uva12412

maksyuki 发表于 oj 分类,标签:
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Hi, I am an undergraduate student in institute of foreign languages. As you know, C programming is a required course in our university, even if his/her major is far from computer science. I don't like this course at all, as I am not good at computer and I don't wanna even have a try of any programming!! But I have to do the homework in order to pass 🙁 Sh... Could you help me with it? Please keep secret!! I know that you won't say NO to a poor little girl, boy. 🙂

Task

Write a Student Performance Management System (SPMS).

Concepts

In the SPMS, there will be at most 100 students, each has an SID, a CID, a name and four scores (Chinese, Mathematics, English and Programming).

  • SID (student ID) is a 10-digit number
  • CID (class ID) is a positive integer not greater than 20.
  • Name is a string of no more than 10 letters and digits, beginning with a capital letter. Note that a name cannot contain space characters inside.
  • Each score is a non-negative integer not greater than 100.

Main Menu

When you enter the SPMS, the main menu should be shown like this:

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

Adding a Student

If you choose 1 from the main menu, the following message should be printed on the screen:

Please enter the SID, CID, name and four scores. Enter 0 to finish.

Then your program should wait for user input. The input lines are always valid (no invalid SID, CID, or name, exactly four scores etc), but the SID may already exist. In that case, simply ignore this line and print the following:

Duplicated SID.

On the other hand, multiple students can have the same name. You should keep printing the message above until the user inputs a single zero. After that the main menu is printed again.

Removing a Student

If you choose 2 from the main menu, the following message should be printed on the screen:

Please enter SID or name. Enter 0 to finish.

Then your program should wait for user input, and remove all the students matching the SID or name in the database, and print the following message (it's possible xx=0):

xx student(s) removed.

You should keep printing the message above until the user inputs a single zero. After that the main menu is printed again.

Querying Students

If you choose 3 from the main menu, the following message should be printed on the screen:

Please enter SID or name. Enter 0 to finish.

Then your program should wait for user input. If no student matches the SID or name, simply do nothing, otherwise print out all the matching students, in the same order they're added to the database. The format is similar to the input format for "adding a student", but 3 more columns are added: rank (1st column), total score and average score (last two columns). The student with highest total score (considering all classes) received rank-1, and if there are two rank-2 students, the next one would be rank-4. You should keep printing the message above until the user inputs a single zero. After that the main menu is printed again.

Showing the Ranklist

If you choose 4 from the main menu, the following message should be printed on the screen:

Showing the ranklist hurts students' self-esteem. Don't do that.

Then the main menu is printed again.

Showing Statistics

If you choose 5 from the main menu, show the statistics, in the following format:

Please enter class ID, 0 for the whole statistics.

When a class ID is entered, print the following statistics. Note that "passed" means to have a score of at least 60.

Chinese

Average Score: xx.xx

Number of passed students: xx

Number of failed students: xx

 

Mathematics

Average Score: xx.xx

Number of passed students: xx

Number of failed students: xx

 

English

Average Score: xx.xx

Number of passed students: xx

Number of failed students: xx

 

Programming

Average Score: xx.xx

Number of passed students: xx

Number of failed students: xx

 

Overall:

Number of students who passed all subjects: xx

Number of students who passed 3 or more subjects: xx

Number of students who passed 2 or more subjects: xx

Number of students who passed 1 or more subjects: xx

Number of students who failed all subjects: xx

Then, the main menu is printed again.

Exiting SPMS

If you choose 0 from the main menu, the program should terminate. Note that course scores and total score should be formatted as integers, but average scores should be formatted as a real number with exactly two digits after the decimal point.

Input

There will be a single test case, ending with a zero entered in the main menu screen. The entire input will be valid. The size of input does not exceed 10KB.

Output

Print out everything as stated in the problem description. You should be able to play around this little program in your machine, with a keyboard and a screen. However, both the input and output may look silly when they're not mixed, as in the keyboard-screen case.

Sample Input

1

0011223344 1 John 79 98 91 100

0022334455 1 Tom 59 72 60 81

0011223344 2 Alice 100 100 100 100

2423475629 2 John 60 80 30 99

0

3

0022334455

John

0

5

1

2

0011223344

0

5

0

4

0

Output for the Sample Input

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

Please enter the SID, CID, name and four scores. Enter 0 to finish.

Please enter the SID, CID, name and four scores. Enter 0 to finish.

Please enter the SID, CID, name and four scores. Enter 0 to finish.

Duplicated SID.

Please enter the SID, CID, name and four scores. Enter 0 to finish.

Please enter the SID, CID, name and four scores. Enter 0 to finish.

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

Please enter SID or name. Enter 0 to finish.

2 0022334455 1 Tom 59 72 60 81 272 68.00

Please enter SID or name. Enter 0 to finish.

1 0011223344 1 John 79 98 91 100 368 92.00

3 2423475629 2 John 60 80 30 99 269 67.25

Please enter SID or name. Enter 0 to finish.

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

Please enter class ID, 0 for the whole statistics.

Chinese

Average Score: 69.00

Number of passed students: 1

Number of failed students: 1

 

Mathematics

Average Score: 85.00

Number of passed students: 2

Number of failed students: 0

 

English

Average Score: 75.50

Number of passed students: 2

Number of failed students: 0

 

Programming

Average Score: 90.50

Number of passed students: 2

Number of failed students: 0

 

Overall:

Number of students who passed all subjects: 1

Number of students who passed 3 or more subjects: 2

Number of students who passed 2 or more subjects: 2

Number of students who passed 1 or more subjects: 2

Number of students who failed all subjects: 0

 

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

Please enter SID or name. Enter 0 to finish.

1 student(s) removed.

Please enter SID or name. Enter 0 to finish.

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

Please enter class ID, 0 for the whole statistics.

Chinese

Average Score: 59.50

Number of passed students: 1

Number of failed students: 1

 

Mathematics

Average Score: 76.00

Number of passed students: 2

Number of failed students: 0

 

English

Average Score: 45.00

Number of passed students: 1

Number of failed students: 1

 

Programming

Average Score: 90.00

Number of passed students: 2

Number of failed students: 0

 

Overall:

Number of students who passed all subjects: 0

Number of students who passed 3 or more subjects: 2

Number of students who passed 2 or more subjects: 2

Number of students who passed 1 or more subjects: 2

Number of students who failed all subjects: 0

 

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

Showing the ranklist hurts students' self-esteem. Don't do that.

Welcome to Student Performance Management System (SPMS).

 

1 - Add

2 - Remove

3 - Query

4 - Show ranking

5 - Show Statistics

0 - Exit

 

题目类型:复杂模拟题

算法分析:这是一道直叙式模拟题,但是由于要考察的要素很多,所以处理起来比较复杂。对于该问题,只有自顶至下,逐步求精,逐步测试来进行编程。注意数据中存在精度坑点,在判断浮点数关系时使用EPS,否则达不到精度会WA