Hello, I have recently got haunted by telling the size of memory pool of persistent segment tree, getting WA / RE / MLE results on many problems. Therefore, I'd appreciate it if someone could give me a implementation of persistent segtree applying std::vector to manage the memory (in order to avoid getting WA / RE / MLE by telling wrongly the size of arrays), which I could not find one anywhere on the Internet.

If the code could be laconic as well, it would be better.

Thank you!