[백준] 스택 (10828)(Kotlin)

원본 문제 : https://www.acmicpc.net/problem/10828

문제 참고 : https://bcp0109.tistory.com/83

 

<첫번째>

import java.io.*
import java.util.*

fun main() = with(BufferedReader(InputStreamReader(System.`in`))){

    val br = BufferedReader(InputStreamReader(System.`in`))
    val stack = Stack<Int>()
    val bw = BufferedWriter(OutputStreamWriter(System.out))

    repeat(readLine().toInt()) {
        val input = readLine().split(" ")

        when(input[0]) {
            "push" -> stack.push(input[1].toInt())
            "pop" -> bw.write("${if (stack.empty()) - 1 else stack.pop() }\n")
            "size" -> bw.write("${stack.size}\n")
            "empty" -> bw.write("${if (stack.empty()) 1 else 0}\n")
            "top" -> bw.write("${if (stack.empty()) -1 else stack.peek() }\n")
        }
    }
    bw.flush()
}