[newSolution]Who can add 1 more problem of LeetCode 3020

[LetMeFly666]

By Github Actions | 3020.子集中元素的最大数量 | 2026-06-27

[1problem1day]

This issue was automatically added to the project.
🕒 Time (Beijing, UTC+8): 2026/6/27 01:43:07
🤖 Triggered by 1problem1day Bot according to action file

[LetMeFly666]

hello #1663 you are not alone now(/again). -- From MacOS

[1problem1day]

Set the project status to In Progress based on the solving label.
🕒 Time (Beijing, UTC+8): 2026/6/27 12:58:09
🤖 Triggered by 1problem1day Bot according to action file