Fibonacci Number - Leetcode 509 - Dynamic Programming (Python)

[@GregHogg]

Master Data Structures & Algorithms For FREE at AlgoMap.io!

[@galdali10]

Great video! There is another way to solve it by using matrices; take the matrix[[1, 1], [1, 0]] and raise it to the power of n, then multiply it (from the right) by the column vector (1, 0) and take the lower row of this resulting vector. It will be in O(n) run time (to raise the matrix to the nth power (assuming one 2×2 matrix multiplication is in O(1))) and the space complexity is O(1)

[@Rose-gb1ku]

BEST VIDEO to get started with DP. Thanks a lot

[@omkarhatwalne3906]

Precise explanation, loved it!

[@GregHogg]

Glad to hear it 😊

[@ryuhayabusa3540]

Very nice explanation, I used a decorator approach to improve performance, but your solutions are amazing

[@GregHogg]

Thank you so much! And yeah, I assume you mean the @cache decorator. Wanted to avoid that for coding interviews. Thanks a ton!!

[@FrozenKnight21]

I kinda did this diffrently, but i guess it amounts to the same thing. I used an array, with a window, fulled in the first few values, then worked my way backwards. However, i had to later update it because i didnt realize there are negative fibanati numbers, and computing them is similar but a little trickier. But i did find a good work arround in the end.

[@GregHogg]

Uhm I don't think there is negative Fibonacci numbers

[@Pradyumna_P]

I love how he said, The steps of dynamic programming : Step 1 - don't use dynamic programming 😂😂

[@GregHogg]

It's true and I'll absolutely stand by this

[@ahsanhabibkhan6217]

Love the videos and shorts!

[@GregHogg]

Very glad to hear it, thank you :)

[@dabisrat]

Great video as always. I was curious why is the golden ratio solution log time? I figured it would be constant time.

[@GregHogg]

Thank you! It's because raising it to the power n is expensive

[@JamesKalam]

where is that x comes from

[@javedmiya3165]

Can you upload complete one shot python (covering all things required for dsa)

[@GregHogg]

Yeah I've got that video just search for full python course Greg hogg

[@ismaelherrera2978]

sublime

[@GregHogg]

Haha awesome

[@phanquan579]

Cool!

[@GregHogg]

Awesome :)

[@jakeschouten4331]

👍

[@GregHogg]

Ikr

[@ayushdey5342]

69th like... lets gooo

[@GregHogg]

Great number