lucky_tickets.rs

fn lucky_tickets_count() -> i32 {
	fn digits(i:&i32) -> [i32; 6] {
	     [i % 10,
	     (i / 10) % 10,
	     (i / 100) % 10,
	     (i / 1000) % 10,
	     (i / 10000) % 10,
	     (i / 100000) % 10]
	}
	fn sum(a:&[i32]) -> i32 {
		return a.iter().fold(0, |acc, len| acc + len)
	}
	fn is_lucky(i:&i32) -> bool {
		let d = digits(i);
		return sum(&d[0..3]) == sum(&d[3..6])
	}
	return (0..1000000).filter(&is_lucky).count() as i32
}

LuckyTickets.kt

fun luckyTicketsCount():Int {
    fun digits(i:Int) = arrayOf(
            i % 10,
            (i / 10) % 10,
            (i / 100) % 10,
            (i / 1000) % 10,
            (i / 10000) % 10,
            (i / 100000) % 10
    )
    fun isLucky(i:Int):Boolean {
        return digits(i).take(3).sum() == digits(i).drop(3).sum()
    }
    return (0..999999).count(::isLucky)
}