Compilare: user.cpp: In function ‘int bf()’: user.cpp:23:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vc[crt].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:52:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<vc[N].size(); i++) ^ user.cpp:67:27: warning: ‘min_flux’ may be used uninitialized in this function [-Wmaybe-uninitialized] flux+=min_flux; ^