Compilare: main.cpp: In instantiation of 'fenwick_tree<T>::fenwick_tree(const std::vector<T>&) [with T = int]': main.cpp:74:32: required from here main.cpp:16:56: warning: narrowing conversion of '((& from_arr)->std::vector<int>::size() + 1)' from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing] 16 | tree_size{from_arr.size()}, arr{from_arr.size() + 1, 0} | ~~~~~~~~~~~~~~~~^~~ main.cpp:16:56: warning: narrowing conversion of '((& from_arr)->std::vector<int>::size() + 1)' from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing]