left rotation

package main
import "fmt"

func reverse(num []int, start, end int) {
    for start < end {
        var t = num[start]
        num[start] = num[end]
        num[end] = t
        start++
        end--
    }
}
func main() {
 //Enter your code here. Read input from STDIN. Print output to STDOUT
        var num, n int
    fmt.Scanln(&num, &n)
    arr := make([]int, 0, num)
    for i := 0; i < num; i++ {
        var d int
        fmt.Scanf("%d", &d)
        arr = append(arr, d)
    }
    n = n % num
    reverse(arr, 0, n-1)
    reverse(arr, n, num-1)
    reverse(arr, 0, num-1)
    for i := 0; i < num; i++ {
        fmt.Printf("%d ", arr[i])
    }
    fmt.Println()
}