19 lines
440 B
C++
19 lines
440 B
C++
#include<ext/pb_ds/assoc_container.hpp>
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using namespace __gnu_pbds;
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template<typename T>
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using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
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indexed_set<int> s;
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s.insert(3); s.insert(2); s.insert(3);
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s.insert(9); s.insert(7);
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//2 3 7 9
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s.insert(5); //2 3 5 7 9
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s.erase(5); //2 3 7 9
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auto x = s.find_by_order(2); // *x : 7
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s.order_of_key(6) // 2
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s.order_of_key(7) // 2
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s.order_of_key(8) // 3
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