AlternativeSort

AlternativeSort.kt

fun IntArray.alternateSort(): IntArray {
    require(this.isNotEmpty()) { "There must be at least one element" }

    this.sort()
    val result = mutableListOf<Int>()

    var j = this.lastIndex
    var i = 0

    while (i < j) {
        result.add(this[j--])
        result.add(this[i++])
    }

    if (size % 2 != 0) {
        result.add(this[i])
    }

    return result.toIntArray()
}

fun main(args: Array<String>) {
    val arr = intArrayOf(1, 12, 4, 6, 7, 10)
    println(arr.alternateSort().asList())
}