Compilare: user.cpp: In function ‘int main()’: user.cpp:16:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i=2;i<=N;i++) ^ user.cpp:19:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int j=i+i;j<=N;j+=i) ^ user.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=AA+4;i<=B;i+=4) ^ user.cpp:40:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=pp;j<=B;j+=pp) ^ user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j>=A ) ^