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Amazon coding interview question and answer - recursive staircase problem!
For daily coding problems like this one, I’d recommend this website called Daily Coding Problem. You can find it here: https://csdojo.io/daily
(That’s a referral link, and you can get a 10% discount through that link. Their free option and blog articles are good, too, though.)
Outline (check my comment for the clickable outline):
0:07: Problem description
1:14: A variation of the problem
2:15: Thinking about simple cases
4:18: Finding a pattern
5:24: Relabeling the steps
6:41: Revisiting the pattern with the new labels
7:53: The pattern we’ve found - recap.
8:11: The recursive relationship we’ve found
8:50: What about when N = 0?
9:40: Writing a naive recursive solution
10:39: Why this solution is not efficient
11:24: How to fix it with dynamic programming (bottom-up)
12:27: The bottom-up solution in code
13:34: How to make it more efficient in terms of space
14:19: Solution to the variation of the problem
14:49: The recursive relationship for this problem (the variation)
15:08: A naive, INCORRECT recursive solution to this problem
15:50: A naive, CORRECT recursive solution to this problem
16:17: A naive, correct recursive solution in code
17:11: A dynamic programming / bottom-up approach
19:17: How to get daily coding problems like this one (go to https://csdojo.io/daily)
Also, keep in touch on Facebook: https://www.facebook.com/entercsdojo

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