[프로그래머스] 달리기 경주

function solution(players, callings) {
    
  	// indexOf는 느리므로, Object를 활용해 선수 인덱스를 관리함
    const playerDict = {}
    players.forEach((player, pIdx) => playerDict[player] = pIdx)
    
    // 호명된 선수를 순회하며 순위 변경사항 반영
    for(let i = 0 ; i < callings.length ; i ++) {
        const curPlayer = callings[i]
        const playerIdx = playerDict[curPlayer]
        const slowerPlayer = players[playerIdx-1]
        
        players[playerIdx-1] = curPlayer
        players[playerIdx] = slowerPlayer
        
        playerDict[curPlayer] = playerIdx-1
        playerDict[slowerPlayer] = playerIdx
    }
    
  	// 결과 반환
    return players
}