Compilare: main.cpp: In member function 'double Graph::prims_algorithm()': main.cpp:42:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (int j = 1; j < nodes_positions.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:47:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for (int i = 1; i < nodes_positions.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:53:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for (int j = 0; j < nodes_positions.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:66:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int j = 0; j < nodes_positions.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~