### culver0412's blog

By culver0412, 2 months ago,

Thanks for participating, and happy Easter!

Editorial
Implementation
Remark

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Question

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Hint 2
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### 1815B - Sum Graph

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Harder version
Solution to harder version

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Observation 1
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### 1815F - OH NO1 (-2-3-4)

Key Idea 1
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Implementation (Tester: gamegame)
• +130

By culver0412, 2 months ago,

Happy Easter, Codeforces! Sadly the round will not be Easter themed :(

We (arvindf232, culver0412, dbsic211, happy.potato, jerryliuhkg) are delighted to invite you to participate in Codeforces Round 865 (Div. 1) and Codeforces Round 865 (Div. 2), which will take place on Apr/09/2023 17:45 (Moscow time). Participants with a rating lower than 1900 will participate in Division 2, while participants with a rating of at least 1900 will participate in Division 1. Notice the unusual starting time.

All the problems were authored and prepared by arvindf232, culver0412, dbsic211 and happy.potato. Huge thanks to the following people, without whom the round would not be possible:

In both divisions, you will have 2 hours and 15 minutes to solve 6 problems. One of the problems is interactive, please see the guide of interactive problems if you are not familiar with it.

Wish you good luck and high ratings!

UPD1: Score distribution is as follows:

• Div. 1: 500-1250-1750-2500-3000-3500
• Div. 2: 500-1000-1250-2000-2500-3250

UPD2: Editorial

UPD3: Congratulations to the winners!

Winners
First solves
• +408

By culver0412, history, 2 months ago,

I was randomly doing some searching on the search bar on CF, and a very strange thing happened

Obviously, there should be results of "April fools" on CF. I have tested that, if I change to sort by popularity or time, it also does not show results. I also tried other things to search, and the only thing it shows is a person of the username I searched, such as follows:

I also reproduced it on my phone, so it should not be a problem on my end (unless it is that both my computer and my phone has a problem) Can MikeMirzayanov have a look on it?

• +7

By culver0412, history, 9 months ago,

I am a purple coder, who desperately want to get to orange in order to write a CF round. Sadly, despite my attempts, I still haven’t succeeded.

During summer, or if the next day does not have school, I can stay up late (my time zone is GMT+8) and participate in the round. But as I become increasingly desperate, I want to find a way to participate Round 821 also, which is on a Monday, and not get sleep deprived for the next day at school. The more rounds I participate, (hopefully) the quicker I can become orange.

Now, I want some suggestions for me to be able to participate a CF round and still be able to wake up early for the next day of school and not doze off during lessons. Can anyone give any suggestions?

• -2