1993A — Question Marks
Video
1993B — Parity and Sum
Video
1993C — Light Switches
Video
1993D — Med-imize
Video
1993E — Xor-Grid Problem
Video
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WorldQuant Round 1 (Codeforces Round 1128, Div. 1 + Div. 2)
39:01:59
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Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
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Время на сервере: 16.10.2026 02:33:02 (g2).
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wrong video isnt it?
Shayan
It is supposed to be the solution discussion of Codeforces Round 963. Did I mistakenly add another video somewhere?
Problem names/links are from other contest
Oh, you are right. Thanks.
Ig only the titles are misplaced.
Thanks. Fixed.
Is there a container that always maintains the elements in sorted order, allows me to access any k-th largest/smallest element in O(log n) complexity, and also supports insertion and deletion of elements in O(log n) complexity? THANKS~~
i think you are looking for this.
COOL
but be careful, orderd set is not exactly O(log(n)) but O(log(n) * constant) and this constant may cause a time limit (rarely).
oh i know，thanks
you can do it with compression and fenwick/segment tree.
thanks！