Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:12:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int compute(int, int)’: user.cpp:35:11: warning: statement has no effect [-Wunused-value] for(pp;pp>0;pp-=lbit(pp)) ^ user.cpp: In function ‘void update(int, int, int)’: user.cpp:56:11: warning: statement has no effect [-Wunused-value] for(pp;pp<=sz[wh];pp+=lbit(pp)) ^