Compilare: user.cpp: In function ‘bool find(int)’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<H[X%MOD].size();++j) ^ user.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (H[X%MOD][j]==X) ^ user.cpp: In function ‘unsigned int function(unsigned int)’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^