LeetCode 1119. Remove Vowels from a String

原题链接在这里：https://leetcode.com/problems/remove-vowels-from-a-string/

题目：

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

Example 1:

Input: s = "leetcodeisacommunityforcoders"
Output: "ltcdscmmntyfrcdrs"

Example 2:

Input: s = "aeiou"
Output: "" 

Constraints:

• 1 <= s.length <= 1000
• s consists of only lowercase English letters.

题解：Check each character of string, if it is vowel, skip it. Otherwise, add it to the new string.

Time Complexity: O(n). n = s.length().

Space: O(1).

AC Java:

 1 class Solution {
 2     public String removeVowels(String s) {
 3         if (s == null || s.length() == 0){
 4             return s;
 5         }
 6         
 7         HashSet<Character> hs = new HashSet<>(Arrays.asList('a', 'e', 'i', 'o', 'u'));
 8         StringBuilder sb = new StringBuilder();
 9         for(int i = 0; i < s.length(); i++){
10             char c = s.charAt(i);
11             if (hs.contains(c)){
12                 continue;
13             }
14             
15             sb.append(c);    
16         }
17         
18         return sb.toString();
19     }
20 }

标签：return,String,Vowels,length,sb,1119,new,LeetCode,string
来源： https://www.cnblogs.com/Dylan-Java-NYC/p/16291964.html