You are given a 0-indexed array of string words and two integers left and right.
A string is called a vowel string if it starts with a vowel character and ends with a vowel character where vowel characters are 'a', 'e', 'i', 'o', and 'u'.
Return the number of vowel strings words[i] where i belongs to the inclusive range [left, right].
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Example 1:
\n\n\nInput: words = ["are","amy","u"], left = 0, right = 2\nOutput: 2\nExplanation: \n- "are" is a vowel string because it starts with 'a' and ends with 'e'.\n- "amy" is not a vowel string because it does not end with a vowel.\n- "u" is a vowel string because it starts with 'u' and ends with 'u'.\nThe number of vowel strings in the mentioned range is 2.\n\n\n
Example 2:
\n\n\nInput: words = ["hey","aeo","mu","ooo","artro"], left = 1, right = 4\nOutput: 3\nExplanation: \n- "aeo" is a vowel string because it starts with 'a' and ends with 'o'.\n- "mu" is not a vowel string because it does not start with a vowel.\n- "ooo" is a vowel string because it starts with 'o' and ends with 'o'.\n- "artro" is a vowel string because it starts with 'a' and ends with 'o'.\nThe number of vowel strings in the mentioned range is 3.\n\n\n
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Constraints:
\n\n1 <= words.length <= 10001 <= words[i].length <= 10words[i] consists of only lowercase English letters.0 <= left <= right < words.lengthCompiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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