Policy Based Data Structure

#1

Output
source.cpp:15:42: error: template argument 4 is invalid
15 | tree_order_statistics_node_update> PBDS2;
| ^

I can’t understand this error. Please help to debug my code

#2

@sufia.aleena12 when you are using order of key for c(i).first but why?
c is your integer array so why you doing c(i).first?

#3

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