Conclusion of acm-icpc Xi'an Division

I never expected to win the iron. I used to think that the stem of coffee latte was very funny. Then one day I drank the cup of coffee myself, and I found my heart was really stuck.

I have expected the questions of Fudan University. The three questions of Fudan University in the year before have been raised from Golden district to copper district, but since last year's Nanjing division, the style of mathematics is not so prevalent. The topic can also be easily answered. The Nanjing division last year was due to insufficient knowledge points, there is no way to get the silver because of the outline DP or the decision tree. This year, I thought that the style of Fudan's question should have changed. It should be okay for our team to bring their knowledge together. However, the question is stuck in the end.

The experience of the on-site competition was like this. At the very beginning, I was responsible for losing the password and setting all the environments I needed. At this time, I checked the list and found that someone had passed question, then ZB began to read a for a long time. After reading it, it soon knocked it out and then 1A. Then WJ told me that he had an idea about question F and then gave me a formula to ask if I could do it, as soon as I read the data scale of this set of data, then I thought it was feasible to do so, and then I began to think about K. Then, WJ and ZB were responsible for K. I typed F, then I tried several groups of small data and felt that I was ready to hand over the data. The result returned to WA, which made me feel cool. At this time, Wj said that the formula seemed a bit problematic and then changed another formula, after I thought about it, it seemed right. Then I continued to change it and handed it back to WA. Then I felt a little uncertain. Then WJ found that this formula seemed to be faulty, so I got up and down from the location, and the time may be too short. So at this time, I put f for a moment, and then I will do what they keep thinking about K, based on some of their previous ideas, I found that this question has something to do with GCD. Then I thought about it, however, I am the least familiar with some of the items + 1-1, So I thought about it for a long time and got the correct solution. I handed it in to 1A. Later, I thought about F with WJ, and ZB had some idea about I. He also discussed it with WJ, so I asked ZB to come first, I think about the formula F together with WJ. When I thought about it with WJ, there were a lot of ideas that were very close to positive solutions, but in the end I could only say that everything was still a little worse. In the future, WJ and I have never been able to put F down, because in so many questions, only f is the most popular, and WJ and I both feel that this question cannot be solved, in the end, we had to give up on question F only half an hour, but it was too late at that time, and ZB had been struggling to adjust I, however, my network design skills are too poor. It may take me half an hour to understand the question. I have to rely on WJ and ZB to look after each other's questions and see if I can find any pitfalls. Finally, the three of us can only watch the two questions to end the competition.

The process of the competition may be like a journal. The reasons for the failure are as follows.

1. There is a lack of observation on the list and discussion on the topic's objective. When I completed the match, I tried to give the formula F for WJ, but in fact this question is not that simple, as long as you carefully observe the list, you will find very few people, and many people have wa several times. If I can read more questions and think more about examples at that time, two people will discuss it more and confirm the meaning of the question. Maybe the previous one hour can be used more to think about positive solutions, or to think about K. K will not be available for so long.

2. Lack of a good mentality and a sense of cooperation. I usually think about exercises in practice competitions, so I am willing to jump into the trap when I think about it. I can think about it for more than two hours by myself. If I think about my luck, I will take the question into consideration, if you are not lucky, you will lose all the game. This is the case in Fudan's online competition. Therefore, in the face of some difficult questions, it is easy to get stuck in the cage if you cannot think of them during the official competition, trap yourself. Especially question F, because I have always been thinking about this question because I have a certain mentality, but frankly speaking, it was hard for me to come up with this question during the competition, but I spent all the time there, and finally stuck myself to death. I was willing to put F down only half an hour after the competition, but it was too late to go to the I written by ZB because I didn't know about the Internet, as a result, it may take a long time for me to understand the meaning of the question. At last, I could not contribute any ideas.

3. The reason for the question. Fudan's questions are indeed far away from what we are good at, without some data structures that we are familiar with, DP, and more mathematics and yy, it is really hard to do. For this set of questions, I think if our team adopts the proper competition strategy and plays well, it will often be able to reach the level of 4 questions. The four questions cannot be answered.

4. Question-making strategies. When ZB knocked on I in this competition, both WJ and I were thinking about F. However, one of the pitfall questions like I should have a look at it, after all, ZB is under a lot of pressure on him when I think about it. We should make sure that we can get out first, for example, if question F lacks some flashing ideas, it should be better for only one person.

5. There are also some external reasons, of course. I usually use my computer to knock on the Code and change it to a new computer. The debugging process is also different from the normal one. These are external, but if you are more familiar with them at ordinary times, it will be much more calm to start coding on the site.

 

Copper is a collection of characters, and it may be shadow. In the past few days, I have been immersed in this kind of lost mood. Sometimes I dream of hitting the iron again. However, there are ups and downs in life, and people cannot always immerse themselves in setbacks. Compared with the loss of the college entrance examination, the grief of losing friends is nothing. However, I really like ACM very much and love it very much. Such setbacks are really hard and painful.

The city of Xi'an may not bring me good memories, but as the coach said during the opening ceremony, it is also a kind of harvest to win the iron cast copper (although I always think that coach said this was too bad at the Opening Ceremony), but there is a certain truth in this sentence. Acmers all over the world strive for their own goals, and successfully take a group photo with a good medal. If they fail, they will go forward with the harvest of regret. It is always a kind of life.

Finally, I want to say something to myself and my teammates. Come on!

Conclusion of acm-icpc Xi'an Division