There are solutions to most questions on leetcode on GitHub as we speak.

I don’t get it. If your assessment is designed that knowing the solution ruins it then your assessing process is broken.

I’ve literally showed candidates the solution to leetcode questions and they still don’t get it. Trying to remove solutions seems like a poor use of effort imho.

How does any of these have anything to do with copyright infringement in the context of DMCA takedown? Do you even own the copyright to the alleged leaked solution?

literaly everything your assessing is programming 101. its not something that you can or should be asserting any copywrite on.

infact I would challange you to register the copywrites on your questions/answers and see exactly how far you get with that process before you even consider sending a single DMCA notice.

You’ve made a serious mistake somewhere in your reasoning. What you believe is the property of your relatively insignificant enterprise, the whole rest of the world knows damn well is not your property.

Besides, this is small potatoes. Why don’t you copyright Wikipedia, then DMCA WikiMedia, then put your copy behind a paywall.