Compilare: user.cpp: In function ‘int bfs()’: user.cpp:57:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[virf].size() ; ++i){ ^ user.cpp: In function ‘void solve()’: user.cpp:105:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sol.size() != sz_min){ ^ user.cpp:107:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol.size() ; ++i) ^ user.cpp:115:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v[ind].size() ; ++i) ^ user.cpp:115:41: warning: ‘ind’ may be used uninitialized in this function [-Wmaybe-uninitialized]