Compilare: user.cpp: In function ‘void add(Circle)’: user.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lines.size(); j++) ~~^~~~~~~~~~~~~~ user.cpp: In function ‘void greedy(Line)’: user.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < line.intPoints.size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:95:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lines.size(); i++) ~~^~~~~~~~~~~~~~