Compilare: main.cpp: In member function 'double Graph::prims_algorithm()': main.cpp:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 60 | for (int j = 1; j < coordinates.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:65:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for (int i = 1; i < coordinates.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:71:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for (int j = 0; j < coordinates.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:84:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for (int j = 0; j < coordinates.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~