Compilare: user.cpp: In function ‘void df()’: user.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[x].size();j++) ^ user.cpp:17:29: warning: unused variable ‘i’ [-Wunused-variable] int pi,ps,coada[250002],i,j,l,x; ^ user.cpp: In function ‘int main()’: user.cpp:51:21: warning: unused variable ‘cx’ [-Wunused-variable] int n,m,k,p,x,y,cx,xp; ^ user.cpp:51:24: warning: unused variable ‘xp’ [-Wunused-variable] int n,m,k,p,x,y,cx,xp; ^