프로그래머스 [가장 많이 받은 선물]

class Solution {

    fun solution(friends: Array<String>, gifts: Array<String>): Int {

        var giftScoreList = calculateGiftScore(friends,gifts)

        var giftTradeInfo = calculateTradeCount(friends,gifts)

        var nextMonthReceive = Array(friends.size,{0})

        

        for(i in 0 until giftTradeInfo.size-1){

            for(j in i+1 until giftTradeInfo[i].size){

                if(giftTradeInfo[i][j] > giftTradeInfo[j][i]) nextMonthReceive[i]++

                else if(giftTradeInfo[i][j] == giftTradeInfo[j][i])

                {

                    if(giftScoreList[i] == giftScoreList[j]) continue

                    else if(giftScoreList[i] > giftScoreList[j]) nextMonthReceive[i]++

                    else nextMonthReceive[j]++

                }

                else nextMonthReceive[j]++

            }

        }

        return nextMonthReceive.maxOrNull()?:0

    }

    

    private fun calculateGiftScore(friends : Array<String>,giftsInfo : Array<String>) : Array<Int>{

        var giftScoreList = Array(friends.size,{0})

        giftsInfo.forEach{

            val giftsInfo = it.split(" ")

            val sendFriend = giftsInfo[0]

            val receiveFriend = giftsInfo[1]

            if(friends.indexOf(sendFriend) != -1) giftScoreList[friends.indexOf(sendFriend)]++

            if(friends.indexOf(receiveFriend) != -1)giftScoreList[friends.indexOf(receiveFriend)]--

        }

        return giftScoreList

    }

    

    private fun calculateTradeCount(friends : Array<String>,giftsInfo : Array<String>) : Array<IntArray>{

        var giftTradeInfo = Array<IntArray>(friends.size,{IntArray(friends.size,{0})})

        giftsInfo.forEach{

            val giftsInfo = it.split(" ")

            val sendFriend = giftsInfo[0]

            val receiveFriend = giftsInfo[1]

            if(friends.indexOf(sendFriend) != -1 && friends.indexOf(receiveFriend) != -1){

                giftTradeInfo[friends.indexOf(sendFriend)][friends.indexOf(receiveFriend)]++

            }

        }

       return giftTradeInfo

    }

}