题解 | #提取不重复的整数#

import java.util.Scanner

fun main(args: Array<String>) {
    val read = Scanner(System.`in`)
    val res = read.nextLine()
    val rev = res.reversed().toInt().toString()
    val set = HashSet<Char>()
    rev.forEach {
        if(set.add(it)) {
            print(it)
        }
    }
}