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An array is a grouping of identically typed elements that are stored in adjacent memory locations and may each be separately referred to using an index to a special identifier.

What is an array ?

  • An array is a grouping of identically typed elements that are stored in adjacent memory locations and may each be separately referred to using an index to a special identifier. There is no need to declare five distinct variables when declaring an array of five int values (each with its own identifier).
  • Indexed arrays, multidimensional arrays, and associative arrays are the three types of arrays.

public static int solution(int[] A) {

 Set<Integer> set = new TreeSet<>();

             for (int a : A) {

           set.add(a);

       }

           int N = set.size();

        int[] C = new int[N];

          int index = 0;

           for (int a : set)

        {

           C[index++] = a;

       }

  for (int i = 0; i < N; i++) {

           if (C[i] > 0 && C[i] <= N) {

               C[i] = 0;

           }

       }

       for (int i = 0; i < N; i++) {

           if (C[i] != 0) {

               return (i + 1);

           }

       }

       return (N + 1);

   }

To learn more about array refer,

https://brainly.com/question/28061186

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