二叉树，也就是树的一个特殊结构。在现实中，二叉树也经常被使用，比如储存一些数据。在数据结构中，二叉树作为一个特大重点内容。-Binary tree, that is, a special structure of the tree. In reality, the binary tree are often used, such as storage of some data. In the data structure, binary tree, as a large focus.

利用Fortran中自带的Pardiso库函数解决稀疏矩阵，其利用ＣＳＲ格式储存数据（附带例子）(The Pardiso library function in Fortran is used to solve the sparse matrix, which stores data in CSR format (with examples))