[Kotlin] Programmers 코딩테스트 입문 Day 20 수학, 시뮬레이션, 문자열, 사칙연산

직사각형 넓이 구하기

import kotlin.math.absoluteValue
class Solution {
    fun solution(dots: Array<IntArray>): Int {
    var x = intArrayOf()
    var y = intArrayOf()

    for (i in dots){
        x = x.plus(i[0])
        y = y.plus(i[1])
    }

    x.sort()
    y.sort()
    
    val xLen = x[3] - x[0]
    val yLen = y[3] - y[0]

    return (xLen * yLen).absoluteValue
}

}

 

 

 

캐릭터의 좌표

class Solution {
    fun solution(keyinput: Array<String>, board: IntArray): IntArray {
        var x = 0
        var y = 0

        for (i in keyinput){
            when(i){
                "left" -> x -= 1
                "right" -> x += 1
                "up" -> y += 1
                "down" -> y -= 1
            }
            if (x>board[0]/2) x = board[0]/2
            if (x<-board[0]/2) x = -board[0]/2
            if (y>board[1]/2) y = board[1]/2
            if (y<-board[1]/2) y = -board[1]/2
        }


        return intArrayOf(x,y)
    }
}

 

 

 

최댓값 만들기 (2)

class Solution {
    fun solution(numbers: IntArray): Int {
        numbers.sort()
        var result1 = numbers[0] * numbers[1]
        var result2 = numbers[numbers.size-1] * numbers[numbers.size-2]

        if (result1 > result2) return result1
        return result2
    }
}

 

 

 

다항식 더하기

class Solution {
    fun solution(polynomial: String): String {
        var num = 0
        var x = 0
        var answer = ""

        val poly = polynomial.split(" ")

        for (i in poly){
            if (i.contains("x")){
                var temp = i.replace("x", "")
                if (temp.length > 0) x += temp.toInt()
                else x++
            }else if (i != "+") num += i.toInt()
        }
        if (x > 0){
            if (num > 0) {
                if (x == 1) answer = "x + $num"
                else answer = "${x}x + $num"
            }else{
                if (x == 1) answer = "x"
                else answer = "${x}x"
            }
        }else{
            if (num > 0) {
                answer = "$num"
            }
        }

        return answer
    }
}