Return value of the code

#1

In the first two cases (base cases), how is the return value being determined?
Q.1. I mean, why have we returned 1 when n==0 and why return 0 when n<0.
Q.2. In the latter case, can we return -1 ( when n<0)

(Code snap attached for reference)

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#2

when n=0
means we have to find no of ways to reach at ground
which are 1 ways only

when n is negative then obviously there is no way to go in basement as basement doesn’t exits :slightly_smiling_face:

to “do nothing” there is also one way that is “do nothing”
:smile:

i hope this help
if you have any doubts feel free to ask
if doubt resolved don’t forgot to mark doubt as resolved

#3

Yeah I had similar thoughts about the case when n<0. To do nothing, there is only one way, then the return value should be 1 just like when n==0, why return 0 in the second case?

#4

for the case which doesn’t exist
there is no way to do it
because it doesn’t exist
n<0 doesn’t exist
there is no basement :smile:

#5

Thank you :slight_smile:

#6

in the bottom of any content(video or qeuestion) where you have asked this doubt
go there (in this case you have asked your doubt on a challenge “ ladders-problem-recursion”)

at bottom you find same as this

image
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now at bottom-right you find a option of “mark as resolved”

#7

There seems to be some glitch. I mark it as resolve and when I refresh the page, it is unresolved aagain. It’s not for the first time that it’s happened. Pls send the rating link, it helps me close the thread.

#8

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