unko_tower.rs

use std::env;

fn main(){
    let args: Vec<String> = env::args().collect();
    let num:i32 = args[1].parse::<i32>().unwrap();
    println!("{0: >width$ }","人", width= 2 + 2*num as usize);

    for i in 0..num {
        let width_left = (2*num - i*2 - 1) as usize;
        let width_right = (i*4 + 4) as usize;
        println!("{0:>width0$} {1:>width1$}","（","）", width0 = width_left, width1 = width_right );
    }
}