Topcoder SRM 733 is scheduled to start at 12:00 UTC -4, April 14, 2018.

Featured Problem Writer: ltdtl Update: Match Editorials: https://www.topcoder.com/blog/single-round-match-733-editorials/

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Why don't you tell the problem setter of this match?

Featured Problem Writer: ltdtl

Auto comment: topic has been updated by hmehta (previous revision, new revision, compare).Reminder: The match begins in 3 hours

Thanks for Participating! Here are the Match Editorials https://www.topcoder.com/blog/single-round-match-733-editorials/

1000 div1: google [hamiltonian cycle in a tournament graph], or just go directly to [Wikipedia](https://en.wikipedia.org/wiki/Tournament_(graph_theory)).

It's not nice giving problems like "implement something written in the internet" for an online contest... (and yes, I didn't manage to implement it correctly — but this is a different question, problems should be about ideas, not about googling and implementing).

I don't see algorithm about Hamiltonian cycle on wikipedia.

It says "build a path, then construct a cycle in a similar manner". It indeed works like this, but not entirely obvious — so either download the paper from the wikipedia references, or (easier) just google and find the exact algorithm, for example.

Well, it's not same enough. For path you can always add one vertex, in cycle sometimes you need two add two at a time. Here is article in russian :)

Proof of the fact it always exists (if tournament if strongly connected) is constructive. It can be as is converted to O(N^3) algorithm, and quite easy to O(N^2) or O(N^3/32).

How to do it in

O(n^{2})?Count a lot of numbers of edges between different sets to find good vertex to add in O(n) time. You can check details in my submission.

Reminded me of this problem!

This author had the last round too, solutions to div1 medium and hard were found in a book and div1 medium was googlable directly. I'm not very surprised.

Wait a minute, is he really from DPRK? Oo

div1 500: google [number of ways to add edges tree] -> first link gives the exact formula https://math.stackexchange.com/questions/640205/numbers-of-ways-k-1-edges-to-be-added-to-k-connected-components-to-make-th

Wtf? Even in editorial it is mentioned that this is a classic problem and another example of CF problem is provided...

I just simply didn't expect such a shit so I didn't even think about googling...

Are testers (lewin and dreamoon) noticed about it?

Feels bad when the last time me passing the system test is like a year ago lol(and it was in div2).

Video solution for Div2 P1 MinimizeAbsoluteDifferenceDiv2: https://youtu.be/ApEOvRWdZ7I

Video solution for Div2 P2 BuildingSpanningTreesDiv2: https://youtu.be/SXhYlF2sdUk

Video solution for Div2 P3 HamiltonianPathsInGraph: https://youtu.be/_eD3HE4piYs

Div1 250 editorial solution doesn't even pass systest due to precision errors

Fixed!

Thanks :)