It would be helpful if the first few test cases always contained edgecases/ tricky ones. That way we can upsolve a problem without looking at tutorial or other's solution. Consider this submission. I have no idea what went wrong. I even can't debug it because I don't know the case.

Sorry my bad.

In problem Div2 D the point calculation says -> 2000*(1 - 40 / 250) = 1680 Where 40 is the time of solve and 2000 is max point. So what happens if he solve a problem at 0 min from the start of contest? This case is valid as it is used in test case 3.

Thanks in advance.

Why the editorial is not appearing in contest page or announcement page? Please add link.

Yea. Sorry. That was my mistake.

But some accepted solution give output

2
2 3

Its wrong I guess!

For problem D what should be the answer for below case? I guess its not possible to choose a subset! Thanks in advance.

2
1 4 5
5 4 1

Thank you. got AC :)

Hello, for problem D your algo gives wrong output for following input(at least my implementation did :( )

5 2 2
1 4
1 2
2 3
3 4
3 5

the output should be 1 2. But mine give 1 3. (thus leaving node 5 3 miles away!)

The problem is, If we traverse those cities with police stations as given in input city 3 is marked visited by city 1. And when city 4 comes to city 3 it finds it already visited and cut the road(This will leave city 5). How can i fix it?

If someone is interested in source code it can be found 26301147

Because the given graph is a tree and a tree can not contain any cycle. And you can only hack the neighbors of a already hacked bank.(except first one). Hope it helps

System test data for Div-2 problem A are weak. They should test some hack cases too.

looks like Xellos is yellow.. No troll Xellos?

No I can still access.

Can anyone tell me why my code gives me (and everywhere I checked ) right answer but gives wrong on system test? my solution: 13269100

Please add tutorial link in Dashboard and problem page.

I used same as you and got AC!! seems like there's other problem.

**edit: I was wrong!

most people missed the '9' case because it was hard to calculate out :(

anyway problem set was great

Why judging is too slow?