import java.util.Arrays;

public class ArrayManipulation {

   
    public static int[] reverseArray(int[] arr) {

        for (int i = 0; i < arr.length/2; i++) {
            int tmp = arr[i];
            arr[i] = arr[arr.length - 1 - i];
            arr[arr.length - 1 - i] = tmp;
         }
         return arr;

    }
    public static int[] removeFirst(int[] arr) {
        int[] help = new int[arr.length - 1];
      for(int i=1; i < arr.length; i++){        //nico.schroeder@informatik.hs-fulda.de
           help[i-1] = arr[i];

        }
        return  help;
    }  
        

    public static int[] removeLast(int[] arr){
        int[] help = new int[arr.length-1];
        for(int i=0; i<arr.length-1; i++){
            help[i]=arr[i];
        }
        return help;
    }
     public static int[] squareEach(int[] arr){
        int[] square= new int[arr.length];
        for(int i= 0; i<arr.length; i++){
            square[i] = arr[i]*arr[i];
        }
        return square;
    } 
    public static void main(String[] args) {
       
        int[] arr = {1,2,3,4,5};
        System.out.println(Arrays.toString(reverseArray(arr)));
        System.out.println(Arrays.toString(squareEach(arr)));
        System.out.println(Arrays.toString(removeFirst(arr)));
        System.out.println(Arrays.toString(removeLast(arr)));
    }
}