Question

How to cyclically rotate the elements of int array right by one in Kotlin

Answer 1

fun rotateRightByOne(arr: IntArray): IntArray {
    if (arr.isEmpty()) return arr

    val lastElement = arr.last()
    for (i in arr.size - 1 downTo 1) {
        arr[i] = arr[i - 1]
    }
    arr[0] = lastElement
    
    return arr
}

fun main() {
    val arr = intArrayOf(4, 7, 2, 9, 3)
    
    val rotatedArray = rotateRightByOne(arr)
    
    println(rotatedArray.joinToString())
}
 

 
/*
run:

3, 4, 7, 2, 9
 
*/

 

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