릿코드 1624. Largest Substring Between Two Equal Characters 코틀린

다 해시맵에 넣고 2이상인거 퍼스트인덱스 라스트인덱스해서 max랑 비교후 max리턴

정답

import kotlin.math.max

class Solution {
    fun maxLengthBetweenEqualCharacters(s: String): Int {
        val charHashMapOf = hashMapOf<Char, Int>()
        var res=-1
        for (i in s){
            charHashMapOf[i]=charHashMapOf[i]?.plus(1)?: 1
        }
        for ((key,value) in charHashMapOf){
            if (value<=1){
                continue
            }
            val tempLength=s.indexOfLast { it==key }-s.indexOfFirst { it==key }-1
            res= max(res,tempLength)
        }
        println(charHashMapOf)
        println(s.indexOfFirst { it=='a' })
        println(s.indexOfLast { it=='a' })
        println(res)
        return res
    }
}