isn't sortedcontainers not allowed in codeforces?
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Assuming you are talking about C++, I'm wondering how did you become an expert without using maps/sets even once. Strange :O
i am talking about python. Sortedcontainers are in python only:|
normal sets are not sorted in python.
Sorted Containers is an open-source project which can be installed as a separate package. Talking of Codeforces, no you cannot use it here. You may use heapq for that. If you want to compare objects then you need to define a separate comparator function for that purpose.