teamnote history merge

2024fall/source/DS/PBDS.cpp

@@ -0,0 +1,19 @@
+#include<ext/pb_ds/assoc_container.hpp>
+using namespace __gnu_pbds;
+
+template<typename T>
+using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
+
+indexed_set<int> s;
+s.insert(3); s.insert(2); s.insert(3);
+s.insert(9); s.insert(7);
+//2 3 7 9
+
+s.insert(5); //2 3 5 7 9
+s.erase(5); //2 3 7 9
+
+auto x = s.find_by_order(2); // *x : 7
+
+s.order_of_key(6) // 2
+s.order_of_key(7) // 2
+s.order_of_key(8) // 3