pub fn find_error_nums(numbers: Vec<i32>) -> Vec<i32> {
  // Uncomment FromIterator in Leetcode since they're using Rust Edition 2018.
  // Edition 2021 has this trait in its prelude.

  // use std::iter::FromIterator;
  use std::collections::HashSet;

  let range = 1..=numbers.len() as i32;
  let mut numbers_set = HashSet::<_>::new();

  let mut duplicate = 0;

  for number in numbers {
    if numbers_set.insert(number) {
      continue;
    }

    duplicate = number;
  }

  let mut missing = 0;

  for number in range {
    if !numbers_set.contains(&number) {
      missing = number;
      break;
    }
  }

  vec![duplicate, missing]
}