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struct Solution;
impl Solution {
pub fn max_length(arr: Vec<String>) -> i32 {
let mut ans: u32 = 0;
let mut unique: Vec<u32> = Vec::new();
for s in arr {
let bin: u32 = s.bytes().map(|c| 1 << (c - b'a')).sum();
if bin.count_ones() == s.len() as u32 {
unique.push(bin);
}
}
let mut concat: Vec<u32> = vec![0];
for u in unique {
for i in 0..concat.len() {
if (concat[i] & u).count_ones() == 0 {
concat.push(concat[i] | u);
ans = ans.max(concat[i].count_ones() + u.count_ones());
}
}
}
ans as i32
}
}
fn main() {
let arr = vec!["un".to_string(),"iq".to_string(),"ue".to_string()];
print!("{}", Solution::max_length(arr));
}
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