Compilare: user.cpp: In function ‘int bfs(std::vector<std::pair<int, int> >, int&, int)’: user.cpp:38:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int b = 0; b < viz.size(); b++) { ~~^~~~~~~~~~~~ user.cpp: In function ‘int diam(std::vector<std::pair<int, int> >)’: user.cpp:47:11: warning: variable ‘nod2’ set but not used [-Wunused-but-set-variable] int nod1,nod2; ^~~~ user.cpp: In function ‘int bfs(std::vector<std::pair<int, int> >, int&, int)’: user.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^