3813. Vowel-Consonant Score

You are given a string s consisting of lowercase English letters, spaces, and digits.

Let v be the number of vowels in s and c be the number of consonants in s.

A vowel is one of the letters 'a', 'e', 'i', 'o', or 'u', while any other letter in the English alphabet is considered a consonant.

The score of the string s is defined as follows:

• If c > 0, the score = floor(v / c) where floor denotes rounding down to the nearest integer.
• Otherwise, the score = 0.

Return an integer denoting the score of the string.

class Solution {
public:
    int vowelConsonantScore(string s) {
        int v = 0, c = 0;
        unordered_set<int> us{'a','e','i','o','u'};
        for(auto& ch : s) {
            if(!isalpha(ch)) continue;
            if(us.count(ch)) v++;
            else c++;
        }
        return c ? v / c : 0;
    }
};