题解 | 最长无重复子数组

object Solution {
    /**
    * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
    *
    * 
        * @param arr int整型一维数组 the array
        * @return int整型
    */
    fun maxLength(arr: IntArray): Int  {
        if (arr.isEmpty())return 0
        var left = 0
        val screen = HashSet<Int>()
        var maxLength = 0
        for(right in 0..arr.size-1){
            while(screen.contains(arr[right])){
                screen.remove(arr[left])
                left++
            }
            screen.add(arr[right])
            maxLength = Math.max(maxLength, right-left+1)
        }
        return maxLength
    }
}