AOJ - ITP2 - Rust

use std::io;
 
fn read<T: std::str::FromStr>() -> Vec<T> {
    let mut buf = String::new();
    io::stdin().read_line(&mut buf).unwrap();
    buf.trim().split(' ').flat_map(str::parse).collect()
}


fn main() {
    let mut a = Vec::new();
    let q = read::<i32>();
    for _i in 0..q[0] {
        let query = read::<i32>();
        if query.len() == 1 {
            a.pop();
        } else if query[0] == 0 {
            a.push(query[1])
        } else if query[0] == 1 {
            println!("{}", a[query[1] as usize])
        }
    }
}