Compilare: user.cpp:13:26: warning: left shift count >= width of type [enabled by default] const long long OO = (1<<60); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:42:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, f; i < V[n].size(); i++) ^ user.cpp:38:9: warning: unused variable ‘m1’ [-Wunused-variable] int m1 = 0, m2 = 0; ^ user.cpp:38:17: warning: unused variable ‘m2’ [-Wunused-variable] int m1 = 0, m2 = 0; ^