Expected score: 100+80+70+0=250
Actual score: 90+20+100+0=210
Hanging the score was miserable today!!!
T1
Simulation can be, a few minutes to write, but there are some corner case is very troublesome, dinner time to realize that there is no special judgment, the last few minutes immediately run up to change, I can not think of changing the wrong?
T2
It felt like one of those tricky math questions that only scored 80 violent points on the test, but, but, the last version of the linear sieve seems to have changed one thing! There was a problem with the sieve primes! 80->20! In the future, you shouldn't rush to eat at the end of the game, you should run another large sample to check. The positive solution is actually pretty good to think about, and I thought about it in that direction on the exam, but I never tried it because I kept thinking the complexity was bogus.
T3
The most tangible question, the theory of n^2 approach to get through? Become the only one only passed T3 players ...... is a simple tree dp, but the details of the classification of the discussion is particularly large, the examination took quite a lot of time! Fortunately, the last special judgment daisy chart + diameter of the top of the start traversal of these strange optimization mess mess over, otherwise it is not worth the loss!
T4
Good question, but so hard ...... Let it go for now.
To summarize: maybe the math problems should be tried more often? Run through all the samples before the end of the game! (Actually, CSP 2023 has already had this low-level error).