经典数据结构中较难的平衡二叉排序树的操作，考虑到较多同学都需要，特此上传，c++实现，需要做异质树的自行把struct改为class既可。-Classic data structures more difficult to balance binary sort tree operation, taking into account the needs of more students, and would like to upload, c++ Achieve, we need to do their own heterogeneous tree struct to class can be changed.