Compilare: user.cpp: In function ‘int ctbU(int, int, int)’: user.cpp:31:9: warning: unused variable ‘mij’ [-Wunused-variable] int mij; ^ user.cpp: In function ‘int ctbD(int, int, int)’: user.cpp:44:9: warning: unused variable ‘mij’ [-Wunused-variable] int mij; ^ user.cpp: In function ‘long double divide(int, int)’: user.cpp:90:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i1<A.size() && i2<B.size()) ^ user.cpp:90:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i1<A.size() && i2<B.size()) ^