Compilare: user.cpp: In function ‘int dfs(const int&, const std::vector<std::vector<int> >&, int&)’: user.cpp:26:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graph[aux].size() && !found;i++) ^ user.cpp: In function ‘int main()’: user.cpp:66:9: warning: unused variable ‘cent1’ [-Wunused-variable] int cent1=-1,cent2=-1,vf1=0,vf2=0,vaux1=0,vaux2=0,diam=0,diaux=0; ^ user.cpp:66:18: warning: unused variable ‘cent2’ [-Wunused-variable] int cent1=-1,cent2=-1,vf1=0,vf2=0,vaux1=0,vaux2=0,diam=0,diaux=0; ^ user.cpp:67:13: warning: ‘pmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] vf1=pmin; ^