Climbing the Leaderboard HackerRank - Medium Problem

.swift

func climbingLeaderboard(scores: [Int], alice: [Int]) -> [Int] {
    
    func findClosestNumberInBoard(forNumber number: Int) -> Int { //Functions for searching the closest score in table
        var left = 0                                              //with binary search
        var right = scores.count - 1
        var mid = 0
        
        while left <= right {
            mid = (left + right) / 2
            if number == scores[mid] {
                return scores[mid]
            } else if number >= scores[mid] {
                right = mid - 1
            } else {
                left = mid + 1
            }
        }
        return scores[mid]
        
    }
    
    var result: [Int] = []
    var places: [Int: Int] = [:] //Convert scores into places
    
    var place = 1
    for i in 0..<scores.count {
        if places[scores[i]] == nil {
            places[scores[i]] = place
            place += 1
        }
    }
    
    for aliceNumber in alice {
        let number = findClosestNumberInBoard(forNumber: aliceNumber)
        let placeForClosestNumber = places[number] ?? 0
        var alicePlace = 0
        if number > aliceNumber {
            alicePlace = placeForClosestNumber + 1
        } else {
            alicePlace = placeForClosestNumber
        }
        result.append(alicePlace)
    }
    
    return result
}