The concept is to find the numbers in two arrays that do not repeat in both. If you’re comparing more than 2 arrays, you compare the next array (and beyond) to the result of the last comparison.
We find ourselves confronted with people who are better than us at something and we convince ourselves it’s because they have an innate talent we don’t have. Usually it’s just that they’ve had more exposure, more practice, and often more interest. But because we convince ourselves mastery of that thing boils down to talent, rather than hard work, we start to believe that we can’t master it.
I am not “virtue signaling” when I do these things or demanding others follow my example. I am trying to follow an ethical concept of treating others the way I’d like to be treated. I know “do unto others as you would have them do unto you” is a radical, new-agey, liberal snowflake philosophy. And do you know which liberal snowflake is most famous for saying it?