Compilare: user.cpp: In function ‘int main()’: user.cpp:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i<=N; i++) ^ user.cpp:26:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=N;i++) { ^ user.cpp: In function ‘long long unsigned int lcm(long long unsigned int, long long unsigned int)’: user.cpp:54:21: warning: variable ‘d’ set but not used [-Wunused-but-set-variable] unsigned long long d; ^