Count Vowel Strings In Ranges With PHP Solution
Counting vowel strings in ranges: precompute prefix sum of vowel strings, use unordered_set for vowels, and subtract prefix sum for range [l-1, r] to find count. Complexity: O(n + q).
2559. Count Vowel Strings in Ranges Difficulty: Medium Topics: Array, String, Prefix Sum 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 in the range 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] Explanation:...