Count Vowel Substrings of a String - Solution & Explanation

This approach involves iterating over all possible substrings of the given string and checking if each substring contains all the vowels ('a', 'e', 'i', 'o', 'u'). This is a straightforward method but not optimized due to the nested loop structure.

The solution in C involves two nested loops to iterate over all possible substrings. Each substring is then checked for the presence of all five vowels using the helper function 'containsAllVowels'. The 'isVowel' function helps in determining if a character is part of the vowels.

This approach leverages a sliding window mechanism to efficiently find substrings containing all vowels. By keeping track of the vowel count, the window can be expanded and contracted to find matches, significantly reducing unnecessary duplicate work.

The C implementation uses a sliding window to efficiently manage the range in which all vowels appear. When a non-vowel is encountered, the state is reset, improving performance over analyzing static substrings.