Compilare: user.cpp: In function ‘int main()’: user.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<r.size();i++) ^ user.cpp:29:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,tx,ty,x,y,c,total=0; ^ user.cpp:29:13: warning: unused variable ‘tx’ [-Wunused-variable] int i,j,tx,ty,x,y,c,total=0; ^ user.cpp:29:16: warning: unused variable ‘ty’ [-Wunused-variable] int i,j,tx,ty,x,y,c,total=0; ^