Count subsequences

#1

i am getting wrong answer through this code
can you tell me my mistake ??
here it is…

#2

hi aditi,
Your code is correct, but there are some cases in MODS in which they make the values negative.
I have marked that in comments.
In future codes also whenever you use mods,just write that line to be safe.


Please let me know if there is any other doubt.

#3

okay i got it. thank you!!