Question

How to find missing elements of a given range in array of distinct elements with Java

Answer 1

import java.util.HashSet;

public class MyClass {
    public static void printMissingElements(int arr[], int range_start, int range_end) {
        HashSet<Integer> hset = new HashSet<>();
        for (int i = 0; i < arr.length; i++) {
            hset.add(arr[i]);
        }
        
        for (int i = range_start; i <= range_end; i++) {
            if (!hset.contains(i)) {
                System.out.print(i + " ");
            }
        }
    }
    public static void main(String args[]) {
        int arr[] = {2, 4, 5, 7, 9};
        int range_start = 1, range_end = 9;

        printMissingElements(arr, range_start, range_end);
    }
}




/*
run:

1 3 6 8 

*/

 

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