Count Vowel Strings in Ranges
You are given a 0-indexed array of strings words and a 2D array of integers queries.
Each query queries[i] = [li, ri] asks us to find the number of strings present at the indices ranging from li to ri (both inclusive) of words that start and end with a vowel.
Return an array ans of size queries.length, where ans[i] is the answer to the ith query.
Note that the vowel letters are 'a', 'e', 'i', 'o', and 'u'.
Example 1
Input
words = ["aba","bcb","ece","aa","e"], queries = [[0,2],[1,4],[1,1]]Output
[2,3,0]The strings starting and ending with a vowel are "aba", "ece", "aa", and "e", giving counts 2, 3, and 0 for the three queries.
Example 2
Input
words = ["a","e","i"], queries = [[0,2],[0,1],[2,2]]Output
[3,2,1]Every string satisfies the conditions, so each query returns the size of its range.
Constraints
- 1 <= words.length <= 10^5
- 1 <= words[i].length <= 40
- words[i] consists only of lowercase English letters.
- sum(words[i].length) <= 3 * 10^5
- 1 <= queries.length <= 10^5
- 0 <= li <= ri < words.length