카카오신입공채 코딩테스트 1차(JAVA)

KakaoTest2.java

package com.jacknie.doodle.kakao;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class KakaoTest2 {
	
	static final Pattern DART_RESULT_PATTERN = Pattern.compile("(\\d{1,2})([SDT])([*#]?)");

	public static void main(String[] args) {
		System.out.println(calculateDartPoint("1S2D*3T"));
		System.out.println(calculateDartPoint("1D2S#10S"));
		System.out.println(calculateDartPoint("1D2S0T"));
		System.out.println(calculateDartPoint("1S*2T*3S"));
		System.out.println(calculateDartPoint("1D#2S*3S"));
		System.out.println(calculateDartPoint("1T2D3D#"));
		System.out.println(calculateDartPoint("1D2S3T*"));
	}
	
	static int calculateDartPoint(String dartResult) {
		int sumPoint = 0;
		Matcher matcher = DART_RESULT_PATTERN.matcher(dartResult);
		int beforePoint = 0;
		while (matcher.find()) {
			int point = Integer.parseInt(matcher.group(1));
			String bonus = matcher.group(2);
			String option = matcher.group(3);
			if ("*".equals(option)) {
				sumPoint += calculateOption(beforePoint, option);
			}
			else {
				sumPoint += beforePoint;
			}
			int bonusPoint = calculateBonus(point, bonus);
			beforePoint = calculateOption(bonusPoint, option);
		}
		
		return sumPoint + beforePoint;
	}
	
	static int calculateBonus(int point, String bonus) {
		if ("S".equals(bonus)) {
			return point;
		}
		if ("D".equals(bonus)) {
			return (int) Math.pow(point, 2);
		}
		if ("T".equals(bonus)) {
			return (int) Math.pow(point, 3);
		}
		throw new IllegalStateException();
	}
	
	static int calculateOption(int point, String option) {
		if (option.isEmpty()) {
			return point;
		}
		if ("*".equals(option)) {
			return point * 2;
		}
		if ("#".equals(option)) {
			return point * -1;
		}
		throw new IllegalStateException();
	}
}