1119. Remove Vowels from a String

Given a string S, remove the vowels 'a', 'e', 'i', 'o', and 'u' from it, and return the new string.

Example 1:

Input: "leetcodeisacommunityforcoders"
Output: "ltcdscmmntyfrcdrs"

Example 2:

Input: "aeiou"
Output: ""

Note:

1. S consists of lowercase English letters only.

2. 1 <= S.length <= 1000

string removeVowels(string S) { // time: O(n); space: O(n)
    if (S.empty()) return S;
    int n = S.length();
    string vowels = "aeiouAEIOU", res;
    for (int i = 0 ; i < n; ++i) {
        if (vowels.find(S[i]) == string::npos) res += S[i];
    }
    return res;
}