Submit your code in a .zip, .rar, or .tar file.
Please compress source code directlt rather than compress the folder containing the code.

Please name your source file as hw7.c, and submit to both HW7 and HW7-Memory-Check. We will test your memory leak and undefined behavior in HW7-Memory-Check. Note that, HW7-Memory-Check will share the same grading cases with HW7, but only releases a trivial case as pretest. You should check your memory leak and undefined behavior by yourself. The memory check test will take 20% marks, i.e. you may lose 20% marks if you get all the correct answers but with memory leaks.