Compilare: main.cpp: In instantiation of 'void hashtable<from>::erase(from) [with from = int]': main.cpp:66:17: required from here main.cpp:41:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int, std::allocator<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | if (pos2 != vec[pos].size() - 1) { | ~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In instantiation of 'int hashtable<from>::hash(from) [with from = int]': main.cpp:32:13: required from 'void hashtable<from>::insert(from) [with from = int]' main.cpp:63:18: required from here main.cpp:13:29: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare] 13 | for (int index = 0; index < sizeof(key); index++) { | ~~~~~~^~~~~~~~~~~~~ main.cpp: In instantiation of 'int hashtable<from>::search(from, int) [with from = int]': main.cpp:33:7: required from 'void hashtable<from>::insert(from) [with from = int]' main.cpp:63:18: required from here main.cpp:23:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int, std::allocator<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for (int index = 0; index < vec[pos].size(); index++) { | ~~~~~~^~~~~~~~~~~~~~~~~