Compilare: user.cpp: In function ‘bool find_value(long long int, int)’: user.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<a[list].size(); ++j) ^ user.cpp: In function ‘void in_hash(int)’: user.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(m>=strlen(s[i])) return; ^ user.cpp: In function ‘void check_hash(int)’: user.cpp:79:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<a[i].size(); ++j) ^ user.cpp:74:10: warning: unused variable ‘X’ [-Wunused-variable] secv X; ^