Find unique number form the array

#include
using namespace std;
int main() {
int n;
int ans=0;
cin>>n;
int arr[n];
for(int i=0;i<n;i++){
cin>>arr[i];
}
for(int i=0;i<n;i++){
ans=ans^arr[i];
}
cout<<ans;

return 0;

}

my code give wrong output


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