SRM 443

Here's the screencast: Streaming, AVI, MOV, AVI from narod.ru.

Once again the easy-hard-medium strategy worked quite well, although it was a bit more nervous this time (a submission with about 2 minutes to go in the coding phase, and a succesfull challenge with about 20 seconds to go in the challenge phase). It's funny how I've chosen over-complicated solutions for easy and hard problems (well, for hard the main idea is common to most solutions, but my implementation is too long and it took me too many iterations to even get that one), but got the easiest to implement one for the medium under the time pressure :)

The hard problem for the round is a reasonably complex example how matrix multiplication can chime in to speed up DP. If you want to learn the more advanced DP techniques, this problem might give you a level-up :)