Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency. This cheat sheet summarizes commonly used Git command line instructions for quick reference.

农历有时候还是需要滴～

The binary heap is a data structure, in which the keys are store in an array such that each key is guaranteed to be larger than (or equal to) the keys at two other specific positions. In turn, each of those keys must be larger than (or equal to) two additional keys, and so forth. This ordering is easy to see if we view the keys as being in a binary tree structure with edges from each key to the two keys known to be smaller.

Sorting plays a major role in commercial data processing and in modern scientific computing. Here, we consider several classical sorting methods.

Memory usage is well-defined for Java on your computer that every value requires precisely the same amount of memory each time that you run your program. But Java is implemented on a very wide range of computational devices, and memory consumption is implementation-dependent. So, following is some *typical* values that subject to machine dependencies.