What is the different between GNU C++5,GNUC++11,GNU C++14,ANSI c compilers?

Question

In programming contest,i see these 4 types c/c++ compilers.
i wonder a lot of time seeing that if i submit to GNU C++11 my submitted solution is accepted but if i use GNU C++14 i used to get run time error or wrong answer.
so how can i decide which compiler is good for me?
and what is the difference between those?

Answer 1

C++11 and C++14 are two versions of the language C++ (respectively for 2011 and 2014)
You can find their differences on cppreference
GNU is a version of C++ that adds some features to the language

I do not know why it happens to you and can't guess without the code, sorry