Compilare: user.cpp: In function ‘void proc(std::vector<std::pair<int, int> >&)’: user.cpp:94:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0); i < x->poz.size(); i++) { ^ user.cpp:95:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j(0); j < y->poz.size(); j++) { ^ user.cpp: In function ‘int main()’: user.cpp:83:41: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << best << ' ' << a + 1 << ' ' << b; ^ user.cpp:83:28: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << best << ' ' << a + 1 << ' ' << b; ^