Compilare: user.cpp: In function ‘int bfs(int, int&)’: user.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < arb[element].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:53:16: warning: variable ‘second’ set but not used [-Wunused-but-set-variable] int max,first,second; ^ user.cpp: In function ‘int bfs(int, int&)’: user.cpp:19:6: warning: ‘element’ may be used uninitialized in this function [-Wmaybe-uninitialized] int element; ^