nchn27's blog

By nchn27, history, 3 weeks ago, In English,

You are given a DAG with N nodes and Q queries asking if node b can be reached from node a. Can this problem be solved for the likes of N = 10^5 and Q = 10^5?

Also I think if we are given a general directed graph, the problem can be turned into one on a DAG if we do SCC's?

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By nchn27, history, 7 weeks ago, In English,

A common team-building activity goes like this:

There are N people, each holding hands with two other distinct random people.

How many expected cycles are there? Is there a name for this problem? Can anybody link related math or computer science resources?

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By nchn27, history, 2 months ago, In English,

William Lin has reached the front page, and people talking about William Lin have reached the front page. From any perspective, this man is clearly a charismatic yet powerful figure that deserves the respect he gets.

Tonight we (probably) find out if our favorite Taiwanese-American who has no alts on CodeForces will represent the country that took him into their arms when Taiwan did not.

Tmw, you are an inspiring programmer who has jumped over all the hurdles, demonstrated amazing programming prowess, and made it far in America's team selection process. Good luck to you, tmw!

EDIT: Today, May 30th 2019, at 9:00 pm EST, it was announced that William Lin (aka Tzuyu Chou) would represent the USA IOI team. Congratulations to our favorite K-pop indulger!

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By nchn27, history, 6 months ago, In English,

Recently, a blog with the same title as my blog right here was taken down.

^^^ EDIT: The blog is back up. This is no longer a dead link VVV

Dead link: https://codeforces.com/blog/entry/22616

For the people looking up "Codeforces Segment Tree Problems" on Google, here is an archived version of the webpage, before it was taken down:

https://web.archive.org/web/20180430005706/http://codeforces.com/blog/entry/22616

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