Two days test three games to try, again and again a normal countdown middle.
But that did not stop my determination to become a piece of hand QwQ
The first exam, violence played.
The second test, three very little violence, played rank15.
Third exam, seven very little violence, played rank19.
But relatively water T1, A lot of people out.
Stability is not enough, or that is not strong enough.
For details
I detail has been a very serious point drop points.
Details of the problem, or that not strict enough.
Simply copy does not change the amount of variable names wrong, greater than less than number.
It seems silly mistakes, but just as likely to be my final defeat potential enemies.
Urge caution.
There is now a very serious problem.
I have no correct answer some ideas.
Or that there are signs of positive solutions but can not continue to think down.
Or close to, but with a positive solution can not really write about.
In other words, now only fight violence, and even violence are playing dissatisfaction.
For chestnuts, an examination of the thought process of T2:
In general this matrix Unicom will need to build a map of it.
emmm, only a simple path, that is, without the ring?
Seeking Unicom block ah, or record it to judge the direction of China Unicom. . .
This idea did not feel ah, bfs certainly not.
Ah so hard to write it first hit of violence.
But what if the conversion, there is no ring is a tree, Unicom block is the forest.
The question then becomes the number of requirements of a given matrix of forest,
So the number of forest == points - the number of edges, then cut.
Another example, that is, I only played 10 minutes T1:
Where else about this record after each reversal point turn right.
difference? No array is too big, not to mention how differential ah.
Simply record what, this is definitely going to die ah.
It seems only related to each reversal point, ah, record it?
Or not, the array can not open.
Then we hit a dead violence.
But along the original ideas, and just about every reversal point, then you can maintain the turning points ah.
N $ $ $ 10 to $ ^ {18}, but only $ M $ 3000, can significantly $ M ^ 2 $ ah, and then cut.
emmmm, very dangerous, very dangerous.
Thinking, it is a very important part of OI, said to be the basis of all the algorithm is not excessive.
And it is this I'm missing the most important foundation.
Thinking too rigid, there is no way to convert flexible, very scary.
You need to exercise, but I do not know how to do it.
After only think more practice on it.
So what I say so straight Lrefrain deserve WA0? ? ?