42862.kt

import kotlin.math.abs
class Solution {
    fun solution(n: Int, lost: IntArray, reserve: IntArray): Int {

        var lost2 = lost.toMutableList()
        var reserve2 = reserve.toMutableList()
        var dup = mutableListOf<Int>()

        for (l in lost2){
            for (r in reserve2){
                if (l == r){
                    dup.add(l)
                }
            }
        }

        for (d in dup){
            lost2.remove(d)
            reserve2.remove(d)
        }

        var answer = n - lost2.size

        for (l in lost2){

            for (r in reserve2){

                val diff = abs(l-r)

                if (diff < 2){
                    answer ++
                    reserve2.remove(r)
                    break
                }

            }
        }

        return answer
    }
}