### mahim007's blog

By mahim007, history, 3 years ago, ,

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 » 3 years ago, # |   0 Your solution has complexity of O(N) per single tower, which results in O(m*N) per test-case which unfortunately is not fast enough. One could easily notice, however, that the dp states will be the same for the same K and L and are independent of N, so you can compute the states only for the largest tower (biggest N), thus resulting in O(N) per test-case.I managed to get AC modifying your code to do just that, so feel free to ask any questions :)
•  » » 3 years ago, # ^ |   0 sorry for my late reply. would u kindly describe the way more elaborately?? since i am new to dp i find it difficult :( any clue,hints,idea will be greatly appreciated :)
•  » » » 3 years ago, # ^ |   0 Well let's consider the example. We have : 2 3 5 3 12 113 25714 88888 So what your solution will do is calculate the states from 1 to 3, then from 1 to 12, then from 1 to 113, then from 1 to 25714, then from 1 to 88888. However you can instead calculate them just once from 1 to 88888 and then use dp[3], dp[12], dp[113], dp[25714] and dp[88888] to answer your queries. Do you understand what I mean?
•  » » » » 3 years ago, # ^ |   +13 yes Enchom bro,i completely understand your idea.even if i never understand a problem so well before :D i implement as you said and got accepted :) :) thank u so much.
•  » » 15 months ago, # ^ |   0 Although I got AC in one go the time was 0.34seconds.But after optimizing my algorithm according to your suggestion time reduced to 0.01seconds.Thank You ;)
 » 2 years ago, # |   0 hey.. can you please give me any hints on writing a recursive solution to this problem.. I would be so grateful if you do :D
•  » » 2 years ago, # ^ |   0
•  » » » 2 years ago, # ^ |   0 thanks for the explanation... got AC using recursion :)