C онлайн компилятор
//Great online compiler for c++ what I recommend
https://www.onlinegdb.com/online_c++_compiler
KeWols
//Great online compiler for c++ what I recommend
https://www.onlinegdb.com/online_c++_compiler
template < class T, class Alloc = allocator<T> > class vector; // generic template
Three good online compilers:
https://www.onlinegdb.com/online_c++_compiler
https://www.programiz.com/cpp-programming/online-compiler/
http://cpp.sh/
onlinegdb.com/online_c++_compiler
code.cs50.io