Compilare: user.cpp: In function ‘double DI(int, int, std::vector<std::pair<int, int> >&, std::vector<std::pair<int, int> >&)’: user.cpp:48:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned i = st; i < dr; i++) ^ user.cpp:38:25: warning: unused variable ‘i’ [-Wunused-variable] int m = (st + dr)/2,i,j; ^ user.cpp:38:27: warning: unused variable ‘j’ [-Wunused-variable] int m = (st + dr)/2,i,j; ^ user.cpp:40:9: warning: unused variable ‘delta’ [-Wunused-variable] int delta = (int)(ceil(sqrt(dist))); ^