Compilare: main.cpp: In member function 'void Flow::printEdges(std::ofstream&)': main.cpp:116:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Flow::Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 116 | for(int i = 0; i < edges.size(); i += 2) | ~~^~~~~~~~~~~~~~