Compilare: main.cpp: In member function 'int Graph::hamilton()': main.cpp:56:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for (int k = 0; k < adj_list_costs[j].size(); k++) // Get through all the neighbours of the node | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:68:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | for (int i = 0; i < adj_list_costs[0].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:150:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 150 | for (int i = 0; i < euler_list.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~