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FAQ Frequently Asked Questions
Q:Where is the input and the output?
A:Your program shall read input from stdin('Standard Input') and write output to stdout('Standard Output'). For example, you can use 'scanf' in C or 'cin' in C++ to read from stdin, and use 'printf' in C or 'cout' in C++ to write to stdout.

Your programs are not allowed to open and read from/write to files, you will get a "Restrict Function Call" if you try to do so. Here is a sample solution for problem 1000

Q:What is the compiler the judge is using and what are the compiler options?
A:The online judge system is running on linux. We are using GNU GCC/G++ for C/C++ compile and Free Pascal for pascal compile. The compile options are:
C: gcc foo.c -o foo -ansi -fno-asm -W -lm --static -DONLINE
C++: g++ foo.c -o foo -ansi -fno-asm -W -lm --static -DONLINE
Free Pascal(FPC): fpc -Co -Cr -Ct -Ci -DONLINE

Our compiler software version:

gcc/g++ version 3.2.3 20030502 (Red Hat Linux 3.2.3-20)

glibc 2.3.2

Free Pascal Compiler version 1.0.10 [2003/08/31] for i386

Q:Why did I get a Compile Error? It's well done!
A:There are some differences between GNU and MS-VC++, such as:

main must be declared as int, void main will end up with a Compile Error.
i is out of definition after block "for(int i=0...){...}"
itoa is not an ANSI function.
__int64 of VC is not ANSI, but you can use long long for 64-bit integer.

Q:What is the meaning of the judge's reply XXXXX?
A:Here is a list of the judge's replies and their meaning:

Accepted	OK! Your program is correct!
Presentation Error	Your output format is not exactly the same as the judge's output, although your answer to the problem is correct. Check your output for spaces, blank lines, etc against the problem output specification.
Wrong Answer	Correct solution not reached for the inputs. The inputs and outputs that we use to test the programs are not public (it is recommendable to get accustomed to a true contest dynamic).
Time Limit Exceed	Your program tried to run during too much time.
Memory Limit Exceed	Your program tried to use more memory than the judge default settings.
Restrict Function Call	Your've called the forbidden system function, such as fopen, fork, etc.
Runtime Error	Your program failed during the execution. This is often caused by divided by zero, violent memory access, etc. It is highly recommended that you should add "return 0;" at the end of the main function to avoid runtime error.
Compile Error	The compiler could not compile your program. Of course, warning messages are not error messages. Click the link at the judge reply to see the actual error message.
Output Limit Exceed	Your program tried to write too much information. This usually occurs if it goes into a infinite loop. Currently the output limit is 1M byte.
Judging	The Judge System is now judging your program. Wait for a few seconds, you will get the result.
Queuing	The Judge is so busy that it can't judge your submit at the moment, usually you just need to wait a few more seconds and your submit will be judged.
Internal Error	Unknown error occurs. This rarely happens. If you encounter this message, please contact me as soon as possible.

Fuzhou University Online Judge System
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