Valid word

String

50.9% acceptance

Feb 24, 2026

480

169

A word is considered valid if: It contains a minimum of 3 characters. It contains only digits (0-9), and English letters (uppercase and lowercase). It includes at least one vowel. It includes at least one consonant. You are given a string word. Return true if word is valid, otherwise, return false. Notes: 'a', 'e', 'i', 'o', 'u', and their uppercases are vowels. A consonant is an English letter that is not a vowel.

Solution

Rust

Time O(n)

Space O(1)

LeetCode

solution.rs

impl Solution {
  pub fn is_valid(word: String) -> bool {
    if word.len() < 3 {
      return false;
    }
    let vowels = b"aeiouAEIOU";
    let mut has_vowel = false;
    let mut has_consonant = false;
    for &b in word.as_bytes() {
      if b.is_ascii_alphanumeric() {
        if vowels.contains(&b) {
          has_vowel = true;
        } else if b.is_ascii_alphabetic() {
          has_consonant = true;
        }
      } else {
        return false;
      }
    }
    has_vowel && has_consonant
  }
}