Count subsequences

#1


getting wrong answer in 4 testcases. pls tell the correct code.

#2

@yutikakhanna
a) In the question we are asked only number of ways so no need to generate all subsequence because time complexity is high for this solution

b) refer method 2 of this article to understand the approach -> https://www.geeksforgeeks.org/count-distinct-subsequences/

c)solution -> https://ide.codingblocks.com/s/208159

#3

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