题解 | #字符串排序#

fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).unwrap();
    let n = s.trim().parse::<i32>().unwrap();
    let mut v = Vec::new();
    for _ in 0..n {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).unwrap();
        v.push(s);
    }
    v.sort();
    v.iter().for_each(|x| print!("{}", x));
}