Compilare: user.cpp: In function ‘void insertion(int)’: user.cpp:16:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[key].size();++i) ^ user.cpp: In function ‘void termination(int)’: user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[key].size();++i) ^ user.cpp: In function ‘int searching(int)’: user.cpp:40:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h[key].size();++i) ^