Только что прошел очередной этап opencup-а. Предлагаю обсудить задачи здесь.
В частности, хотелось бы узнать решения H и J.
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Can anybody share their solution of D, I and J?
I: Firstly, if we will use songs with numbered songi1, songi2, ..., songik, then the total satisfaction will be maximized, if fi1 ≤ fi2 ≤ ... ≤ fik or fi1 ≥ fi2 ≥ ... ≥ fik. We wil sort of fi. Let's dp(i,j) — first i songs assigned and j total length of songs.
dp(i, j) = max{dp(k, j - ti) + pi - (fi - fk)2} = max{dp(k, j - ti) - fk2 + 2fkfi} + pi - fi2 Then we can use convex hull trick optimization. Code
Thanks a lot for your solution.
Hi! I'm writer of problem I! Thanks for your solving!
Hi, I'm the writer of the problem C and H. How was the problems?
I posted the solution of the problem D here.
Hi, can you show me your code for problem H? I always get TL on test 25. My code
UPD I found your code
Some of testers use min-cost-flow, and I used Hungarian method. My solution takes 180ms in worst case.
You can show my codes for all problems from here.
I'm the writer of the problem J. I posted my brief editorial for this problem as a blog entry.