Compilare: user.cpp: In function ‘int main()’: user.cpp:28:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=2;i<=N;i++) ^ user.cpp:36:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=N;i++) ^ user.cpp:41:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<bucket[i].size();j++) ^ user.cpp:46:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=N;i+=10) ^