프로그래머스 키패드 누르기 자바스크립트

<문제>

https://school.programmers.co.kr/learn/courses/30/lessons/67256

프로그래머스

 

 

<나의 풀이>

 

function solution(numbers, hand) {
    var answer = '';
    let numbersIndex = {
        1 : [0,0],
        2 : [0,1],
        3 : [0,2],
        4 : [1,0],
        5 : [1,1],
        6 : [1,2],
        7 : [2,0],
        8 : [2,1],
        9 : [2,2],
        0 : [3,1],
        "*" : [3,0],
        "#" : [3,2],
    };
    let left = [1,4,7]
    let right = [3,6,9]
    let leftHand = "*";
    let rightHand = "#";
    
    for(let i = 0; i < numbers.length; i++) {
        if(left.includes(numbers[i])) {
            answer += "L"
            leftHand = numbers[i]
        }
        
        else if (right.includes(numbers[i])) {
            answer += "R"
            rightHand = numbers[i]
        }
        
        else {
            let r = numbersIndex[rightHand]
            let l = numbersIndex[leftHand]
            let c = numbersIndex[numbers[i]]
            
            let rDistance = Math.abs(c[0] - r[0]) + Math.abs(c[1] - r[1])
            let lDistance = Math.abs(c[0] - l[0]) + Math.abs(c[1] - l[1])
            
            if(rDistance > lDistance) {
                answer += "L";
                leftHand = numbers[i]
            }
                
            else if(rDistance < lDistance) {
                answer += "R";
                rightHand = numbers[i]
            }
            
            else {
                if(hand === "right") {
                    answer += "R";
                    rightHand = numbers[i]
                }
                
                else {
                    answer += "L";
                    leftHand = numbers[i]
                }
                
            }
            
        }
    }
    
    
    return answer;
}

 

 

<다른 사람의 풀이>

 

function solution(numbers, hand) {
  hand = hand[0] === "r" ? "R" : "L"
  let position = [1, 4, 4, 4, 3, 3, 3, 2, 2, 2]
  let h = { L: [1, 1], R: [1, 1] }
  return numbers.map(x => {
    if (/[147]/.test(x)) {
      h.L = [position[x], 1]
      return "L"
    }
    if (/[369]/.test(x)) {
      h.R = [position[x], 1]
      return "R"
    }
    let distL = Math.abs(position[x] - h.L[0]) + h.L[1]
    let distR = Math.abs(position[x] - h.R[0]) + h.R[1]
    if (distL === distR) {
      h[hand] = [position[x], 0]
      return hand
    }
    if (distL < distR) {
      h.L = [position[x], 0]
      return "L"
    }
    h.R = [position[x], 0]
    return "R"
  }).join("")
}