Compilare: main.cpp: In member function 'int Graph::hamilton()': main.cpp:163:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 163 | for (int k = 0; k < adj_list_costs[j].size(); k++) // Get through all the neighbours of the node | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:175:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 175 | for (int i = 0; i < adj_list_costs[0].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~