duplicate elements DSA java

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import java.util.;
/
4
1 2 3 1

true , false
if duplicate true otherwise false;

*/
public class Main {
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
int n = sc.nextInt();
int ans = 0;
int [] arr= new int[n];
for(int i=0; i<n; i++){
arr[i] = sc.nextInt();
}
// skip 1st elements then check second duplicate elements

    for(int i=0; i<n; i++){
      for(int j=i+1; j<n; j++){
        // if(i==j){
        //   continue;
        // }
        if(arr[i]==arr[j]){
      // System.out.print(true);
      ans = 1;
      
        }
        
      }
    }
    
    if(ans == 1){
      System.out.print(true);
    }else{
      System.out.print(false);
    }

}

}