Compilare: user.cpp: In function ‘int main()’: user.cpp:46:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:28:15: warning: unused variable ‘x1’ [-Wunused-variable] int x,m,n,x1,y1,e,b,c,y,i,k=0,j; ^ user.cpp:28:18: warning: unused variable ‘y1’ [-Wunused-variable] int x,m,n,x1,y1,e,b,c,y,i,k=0,j; ^ user.cpp:28:35: warning: unused variable ‘j’ [-Wunused-variable] int x,m,n,x1,y1,e,b,c,y,i,k=0,j; ^