Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[s].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:79:6: warning: unused variable ‘x’ [-Wunused-variable] int x,y; ^ user.cpp:79:8: warning: unused variable ‘y’ [-Wunused-variable] int x,y; ^