Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:17:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[start].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:66:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok=bfs(); ^