It's been a long time, and it's been abandoned for a long time recently. I finally have time to write my memories.
I also have to start reading the algorithm again and start brushing the questions. Only hard work will bring good luck.
There should be a lot of questions on the Internet. At that time, there were only two fill-in-the-blank questions, and the two major questions should have only partial marks. They were mixed with the third country. This year, the questions have become more difficult, and I am still too bad.
In fact, what I want to talk about the most is the second and third questions. The second question was unexpectedly a backpack. . . I hesitated for a long time in this question and didn't dare to start. Others said that they read the wrong question, but I saw it clearly. . . Still not. . .
The dfs of the third question is clearly written correctly, but I don't know why the numbers obtained are slightly worse.
The fifth question is also dfs, but I forgot to backtrack, so I haven't calculated the result. . .
In fact, the harvest is still quite a lot. Before going, I thought about traveling once. I was actually quite autistic when I came back. I was too lazy, and I had to keep practicing.
It is a pity that Peking University and Tsinghua University are not allowed to enter. I hope the next tour will be a regional competition, come on~!