the tags in the problemset of codeforces have tags on their problems but out of 10 ques ,let's say only 1 or 2 have actual use of that topic and the editorials do not provide the alternate solutions using those tags. most of the problems are just greedy or implementation based. Like i wanted to practice for dp tags so out of 30 ques i did ,i found only 3 ques of actual dp involved in it. i request codeforces to either put only those tags which are actially used or provide alternate solutions using those tags :(