I was trying to search for Range queries problems for practice and I found that CF problemset doesn't have "Range Query" tag.

Problemset has tags like:

• schedules — It has just 5 problems
• chinese remainder theorem — It has 12 problems

And few others which are too specific or rare like meet in middle, expression parsing.

I don't understand why these topics have tag but range query doesn't. Is there any specific reason behind it?