Compilare: main.cpp: In function 'int main()': main.cpp:111:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 111 | while (pos < edges.size() && edges[pos].pt1.x == edges[0].pt1.x) { | ~~~~^~~~~~~~~~~~~~ main.cpp:115:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<line>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | while (pos < edges.size() && edges[pos].pt1.x == index) { | ~~~~^~~~~~~~~~~~~~