Compilare: main.cpp: In function 'int main()': main.cpp:146:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 146 | while (pos < edges.size() && edges[pos].pt1.x == edges[0].pt1.x) { | ~~~~^~~~~~~~~~~~~~ main.cpp:150:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 150 | while (pos < edges.size() && edges[pos].pt1.x == index) { | ~~~~^~~~~~~~~~~~~~