Compilare: user.cpp: In function ‘int main()’: user.cpp:31:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (radical*radical + radical >= N && radical * radical != N) ^ user.cpp:31:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (radical*radical + radical >= N && radical * radical != N) ^ user.cpp:33:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (radical*radical + radical<N) ^