LeetCode | 391. Perfect Rectangle矩形覆盖难题
GivenN axis-aligned rectangles where N > 0, determine if they all together forman exact cover of a rectangular region.Eachrectangle is represented as a bottom-left point and a top-right point. Forex
Mysql保持现有内容在后面增加内容的sql语句
此命令作用,修改数据表ff_vod,在vod_url字段内容后加入999999999。
update ff_vod set vod_url=CONCAT(vo