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MissingNumber_02.java

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package misc;

/**

* Logic:-

* loop through the given array and tick marking all the numbers

* which are present by storing one of their respective indices.

*

*/

public class MissingNumber_02 {

public static void main(String[] args) {

int[] input = { 1, 1, 2, 3, 5, 5, 7, 9, 9, 9 };

int[] register = new int[input.length];

for (int i : input) {

register[i] = 1;

}

System.out.println("Missing number: ");

for (int i = 1; i < register.length; i++) {

if (register[i] == 0) {

System.out.println(i);

}

}

}

}