Compilare: user.cpp: In function ‘int main()’: user.cpp:28:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp:10:20: warning: unused variable ‘x1’ [-Wunused-variable] long int x,m,n,x1,y1,e,b,c,y,i,k=0,j; ^ user.cpp:10:30: warning: unused variable ‘c’ [-Wunused-variable] long int x,m,n,x1,y1,e,b,c,y,i,k=0,j; ^ user.cpp:10:40: warning: unused variable ‘j’ [-Wunused-variable] long int x,m,n,x1,y1,e,b,c,y,i,k=0,j; ^