Compilare: main.cpp: In function 'll recur(std::vector<point>, std::vector<point>)': main.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i < px.size()-1; ++i){ ~~^~~~~~~~~~~~~ main.cpp:44:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j =i + 1; j < px.size(); ++j) ~~^~~~~~~~~~~ main.cpp:57:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i =0; i < px.size(); ++i) ~~^~~~~~~~~~~ main.cpp:66:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i =0; i < py.size(); ++i) ~~^~~~~~~~~~~ main.cpp:69:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(p.x <= xl && sty.size() < median) ~~~~~~~~~~~^~~~~~~~ main.cpp:76:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i =0; i < py.size(); ++i) ~~^~~~~~~~~~~ main.cpp:82:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i =0; i < s.size(); ++i){ ~~^~~~~~~~~~ main.cpp:84:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i + 1; j < s.size() ; ++j) ~~^~~~~~~~~~