago, In English

Hi,

I am planning to post all solutions of CSES graph series; while also discussing the necessary theory involved.

Update: I reuploaded the first 12 videos with better audio quality. All audios are good now.

Here is the entire playlist: https://www.youtube.com/watch?v=oglZA8d6rRw&list=PL2S6Mj7iLqEjNVq0e-pZ9rSnpAacHzVm3

  1. Intro part 1: https://www.youtube.com/watch?v=oglZA8d6rRw

  2. Intro part 2: https://www.youtube.com/watch?v=5NOQmseaH6A

  3. CSES 1: Counting Rooms(1192): https://www.youtube.com/watch?v=WUqkIH1gHMM

  4. CSES 2: Labyrinth(1193): https://www.youtube.com/watch?v=s0DnJ0CdNEE

  5. CSES 3: Building Roads: https://www.youtube.com/watch?v=ZuahPX13NR4

  6. CSES 4: Message Route https://www.youtube.com/watch?v=TJolGL0G3O4

  7. CSES 5: Building Teams: https://www.youtube.com/watch?v=MDTq58KLIx0

  8. CSES 6: Round Trip: https://www.youtube.com/watch?v=qYyyj2SRsRc

  9. CSES 7: Monsters: https://www.youtube.com/watch?v=hB59dxdDLII

  10. Theory Time: Heaps Part 1 — Intro to Heaps, Trees, Rooting a Tree, Binary Tree, Complete Binary Tree https://www.youtube.com/watch?v=pc-m_251X6k

  11. Theory Time: Heaps Part 2 — Inserting, Retrieving, Heapfication into Heap https://www.youtube.com/watch?v=LzBJefIvZ80

  12. Theory Time: Heaps Part 3 — Flattening Heap into Vector. Navigating a Flattened Tree https://www.youtube.com/watch?v=HZYeAEaT5j0

  13. CSES 8: Shortest Routes I: https://www.youtube.com/watch?v=ditJWdFqoXk

  14. CSES 9: Shortest Routes II: https://www.youtube.com/watch?v=sdy6qXlB7g8

  15. CSES 10: High Score: https://www.youtube.com/watch?v=2Epc8xZObIc

  16. CSES 11: Flight Discount: https://www.youtube.com/watch?v=GZtZXhir7Wg

  17. CSES 12: Cycle Finding: https://www.youtube.com/watch?v=kZfm68XKC58

  18. CSES 13: Flight Routes: https://www.youtube.com/watch?v=009PBKHXtyA

  19. CSES 14: Round Trip II: https://www.youtube.com/watch?v=kzeAHV2Pw2o

  20. CSES 15: Course Schedule: https://www.youtube.com/watch?v=NLgYD6oFK2E

  21. CSES 16: Longest Flight Route: https://youtu.be/9HMawd5jn9A

  22. CSES 17: Game Routes: https://youtu.be/g_1qUIlpuzg

  23. CSES 18: Investigation: https://youtu.be/Obwl9U6i-6o

  24. CSES 19: Planet Queries I:

  25. Theory Time: Least Common Ancestor by Binary Lifting (More LCA techniques will be covered as we cover more techniques in this series)

  26. CSES 20: Planet Queries II

  • Vote: I like it
  • +65
  • Vote: I do not like it

Comments Comments (13)
| Write comment?
»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

thanks for contributing, keep it up :)

→ Reply
  • »
    »
    3 years ago, # ^ |
      Vote: I like it +5 Vote: I do not like it

    Thank you very much bro

    → Reply
    • »
      »
      »
      21 month(s) ago, # ^ |
      ← Rev. 2   Vote: I like it -13 Vote: I do not like it

      lol you both are same xD , any guys can see the videos of kartik8800 and this guy video , both voice is exactly same kartik arora youtube channel dardev youtube channel

      → Reply
      • »
        »
        »
        »
        21 month(s) ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        I would have been really happy if my channel also offered a dedicated learning for graph algorithms/problems. Why would I post them on a seperate Channel with a seperate name haha

        P.S. Consider investing in a good pair of headphones xD

        → Reply
»
3 years ago, # |
  Vote: I like it 0 Vote: I do not like it

https://ideone.com/B3AsVh can anyone check what is wrong with my solution to monsters.

→ Reply
  • »
    »
    3 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    https://ideone.com/sRtFZ3 this is the final solution some are passing some are not please help me

    → Reply
    • »
      »
      »
      3 years ago, # ^ |
      ← Rev. 3   Vote: I like it 0 Vote: I do not like it

      Did you watch the video? I didnt go through your whole code; but are you using multisource BFS?

      I actually demonstrated why single source BFS won't work; by submitting bad code first.

      https://www.youtube.com/watch?v=Hbi8HbAhNXg

      → Reply
      • »
        »
        »
        »
        3 years ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        Yes I went through your video and yes I used a multisource bfs.

        → Reply
        • »
          »
          »
          »
          »
          3 years ago, # ^ |
          ← Rev. 2   Vote: I like it 0 Vote: I do not like it

          I tried to skim through your code: Here is what I understood:

          You are performing BFS on Player; You are retrieving the FIRST monster; You are propagating this FIRST monster?? (What about the other monsters?) Then you are retrieving FIRST possible position of player. You are BFS propagating it.

          → Reply
          • »
            »
            »
            »
            »
            »
            3 years ago, # ^ |
            ← Rev. 3   Vote: I like it 0 Vote: I do not like it

            oh sorry now I forgot to add the loop :) but my idea was same as your lava example

            → Reply
            • »
              »
              »
              »
              »
              »
              »
              3 years ago, # ^ |
              ← Rev. 2   Vote: I like it +1 Vote: I do not like it

              Okay. Now secure go ahead and secure that AC.

              → Reply
»
2 years ago, # |
  Vote: I like it 0 Vote: I do not like it

Really good for newbies to Graph

→ Reply
»
9 months ago, # |
  Vote: I like it 0 Vote: I do not like it

thanks!It's really helpful!

→ Reply