spoj ⟹ classical ⟹ orderset ⟹ Order statistic set

one way to solve this problem is to make your own self balancing binary tree like AVL or RedBlack tree or with a little effort you can learn GNU policy based data structures available under GCC (available under all competitive programming platforms).

GNU Policy-Based Data Structures

https://gist.github.com/6bfe47a5b8ecff7f4037

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