Compilare: main.cpp: In member function 'int Graph::hamilton()': main.cpp:58:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int k = 0; k < adj_list_costs[j].size(); k++) // Get through all the neighbours of the node | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:70:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for (int i = 0; i < adj_list_costs[0].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~