Solution: Count the Number of Good Subsequences
Understand how to calculate the number of good subsequences in a string by applying dynamic programming techniques and binomial coefficients. Learn to efficiently use factorials with modular inverses to optimize counting combinations, ensuring you can solve this common coding interview pattern problem effectively.
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We'll cover the following...
Statement
Count and return the number of good subsequences in the given string s. You may return the modulo
A subsequence is a sequence formed from another sequence by deleting some or no elements while keeping the order of the remaining elements unchanged.
A good subsequence is a subsequence of a string if it is not empty and the frequency of each character is the same.
Constraints:
s.lengthswill only contain ...