Lets say there is initially an empty array and we have to preform Q number of queries of 3 types :-

1. x, add x in the array.

2. x, delete one occurrence of x from the array if exists.

3. L R, print the count of integers present in the array in the range [L, R].

*Constraints :-*

- 1 <= Q <= 1e5

- L <= R

- 1 <= x, L, R <= 1e5 (small)

- 1 <= x, L, R <= 1e9 (large)

One solution that came to my mind for small constraints is to use segment tree on the range [1,1e5] with time complexity O(Q*log(1e5)) with space complexity of O(1e5). But that solution wouldn't work for large constraints.

Is there another way to solve this problem which doesn't use segtree ? Can we use c++ STL here ? Please suggest your techniques.

**Also another variation to the same problem can be :-**

Lets say there is initially an empty array and we have to preform Q number of queries of 3 types :-

1. x, add x in the array.

2. x, delete one occurrence of x from the array if exists.

3. x, print the count of integers present in the array greater/smaller than x.