/* 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   [] nums = {1,2};
 
		System.out.println(isDuplicateElePresent(nums));
		// your code goes here
	}
	static	boolean  isDuplicateElePresent(int [] nums){
		Set<Integer> set = new HashSet<>();
		for(int x: nums){
			if(!set.add(x)){
				return true;
			}
		}
		return false;
	}
}

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