Note 1: This is not the official editorial. I prepared these solutions while testing the problems as a tester before the contest.

Note 2: The video tutorial is for those who prefer learning from videos and want to see implementation tips alongside the problem explanations.

Watch the full video: Video Link

Please let me know how you prefer this kind of problem-solving video.

• A premier video, but you can’t jump to a specific problem until the video has ended.

• A regular video without a chatbox (like this one).