Compilare: user.cpp: In function ‘int main()’: user.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] FOR(i,0,X.size()-1) ^ user.cpp:10:38: note: in definition of macro ‘FOR’ #define FOR(i,a,b) for(int i = a; i<=b;i++) ^ user.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] FOR(i,0,X.size()-1) ^ user.cpp:10:38: note: in definition of macro ‘FOR’ #define FOR(i,a,b) for(int i = a; i<=b;i++) ^