Compilare: user.cpp: In function ‘int main()’: user.cpp:18:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,l,p,y,cos; ^ user.cpp:18:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,l,p,y,cos; ^ user.cpp:18:15: warning: unused variable ‘l’ [-Wunused-variable] int i,j,k,l,p,y,cos; ^ user.cpp: In function ‘bool bf(int)’: user.cpp:47:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[y].size();i++) ^ user.cpp:36:13: warning: unused variable ‘p’ [-Wunused-variable] int i,y,p,x; ^ user.cpp:36:15: warning: unused variable ‘x’ [-Wunused-variable] int i,y,p,x; ^