fn main(){}

use std::{slice::Iter, cmp::{max, self}, mem::replace, collections::{HashSet, HashMap}, ops::Index, ascii::AsciiExt};
use rand::Rng;
use regex::Regex;
use md5;
use std::any::{Any, TypeId};

/*

    Given a positive integer n, return the count of the numbers of n-digit
    positive integers that start or end with 1.
    
*/
fn starts_one_ends(n:i32) -> i32{


    if n == 1 {
        return 1;
    };
    return 18 * i32::pow(10, (n - 2) as u32);
}
