[newSolution]Who can add 1 more problem of LeetCode 3212

[LetMeFly666]

By Github Actions | 3212.统计 X 和 Y 频数相等的子矩阵数量 | 2026-03-19

[1problem1day]

This issue was automatically added to the project.
🕒 Time (Beijing, UTC+8): 2026/3/19 00:55:40
🤖 Triggered by 1problem1day Bot according to action file

[LetMeFly666]

hello #1451 you are not alone now(/again). -- From Windows

[1problem1day]

Set the project status to In Progress based on the solving label.
🕒 Time (Beijing, UTC+8): 2026/3/19 22:10:59
🤖 Triggered by 1problem1day Bot according to action file

[1problem1day]

Set finish date = 2026-03-19 in project.
🕒 Time (Beijing, UTC+8): 2026/3/19 22:43:34
🤖 Triggered by 1problem1day Bot according to action file