A vowel substring is a substring that only consists of vowels ('a', 'e', 'i', 'o', and 'u') and has all five vowels present in it. Given a string word, return the number of vowel substrings in word.
Question Explain
This question asks you to count and return the number of substrings in a certain string. This string contains only vowel characters and must contain all five vowels: 'a', 'e', 'i', 'o', and 'u'.
To solve this problem, remember that a substring is a contiguous sequence of characters within a string.
For instance, in the word string "hello", the substrings would be,
- "he"
- "ell"
- "llo"
- "hello"
- and so forth.
In this particular question, however, we are only interested in those substrings that consist entirely of the five vowel characters 'a', 'e', 'i', 'o', 'u'. More specifically, these substrings should include all five vowels.
Here are some key points to consider:
- Check if the word has all five vowels. If it doesn't, return 0 as it will not have any vowel substrings.
- If it does, iterate over the word to find all vowel substrings. This could be achieved with a sliding-window strategy where you maintain a window of characters and move it across the word.
- Keep a counter for each vowel and increment the counter every time a vowel is encountered.
- Reset counters whenever a non-vowel is encountered.
- Keep a count of the valid substrings found, and return this count as the result.
Answer Example 1
Consider a word "aeiou":
- This word consists only of the five vowels 'a', 'e', 'i', 'o', 'u'.
- As such, it constitutes a single valid vowel substring.
- The function should return 1 given this input.
Answer Example 2
Consider a word "aeiobcdouaei":
- This word has multiple substrings that include the five vowels.
- Substrings could be "aeiobcdou", "eiobcdoua", "iobcdouaei".
- Another substring would also be "obcdouaei".
- All these substrings have all the five vowels.
- Therefore, the function should return 4 given this input.
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