Compilare: user.cpp: In function ‘int bfs(int)’: user.cpp:46:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[c.front()].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:78:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(int j=0; j<v[i].size();j++) ^ user.cpp: In function ‘int bfs(int)’: user.cpp:65:2: warning: control reaches end of non-void function [-Wreturn-type] } ^