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hey everyone welcome back and lets write some more neat code today so today lets solve the brand new problem from todays elite code contest number of ways to rearrange sticks with k sticks visible a pretty long name and this is a pretty difficult problem and it happens to be a dynamic programming problem so as with most dp problems its about how we can break this problem down into sub problems and then solve those sub problems so were given a list of n candles and each of them is a unique size of lengths from 1 to n we want to rearrange the sticks such that exactly k sticks are visible from the left side so basically with this input we would have three sticks that are visible one three and five the reason why two is not visible is theres a candle to the left of it thats even bigger so basically when we say visible its if youre looking from the left which candles would you be able to see you would not be able to see two because three is blocking it and you would also not be ab