Today is October 17, 2020. Today, the Blue Bridge Cup Provincial Tournament, from 9:00 to 13:00 in the morning, I feel okay as a whole. I don’t know much better than participating in the Blue Bridge Cup when I was a freshman.
Lanqiao Cup found its own omissions
In the morning when I tested the Lanqiao Cup, I found that I had some content that was very unskilled and even impossible to start. Here I will list it for myself first, so that I can have an entry point when practicing the algorithm later:
- Permutation problem
- There is no idea about tree-related issues, and I don’t even know how to construct the tree, let alone the left and right subtrees.
- java read file stream problem
There are these knowledge points in the Lanqiao Cup in the morning, but because I have not practiced the relevant content, it is very difficult to do the questions.
Hash mapping really works
The Blue Bridge Cup started at nine o'clock in the morning, and I came to the group more than eight o'clock in the morning. I looked at the content of the hash map I practiced before. I didn't expect that the Blue Bridge Cup this morning encountered related problems. It was a problem of dealing with the number of characters. At that time, I didn't want to arrange it directly with HashMap. I went through it again and it was really happy. Later, I encountered another question. There was an operation which also involved the problem of processing the number of characters. If nothing else, just paste the code of the previous question and modify it slightly. The main processing function is completed, and only one point is left. Arranged content.
I have to say that HashMap is really fragrant.