Given the frequency of each lowercase character f(a), f(b)... f(z) and k. Compute the number of unique strings of length k having sorted characters.
k <= 10^5
Sum(f(i)) <= 10^5
Please provide Hints/Approach to solve this problem.
Given the frequency of each lowercase character f(a), f(b)... f(z) and k. Compute the number of unique strings of length k having sorted characters.
k <= 10^5
Sum(f(i)) <= 10^5
Please provide Hints/Approach to solve this problem.
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