1704. Determine if String Halves Are Alike

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# 題目敘述

You are given a string s of even length. Split this string into two halves of equal lengths, and let a be the first half and b be the second half.

Two strings are alike if they have the same number of vowels ( 'a' , 'e' , 'i' , 'o' , 'u' , 'A' , 'E' , 'I' , 'O' , 'U' ). Notice that s contains uppercase and lowercase letters.

Return true if a and b are alike. Otherwise, return false .

# Example 1

Input: s = "book"
Output: true
Explanation: a = "bo" and b = "ok". a has 1 vowel and b has 1 vowel. Therefore, they are alike.

# Example 2

Input: s = "textbook"
Output: false
Explanation: a = "text" and b = "book". a has 1 vowel whereas b has 2. Therefore, they are not alike.
Notice that the vowel o is counted twice.

# 解題思路

# Solution

class Solution {

    public boolean halvesAreAlike(String s) {

        if(s.length() % 2 != 0){

            return false;

        }

        int subLen = s.length() / 2;

        String a = s.substring(0, subLen);

        String b = s.substring(subLen, s.length());

        a = a.replaceAll("[aeiouAEIOU]", "");

        b = b.replaceAll("[aeiouAEIOU]", "");

        return a.length() == b.length();

    }

}