[BOJ] 1967번 : 숨바꼭질

문제 보기

kotlin

import java.util.*

fun main() = with(Scanner(System.`in`)) {
    val (n, k) = nextInt() to nextInt()
    val line = Array(100001) { -1 }
    val queue: Queue<Int> = LinkedList()

    line[n] = 0
    queue.offer(n)

    while (queue.isNotEmpty()) {
        val current = queue.poll()
        val dx = intArrayOf(1, -1, current)

        for (dir in dx.indices) {
            val next = current + dx[dir]

            if (next < 0 || next > 100000) continue
            if (line[next] != -1) continue

            line[next] = line[current] + 1
            queue.offer(next)
        }
    }

    print(line[k])
}