Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
A *vowel substring* is a contiguous substring that consists only of vowels (`a`, `e`, `i`, `o`, `u`) and contains *every* one of these vowels at least once. Given a word, return the number of vowel substrings it has.
Example
word = "aeiouu" → 2
Constraints
1 ≤ word.length ≤ 100 · word consists of lowercase English letters.
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