Compilare: main.cpp: In instantiation of 'void bit<T>::update(int, int, int) [with T = node2]': main.cpp:135:41: required from here main.cpp:58:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos; i < arr.size(); i+= (i & -i)) { main.cpp:66:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < arr.size(); i++) { main.cpp:69:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < arr.size(); i++){