【题目】1704. Determine whether the two halves of a string are similar
You are given a string s of even length. Split it into two halves of equal length, the first half being a and the second half being b.
Two strings are similar if they both contain the same number of vowels ('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'). Note that s may contain both uppercase and lowercase letters.
Returns true if a and b are similar; otherwise, returns false.
Example 1:
输入：s = "book"
输出：true
解释：a = "bo" 且 b = "ok" 。a 中有 1 个元音，b 也有 1 个元音。所以，a 和 b 相似。
Example 2:
输入：s = "textbook"
输出：false
解释：a = "text" 且 b = "book" 。a 中有 1 个元音，b 中有 2 个元音。因此，a 和 b 不相似。
注意，元音 o 在 b 中出现两次，记为 2 个。
hint:
2 <= s.length <= 1000
s.length 是偶数
s 由 大写和小写 字母组成
[Problem-solving ideas 1]
class Solution {
public boolean halvesAreAlike(String s) {
String a = s.substring(0, s.length() / 2);
String b = s.substring(s.length() / 2);
String h = "aeiouAEIOU";
int sum1 = 0, sum2 = 0;
for (int i = 0; i < a.length(); i++) {
if (h.indexOf(a.charAt(i)) >= 0) {
sum1++;
}
}
for (int i = 0; i < b.length(); i++) {
if (h.indexOf(b.charAt(i)) >= 0) {
sum2++;
}
}
return sum1 == sum2;
}
}