Compilare: user.cpp: In function ‘long long unsigned int pw(long long unsigned int, long long unsigned int)’: user.cpp:16:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( unsigned long long i = 0; ( 1LL << i ) <= p; ++i ) ^ user.cpp: In function ‘int main()’: user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 1; i <= min( N, P ); ++i ) ^