Create spoj-cot.mdx (solution for the problem I added about persisten… #5073

1Nigar357 · 2025-01-22T22:36:44Z

…t segment tree)

The code solution for the problem count on tree from spoj on persistent segment tree concept

Place an "x" in the corresponding checkbox if it is done or does not apply to this pull request.

I have tested my code.
I have added my solution according to the steps here.
I have followed the code conventions mentioned here.
- I understand that if it is clear that I have not attempted to follow these conventions, my PR will be closed.
- If changes are requested, I will re-request a review after addressing them.
I have linked this PR to any issues that it closes.

…t segment tree) The code solution for the problem count on tree from spoj on persistent segment tree concept

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1Nigar357 · 2025-01-22T22:44:22Z

Hi, I just submitted this pull request. Please let me know if there’s anything I need to adjust or address. Thanks!

1Nigar357 · 2025-01-22T23:12:24Z

Could you please help me resolve the problem "Some checks were not successful"? Is the " '''cpp " causing the problem?

TheGamingMousse · 2025-01-22T23:51:51Z

fyi, you can test ur mdx code at usaco.guide/editor

TheGamingMousse · 2025-01-23T00:08:55Z

hmm, it's giving this error:

Internal solution spoj-cot isn't linked to all of its problems (see above). Did you forget to update the solution metadata of a module after adding an internal solution?

  Error:Internal solution spoj-cot isn't linked to all of its problems (see abo  ve). Did you forget to update the solution metadata of a module after adding a  n internal solution?
  
  - gatsby-node.js:1 
    /home/runner/work/usaco-guide/usaco-guide/.cache/compiled/gatsby-node.js:1:8    567
  
  - Array.forEach
  
  - gatsby-node.js:1 Object.n.createPages
    /home/runner/work/usaco-guide/usaco-guide/.cache/compiled/gatsby-node.js:1:7    973
  
  - task_queues:95 processTicksAndRejections
    node:internal/process/task_queues:95:5
  
  - api-runner-node.js:[48](https://github.com/cpinitiative/usaco-guide/actions/runs/12919237231/job/36029331675?pr=5073#step:7:49)7 runAPI
    [usaco-guide]/[gatsby]/src/utils/api-runner-node.js:487:16
  

not finished Running gatsby-plugin-sharp.IMAGE_PROCESSING jobs - 13.133s
failed createPages - 0.814s

1Nigar357 · 2025-01-23T00:10:10Z

I changed the solution metadata kind to internal after committing this change. I think I accidentally included it in a different pull request

TheGamingMousse · 2025-01-23T00:11:44Z

I changed the solution metadata kind to internal after committing this change. I think I accidentally included it in a different pull request

yeah thats what it looks like, just change the solution type to internal

…data of the problem called count on tree)

1Nigar357 · 2025-01-23T00:16:21Z

I think I solved it

TheGamingMousse

just some misc style changes + other

for examples of how the code should roughly look, u can look at other internal solutions (here's a good example)

solutions/advanced/spoj-cot.mdx

Co-authored-by: Justin Ji <[email protected]>

1Nigar357 · 2025-01-23T00:43:48Z

Thank you for the suggestions! Is there anything else that you would suggest modifying?

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solutions/advanced/spoj-cot.mdx

…code) Modified the explanation part and organized the code

1Nigar357 · 2025-01-23T18:40:30Z

I changed the code and the explanation part

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solutions/advanced/spoj-cot.mdx

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solutions/advanced/spoj-cot.mdx

Corrected explanation, specifically the "handling overcounting with LCA" part

Changed the variable name from a to u and b to v

Modified the note, so it is more grammatically correct

corrected typo

1Nigar357 · 2025-01-29T18:10:31Z

Is there anything else that you suggest I modify? @SansPapyrus683

SansPapyrus683 · 2025-01-29T18:33:55Z

solutions/advanced/spoj-cot.mdx

+We subtract the frequencies of nodes from the root node to the LCA and its parent because we count the nodes twice from the root node to the LCA. In addition, since the LCA is on the path of u to v, we subtract the frequencies from the LCA and the parent of the LCA to consider the value of the LCA.
+
+$$
+\texttt leftCountFromUToV = leftCount[u]+leftCount[v]−leftCount[LCA]−leftCount[parentOfLCA]


uh this isn't what i meant by texttt lmao
i meant like wrap all the variable names with texttt (including lca)

I changed it

Also do I wrap the variable u and v too?

SansPapyrus683 · 2025-01-29T18:34:13Z

solutions/advanced/spoj-cot.mdx

+**Note:**
+Value compression is used to effectively handle large numbers, which could otherwise cause problems with indexing.


wrap in an tag or something, you can find examples by ctrl-f ing the reop

Can I use Spoiler tag and give it a title note
or can I use $ \ textb f { } $
@SansPapyrus683

TheGamingMousse

fyi, value compression isn't strictly needed (altho it makes it faster, ig)

my code is here (u can remove fast io, altho using std::endl times out cuz its slow)

solutions/advanced/spoj-cot.mdx

Deleted long longs and the build function since they weren't necessary

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TheGamingMousse · 2025-02-01T16:44:17Z

solutions/advanced/spoj-cot.mdx

+		compr.push_back(val[i]);
+	}
+
+	sort(compr.begin(), compr.end());


im curious, is there a specific reason ur code coordinate compresses? ig it is faster, but it isn't needed for this problem

as a side note, you definitely do not need 7e6 nodes. 5e6 sufficed for me, and my range was from 0 to INT_MAX

Yes, you are right. To avoid segmentation fault I set the number of nodes to 7e6. I changed the number of nodes to 5e6.

I used coordinate compression because the segment tree is a frequency tree and the constraint of the values isn't given in the problem statement. I used this method to ensure that there won't be a problem when building the segment tree. It also speeds up the program

I wrote the coed without the compression and it exceeded the time limit.

idk my code was perfectly fine without coord compression lol, but ig its fine the way it is

(also, i think maybe even 2e6 or 3e6 would work because ur coord compressing)

Yes, 2e6 works

I decreased the number of nodes since 5e6 would suffice

Reduced the number of nodes to 2e6

1Nigar357 · 2025-02-03T19:38:14Z

Is there anything else that you suggest I modify?

Create spoj-cot.mdx (solution for the problem I added about persisten…

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…t segment tree) The code solution for the problem count on tree from spoj on persistent segment tree concept

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…data of the problem called count on tree)

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Corrected explanation, specifically the "handling overcounting with LCA" part

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Changed the variable name from a to u and b to v

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Modified the note, so it is more grammatically correct

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Create spoj-cot.mdx (solution for the problem I added about persisten… #5073

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1Nigar357 commented Feb 3, 2025

		Note:
		Value compression is used to effectively handle large numbers, which could otherwise cause problems with indexing.

Create spoj-cot.mdx (solution for the problem I added about persisten… #5073

Are you sure you want to change the base?

Create spoj-cot.mdx (solution for the problem I added about persisten… #5073

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