Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:38:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int Ans(int, int)’: user.cpp:80:8: warning: unused variable ‘i’ [-Wunused-variable] { int i,p1,p2,res=0; ^ user.cpp: In function ‘int Upd(int, int)’: user.cpp:107:2: warning: no return statement in function returning non-void [-Wreturn-type] } ^