USACO Platinum 2017 January - Promotion Counting

Merging Indexed Sets

1#include <bits/stdc++.h>
2#include <ext/pb_ds/tree_policy.hpp>
3#include <ext/pb_ds/assoc_container.hpp>
4
5using namespace std;
6using namespace __gnu_pbds;
7
8template<class T> using Tree = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
9
10const int MX = 1e5+5;