csp2020 fish catching

Preface

In view of the successful jump to 250 grades after the second year of high school, my whole focus has moved to cultural classes.
Then informatics unfortunately left a lot.
On weekdays, there is violence in the game on Saturdays, and there are very few relevant topics.
Then my classmates stopped cultural classes for one week, and I came to one class every night.
When I came here, I also looked at some strange questions, but didn't try to solve them.

In general, it can be said that I haven't devoted myself as much as before for a whole month, and I often start cultural homework just after class and start fishing.
In this month’s isolation, I felt that the code speed, thinking, and code logic of the whole person were not as good as before. It was very strange. But if you want to say something good, that is, the mentality is still relatively peaceful.

Let’s talk about the process.

Day 0

After repairing it late, I ran to the computer room to continue watching the game played by my classmates that day. I feel that the questions are all gods, only violence. I was thinking about splitting two questions and adding two more violent questions, but when I thought that I was so good, I changed my strategy, cut 1 question, and used all the violence in the last three questions, maybe I could get 300 points.

With his back to back to the patted board, Kang tarjan, kmp pushed on the spot. The others are ignored.
Then Kang Kang's car rollover record last year, I feel that the past is unbearable. Looking at the previous self, I felt really strong, maybe it was also the overconfidence that caused the crazy explosion.
Anyway, remind yourself to treat it with a normal heart, and remind yourself repeatedly that it is so beautiful to sleep at night.

Day 1

The game was in the afternoon. I listened to the physics class that morning and felt like I didn't learn anything.
Then come to the computer room to fish casually, and listen to the gold medalists sharing their life experiences.

Have lunch, take a nap (really comfortable), and walk to the computer room when I get up at 2 o'clock.
It is said that the home test really has an inexplicable advantage, and it is not nervous at all.

I have to say that the Jizhong test center is really full of people, and many people
wash their faces before the test and formally enter the state.

2:23

I became bored, staring at the screen time above and my computer time, and found that there was a difference of 21 seconds.

2:30

Enter the password, it seems to be "you can tap jade". The last sentence of the examination room invigilator also added "the stone of other mountains"

It means: using stones from other mountains, you can use them to polish jade artifacts. Encourage you to use external forces (many friends) to improve your knowledge and correct your mistakes.

Before the exam, I guessed what "Come on Trump" or something

Open T1, eh, isn't this the 10 days that disappeared in history? I forget where I got it when I was young. And how does this question resemble a certain question in the noip popularization group of a certain year? I ended up with that question because I typed "data". I hope this question will not be flagged and
open T2. ​​What kind of fairy stuff, it feels strange.
Open T3, ok, I didn’t understand
Open T4, ok, no idea

2:50

OK, just open the code T1, drew a little bit, and played in three stages. It took almost 40 minutes to finish typing the Julian calendar. Eating a chocolate is shocking.
At least there is a mark, and a copy will quickly (40 minutes) get a Gregorian calendar.
At a glance, eh, 4:10 points. A little flustered. It feels incomparable to measure big data. At this time, I remembered that there is pascal? Then I made a judgment and found it. After thinking about it, I felt that violence is more difficult to deal with than a correct solution, so I tested a few more boundary data and threw it away.

4:30

Turning on T2, I don’t feel it, it seems to require high precision. Then look at the range of violence data.
Have a look, eh? Isn’t it gone if you open an unsigned long long?
I was so scared that I went back and looked at the question again. Confirmed it was a water problem.
This kind of water question should be placed in T1

Random code, a special sentence $2^{64}$ , after a large sample, throw it away.

5:00

I still feel confused when I open T3. I don't know the peculiar nature of the tree, so just let it go.
When I opened T4, I thought of a false greed at first, and it seemed to be able to pass 55.
Anyway, it is similar to not eating if the current order reaches the end.

Full code speed. Stupidly, I also opened a segment tree. After I finished the test, I found something wrong. I suddenly thought that the second child might not want to eat the boss after eating, because the second child might die after eating.
Calm down and go to the toilet. Finding it in the toilet seems to be a pirate sharing problem. Then do the reverse and record the answer after the snake has eaten it.
It seems to be gone, code code code. After the big sample, throw it!

6:00

Woj, I found 6 o'clock after playing T4. T3 has no brain on simple violence and strange pruning. Looking at the data, it seems that it can exceed 20 points.
Well, no loss, there are 15 minutes left.

6:15

Started frantically to check the header files, build folders, and checker.

6:23

With 7 minutes left, I looked for Minesweeper and seemed to be unable to find it. The process of typing "goodbye world!" with pascal is almost over.

6:30

finish exam.
Come out to discuss, everyone T1 seems to be confused. T2 AC per capita. T3 turned out to be a sb extension question, and I feel that it is quite routine to do too much. The 597 of T4 was almost cut off, almost AK.
%%%
feels like it has taken a popular score, and it feels normal for a fish fisher like me.
Estimated points 100+100+20+55=275

Day n

I heard that the program has been issued. Then come to Kangkangluo Valley.
Good guy, I heard that a lot of people hang T1 to 40 before the test, but I ended up too.
T2 forgets the netherworld stuff with n=0. T320 points are normal, and T4 results hang to 25. QWQ.
It's about 90 points.

T1 is still the underworld score, T2 has not changed, T3 has given me 20 points, T4 has not changed.
It depends on whether T1 will conscientiously release some water data when CCF comes (although not much expectation).

Question summary

problem

T1

Later, after playing with the wrong data, I found that for some strange data points, I calculated the year, month, and day, and the result was not output. QWQ

——From Zhihu

T2

It should be the n=0 netherworld stuff.

T3

Improper time allocation, a routine water problem only took 15 minutes to think about, and took the lowest level of violence. I felt that I shouldn't be mad at T4 stupidly.

T4

My funny line segment tree seems to be a little messy.

answer

T1

Violent strong simulation

T2

You can do it after reading the question. Pay attention to the boundary and unsigned long long and it will disappear.

T3

If it is found that it is a directed graph, and the contributions can be merged, just run the topology.

T4

Actually almost thought of it. Similar to the greedy strategy of the pirate's gold sharing problem, each snake will stop here if it will be eaten later. Use the queue to record the number.

to sum up

There are still many loopholes in csp this time. For example, the code speed, accuracy rate, etc. have dropped a lot, for example, if the problem is not solved for too long. And there are still some small details that I didn't pay much attention to during the game. The overall strategy is relatively stable, but still not able to fully grasp the time perfectly.
We still need to practice more, and we still need to strengthen our usual training. Of course, we need to balance the culture class.

This score feels that it should be no problem to enter the noip to fish.

——From Zhihu