This userscript is intended for students of Tsinghua University to mark time confliction when they are selecting courses.
As of now, the conflicted course time is hard to determine as it requires mental effort to remember all the selected courses. When you are browsing a list of courses, this would greatly slow down your speed.
With this script, the conflicted time is marked in red, hence it is easy to skip and filter.
This script only applies in the selecting course web page. As for in course information pages, it is of no use.
Also, the half-term courses are not considered for now. We only mark possible time confliction. The real confliction should be determined by the user. Improvement/pull request is encouraged.
THERE IS NO WARRENTY FOR THE SCRIPT.