Compilare: user.cpp: In function ‘int bfs()’: user.cpp:30:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<v[nod].size(); k++) ^ user.cpp: In function ‘bool bf(int, int)’: user.cpp:52:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<v[nod].size(); k++) ^ user.cpp: In function ‘int main()’: user.cpp:77:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<v[n].size(); k++) ^ user.cpp:115:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); i++) ^