Hello Codeforces community!
Today, I found a new function on Codeforces, it looks like the file comparing. As you can see, when you are viewing a submission details, a new button "Compare" appears:
I think this function is useful. For example, you solved a problem long time ago, and now you forgot the solution! You look at your accepted code to see how to solve it. You have made two submissions, one correct, one incorrect. With "Compare" funcion, you can easily find the mistakes in your incorrect submission. Therefore, you can determine the reason of your mistakes (a small bug in coding, or a tricky test case).
I hope my discovery will have you a lot! Thank you for reading it.