Compilare: main.cpp: In function 'int main()': main.cpp:25:20: warning: loop variable '<structured bindings>' creates a copy from type 'const std::pair<const std::__cxx11::basic_string<char>, int>' [-Wrange-loop-construct] 25 | for(auto const [k,v]:H) | ^~~~~ main.cpp:25:20: note: use reference type to prevent copying 25 | for(auto const [k,v]:H) | ^~~~~ | &