How to Solve Count Vowels Permutation Problem
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Count Vowels Permutation
Given an integer n, your task is to count how many strings of length n can be formed under the following rules: Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u') Each vowel 'a' may only b...
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Understanding the Count Vowels Permutation Problem
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Problem Statement
Given an integer n, your task is to count how many strings of length n can be formed under the following rules: Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u') Each vowel 'a' may only be followed by an 'e'. Each vowel 'e' may only be followed by an 'a' or an 'i'. Each vowel 'i' may not be followed by another 'i'. Each vowel 'o' may only be followed by an 'i' or a 'u'. Each vowel 'u' may only be followed by an 'a'. Since the answer may be too large, return it modulo 10^9 + 7.
Count Vowels Permutation
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Examples
n = 15All possible strings are: "a", "e", "i" , "o" and "u".
n = 210All possible strings are: "ae", "ea", "ei", "ia", "ie", "io", "iu", "oi", "ou" and "ua".
n = 568Constraints
1 <= n <= 2 * 10^4How Interview Coder Helps with Leetcode Problems
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