This is the final assignment for Computer Programming, 2014 in USTC.

More info

• run the program without argument will get an usage info.

• These characters are considered to delimit words:

,;:()[]{}<>/|`\"@#$%^&*_+=<space><newline><tab>

Note: hyphen are NOT considered to be same as a space!

• Binary search tree is used instead of linked lists to improve performance.

• PART3, No.1 is on branch PART3.1