Compilare: main.cpp: In member function 'double Graph::prims_algorithm()': main.cpp:46:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for (int j = 1; j < nodes_positions.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:51:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for (int i = 1; i < nodes_positions.size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:57:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (int j = 0; j < nodes_positions.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:70:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Coordinate>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for (int j = 0; j < nodes_positions.size(); j++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~