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use std::collections::HashSet;
struct Solution;
impl Solution {
pub fn halves_are_alike(s: String) -> bool {
let vowels: HashSet<char> = HashSet::from(['a','e','i','o','u','A','E','I','O','U']);
s.chars()
.enumerate()
.filter(|(_, c)| vowels.contains(c))
.map(|(i, _)| (s.len() as i32 - 2 * (i as i32) - 1).signum())
.sum::<i32>() == 0
}
}
fn main() {
let s = String::from("book");
print!("{}", Solution::halves_are_alike(s));
}
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