Solving https://codeforces.com/problemset/problem/1716/A

Move.kt

import kotlin.math.*

fun debugln(str: String) = println(str)
//fun debugln(@Suppress("UNUSED_PARAMETER") unused: String) = {}

fun main() {
    fun search(distance: Int): Int = when (distance) {
        1 -> 2
        2 -> 1
        3 -> 1
        4 -> 2
        else -> {
            val threes = distance / 3
            when (distance % 3) {
                0 -> threes
                2 -> threes + search(2)
                1 -> threes - 1 + search(1 + 3) // Step back and make the remaining 4.
                else -> throw RuntimeException("Should never be here!")
            }
        }
    }

    val ntests = readLine()!!.toInt()
    repeat(ntests) {
        val distance = readLine()!!.toInt()
        val steps = search(distance)
        println("${steps}")
    }
}