Mistake in "Cracking the Coding Interview"

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I have a question on Cracking the Coding interview, 6th addition. I don't follow problem 12 of Big O notation. This function is a recursive function that counts all permutations of a string. The answer is stated to be N^2 ^ N!. I don't get why the author is adding the extra N? It takes N! iterations to get the N! permuations, and one final call of N! so shouldn't it be 2N! * N?

Any insights would be much appreciated.

-David R

- D.Schwartz.Rivera February 05, 2017 | Flag Reply

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