[2020카카오인턴십] 키패드 누르기 - JAVA

package programmers.level1;

import java.util.HashMap;
import java.util.Map;

/**
 * https://programmers.co.kr/learn/courses/30/lessons/67256
 * 2020 카카오인턴십 키패드누르기
 */
public class PushKeypad2 {

    static int left_loca = 10;
    static int right_loca = 12;


    public static void main(String[] args) {
        solution(new int[]{1, 3, 4, 5, 8, 2, 1, 4, 5, 9, 5}, "left");
    }

    public static String solution(int[] numbers, String hand) {

        Map<Integer,Integer> xMap = new HashMap<>();
        Map<Integer,Integer> yMap = new HashMap<>();
        StringBuilder answer = new StringBuilder();

        int left_dist = 0;
        int right_dist = 0;
        int num = 1;

        // * => 10 // # => 12
        for(int i=0;i<4;i++){
            for(int j=0;j<3;j++){
                xMap.put(num == 11 ? 0 : num ,i);
                yMap.put(num == 11 ? 0 : num ,j);
                num++;
            }
        }

        for(int number : numbers){
            if(number == 1 || number == 4 || number == 7){
                setLeft(number, answer);
            }else if(number == 3 || number == 6 || number == 9){
                setRight(number, answer);
            }else{ // 2,5,8,0
                left_dist = Math.abs(xMap.get(number)-xMap.get(left_loca))+Math.abs(yMap.get(number)-yMap.get(left_loca));
                right_dist = Math.abs(xMap.get(number)-xMap.get(right_loca))+Math.abs(yMap.get(number)-yMap.get(right_loca));

                if(left_dist<right_dist){
                    setLeft(number, answer);
                }else if(left_dist>right_dist){
                    setRight(number, answer);
                }else{
                    if(hand.equals("left")){
                        setLeft(number, answer);
                    }else{
                        setRight(number, answer);
                    }
                }
            }
        }

        return answer.toString();
    }

    static void setLeft(int number, StringBuilder answer){
        left_loca = number;
        answer.append("L");
    }

    static void setRight(int number, StringBuilder answer){
        right_loca = number;
        answer.append("R");
    }

}