Just don't miss it

BTW it's the last chance to advance to next Stage & this is the last TCO round for me this year :)

See what time it starts in your area

http://www.timeanddate.com/worldclock/fixedtime.html?msg=TCO14+Algorithm+Round+2C&iso=20140705T12&p1=98

Let us discuss problems here after the contest.

GL & HF

Is everyone allowed to take part, i am new to topcoder and i have not taken part in any of the previous TCO matches, am i allowed to take part in this one?

This one is only for those who advanced from Round 1. If you want to take part in topcoder contests, check out Single Round Matches (SRM).

I have taken part in 2srms before but not in any TCO'14 match , thats why i just wanted to find out if i was eligible for this one or not, btw thnx for your help :)

if you haven't taken part (and advanced) in TCO 2014 Algorithm

Round 1, then (sorry for the bad news) u are not eligible to take part inRound 2.Maybe I can write out of competition?

if u have advanced from

Round 1, and also advanced in one of the rounds2Aor2B, then u can participate in theParallel Round 2C.Oka~y, WTF is going on. And this isn't a question, because WTF is definitely going on. I don't know how about others, but the final results don't show me any systest AC, just pending scores...

what's more, my rating got updated and I can't log in to the Arena. What's next, aliens climbing out of my monitor?

when i enter my Username and Password into arena, it waits around 30 seconds and then says "Request timed out".

anybody else facing similar problems?

Yes, me too, this happened since 30 minutes ago :) BTW, any chance to get the T-shirt if my rank is 23X ?

No chance for T-shirt, sorry! There are 350 T-shirts, first 50 places were different in all 3 contests, so that leaves 200 T-shirts for places 51 and lower. Saying that 23X's place gets a T-shirt is like saying that 18X out of these 200 people were placed in top 23X in all 3 contests. Or something like that.

My guess is you have to be in the top 140-190 to get a T-shirt. Really depends on the diversity of the results.

Thank HellKitsune :)

I think that you have no chances for T-shirt:( Take a look at last year's winners.

BTW, has someone made same list for this year?

what is the criteria to get a t-shirt?

~~best score~~best position of all 3 rounds (whichever participated) of each participant is taken, andtop 350of these get a t-shirt. am i correct?Yes, you are) Only results with score >0 are taken into account (but usually it do not affect list of winners).

Rules, scroll down for part about t-shirts.It's to be expected that the arena system's disabled and TC techs are working on it.

Well, they notified that there were problems with system testing. Most likely they shut down the arena to investigate.

How to solve 500pt problem?

It's BFS, you just take all edges of a clique at once. Notice that when your BFS visits the second vertex of some clique, you can ignore all edges from that vertex in that clique, since the distances of all vertices that belong to it can't decrease anymore even if you tried these edges. That means you can do a BFS where you mark all cliques, of which you already visited a vertex (there are at most 2500 of them), and for each vertex, check all cliques and only try edges from that vertex that belong to cliques visited for the first time.

So, basically, on each BFS step we process the current vertex

vand:vlies.Yes, that was the best way to code it.

The complexity of that is O(N^3), right?

No, it's

O(NV+N^{2}), whereVis... well, size of the arrayV. Suppose we're doing a BFS from some vertex. Notice that we only check each clique as many times as it's mentioned among all vertices to which it belongs, and there are justVsuch vertices in total; similarly, we'll only try to go to each element ofVonce. That means a BFS only triesO(V) "edges", so it takesO(N+V) time, and all BFS together takeO(N(N+V)) time.(Ignore, same idea was already posted but I missed it when initially reading the thread. Sorry!)

You should add one vertex per clique and match original vertices with corresponding "clique vertices" only. So, in this graph all the distances are exactly 2 times bigger than in original one. But the edges number is linear and you can call BFS from each original vertex.

UPD: Another answer has appeared while typing :)

What about 3th problem? How to solve this? :-)

If you searched TC forums, you'd find a link to this.