判断数字集合是否连续递增

​​判断数字集合是否连续递增​​

fun judgeBookIllegal(list: List<Int>): Boolean {
    //1,2,3
    var firstIndex = list[0]//1
    list.forEachIndexed { index, i ->
        if (index > 0 && i != firstIndex + 1) {
            return false
        }
        firstIndex = i
    }
    return true
}