Compilare: user.cpp: In function ‘bool search_in_hash(int, int)’: user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[x].size();++i) ^ user.cpp: In function ‘int search_in_tata(int, int)’: user.cpp:84:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[x].size();++i) ^ user.cpp: In function ‘void search_in_out(int, int)’: user.cpp:89:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[x].size();++i) ^ user.cpp: In function ‘int search_in_tata(int, int)’: user.cpp:86:1: warning: control reaches end of non-void function [-Wreturn-type] } ^