Compilare: main.cpp: In function 'void Add(int)': main.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[r].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'void Remove(int)': main.cpp:33:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[r].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int Nr(int)': main.cpp:53:1: warning: control reaches end of non-void function [-Wreturn-type] } ^