Q: My program gets WA/TLE/RE when compiled by GCC/G++ (C/C++), but it's AC when compiled by C/C++ (GCC/G++)!

A: It's probably caused by some minor bugs hiding in your AC code which
 have not lead to visible effects due to compiler factors. It is 
recommended that you revise your code to fix the bugs in this case. 
Another possible cause is the fact that different compilers generally use
 different methods, libraries and settings to generate executable files.
 Therefore it is possible for the executable files generated by different
 compilers to have different efficiency or even different behaviors in 
some special cases. For example, the stack size of programs compiled by
 MS-VC++ is larger than that of those compiled by GCC/G++. A program 
relying on extremely deep recursion may possibly fail if compiled by 
GCC/G++. If you strongly believe (with sufficient evidence) what you have
 encountered is caused by bugs of the compilers, please let us know.