Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:31:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = k; i<fn.size(); i+=i&-i) ~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:92:17: warning: unused variable ‘x’ [-Wunused-variable] int x = get<0>(t), p = get<1>(t); ^