Compilare: user.cpp: In function ‘void normalize()’: user.cpp:6:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define For(i, x, y) for(int i = x; i <= y; ++i) ^ user.cpp:30:3: note: in expansion of macro ‘For’ For(i, 1, v.size() - 1) ^ user.cpp:6:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define For(i, x, y) for(int i = x; i <= y; ++i) ^ user.cpp:32:3: note: in expansion of macro ‘For’ For(i, 1, v.size() - 1) ^