/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int[] arr = {2,3,4,1,1,2,4};
		findOdd(arr);
	}
	public static void findOdd(int[] arr){
		int res=0;
		for(int i=0;i<arr.length;i++){
			res= res^arr[i];
		}
		System.out.println(res+" has occurred odd no of time");
	}
}

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