Vamsi and Strings

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Vamsi has k different alphabets denoted as A1,A2…Ak. Vamsi wants to know how many strings of length n*k are possible where each alphabet appears n times such that ∀p |Aip| ≥ |Ajp| where 1 ≤ i ip| denotes the number of times the alphabet Ai appeared in the string till position p. Since the answer can be large, print the answer modulo 10^9+7. Input The first line of the input contains an inte

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solution.cppC++17

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