Hello everyone,

Recently I was trying to implement a working persistent segment tree, and I managed to solve couple problems with it.

However for one problem I needed to implement persistent segment tree with $$$100000$$$ values in the leafs, and two long long values in each node while the memory limit is only $$$64$$$ megabytes. Firstly I created version that works with pointers, however later I replaced the pointers with integers representing each node, but neither of those version is not working in the memory limit.

What is the best way to implement such tree, are there any tricks to reduce the memory usage?