Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:18:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:71:9: warning: unused variable ‘k’ [-Wunused-variable] int k=0,v[7501]={0}; ^ user.cpp:71:13: warning: unused variable ‘v’ [-Wunused-variable] int k=0,v[7501]={0}; ^