Problem 4, "Five programming problems every Software Engineer should be able to solve in less than 1 hour"

problem4.rs

// Problem 4 - https://blog.svpino.com/2015/05/07/five-programming-problems-every-software-engineer-should-be-able-to-solve-in-less-than-1-hour
// https://play.rust-lang.org/

fn solve(list: &[u32]) -> String {
  let mut list = list.iter()
    .map(|&n| n.to_string())
    .collect::<Vec<String>>();
  list.sort_by(|a,b| {
    format!("{:=<10}", b).cmp(&format!("{:=<10}", a))
    // Ex) [420, 42, 423] --> "42=" > "423" > "420"
  });
  list.connect("")
}

fn main() {
  println!("solve={}", solve(&[50, 2, 1, 9]));
  println!("solve={}", solve(&[420, 42, 423]));
  println!("solve={}", solve(&[1, 10, 11]));
}