Compilare: user.cpp: In function ‘void AddToHash(unsigned int)’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<H[k].size(); i++) ^ user.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(H[k][i].first==x) ^ user.cpp: In function ‘long long int SearchHash(unsigned int)’: user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<H[k].size(); i++) ^ user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(H[k][i].first==x) ^ user.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^