qq_26973089的博客

In this problem, a rooted tree is a directed graph such that, there is exactly one node (the root) for which all other nodes are descendants of this node, plus every node has exactly one parent, excep...

A Range Module is a module that tracks ranges of numbers. Your task is to design and implement the following interfaces in an efficient manner.addRange(int left, int right) Adds the half-open interva...