arrays_left_rotation.go

package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

func main() {

	var n, d, index int

	if _, err := fmt.Scan(&n, &d); err == nil {
		if n >= 1 && n <= int(math.Pow(10, 5)) && d >= 1 && d <= n {
			intergers := make([][]byte, n, n)
			line := bufio.NewReader(os.Stdin)
			nums, _ := line.ReadSlice('\n')

			// Removes line feed character (10).
			nums = nums[:len(nums)-1]

			for _, num := range nums {
				if num != 32 {
					intergers[index] = append(intergers[index], num)
				} else {
					index++
				}
			}

			for i := 1; i <= d; i++ {
				var n []byte
				n = intergers[0]
				intergers = append(intergers[:0], intergers[1:]...)
				intergers = append(intergers, n)
			}

			for delta, interger := range intergers {
				if s, err := strconv.Atoi(string(interger)); err == nil {
					if delta != len(intergers)-1 {
						fmt.Printf("%v ", s)
					} else {
						fmt.Printf("%v\n", s)
					}
				}
			}
		} else {
			fmt.Println("?")
		}
	}
}