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Yea, I think you basically do need one of these: https://en.wikipedia.org/wiki/Order_statistic_tree https://en.wikipedia.org/wiki/Order_statistic_tree They're

by Felz 7y ago

Yea, I think you basically do need one of these: https://en.wikipedia.org/wiki/Order_statistic_tree https://en.wikipedia.org/wiki/Order_statistic_tree They're somewhat obscure though.