Compilare: user.cpp: In instantiation of ‘size_t LinearProbing<MAX_SIZE>::h(int, size_t) const [with unsigned int MAX_SIZE = 2097152u; size_t = unsigned int]’: user.cpp:40:25: required from ‘void LinearProbing<MAX_SIZE>::insert(int) [with unsigned int MAX_SIZE = 2097152u]’ user.cpp:115:31: required from here user.cpp:30:38: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] return (hash<int>()(key) + i >> 1 + (i * i) >> 1) % MAX_SIZE; ^