Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:35:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:97:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<px.size();i++) ^ user.cpp:72:13: warning: unused variable ‘sol’ [-Wunused-variable] { int i,j,d,sol=0; ^