What is inverse of an array

#1

in question it says to use recursive function but recusion is not taught yet

#2

Inverse is Simply swapping the value of the array with the value at that index.

Algo

  1. Create a new Array say narr and original array is arr.
  2. now at the arr[i]th index of narr save the ith value.(previously i is the index and arr[i] is the value bt now arr[i] is the index and i is the value.)
  3. return new array.

Code

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

        int[] narr = new int[arr.length];

        for(int i = 0;i < arr.length;i++){

            narr[arr[i]] = i;
        }

        return narr;
    }
#3

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