문제 링크 (opens new window)

풀이

import Foundation

func solution(_ players:[String], _ callings:[String]) -> [String] {
    var ranking: [String: Int] = [:]
    var players = players

    for (rank, player) in players.enumerated() {
        ranking[player] = rank
    }

    // 1등이 불리면 오버플로우니까 제외됨
    for callee in callings {
        let front = players[ranking[callee]! - 1]

        players[ranking[callee]! - 1] = callee
        players[ranking[callee]!] = front

        ranking[callee]! -= 1
        ranking[front]! += 1
    }

    return players
}