Answers for "which c++ compiler should i use"

online c++ compiler

template < class T, class Alloc = allocator<T> > class vector; // generic template

online compiler cpp

Good cpp compilers:
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replit.com/languages/cpp
www.w3schools.com/cpp/trycpp.asp?filename=demo_helloworld
onlinegdb.com/online_c++_compiler
programiz.com/cpp-programming/online-complier
cpp.sh

online compiler cpp

cpp.sh