Compilare: user.cpp: In member function ‘size_t celula_hash::operator()(const std::pair<int, int>&) const’: user.cpp:35:37: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] return (hash<int>()(n.first)<<4 + 23) ^ (hash<int>()(n.second)>>1 + 13); } }; ^ user.cpp:35:71: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] return (hash<int>()(n.first)<<4 + 23) ^ (hash<int>()(n.second)>>1 + 13); } }; ^