Compilare: main.cpp: In function 'std::pair<int, int> intersection(std::pair<int, int>, std::pair<int, int>, std::pair<int, int>, std::pair<int, int>)': main.cpp:69:11: warning: variable 'result' set but not used [-Wunused-but-set-variable] point result = {x , y}; ^~~~~~ main.cpp: In function 'void Poligon()': main.cpp:75:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < p1.size() - 1;++i) ~~^~~~~~~~~~~~~~~ main.cpp:80:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0;j < p2.size() && cross_product(p1[i],p1[i+1],p2[j]) < 0;++j); ~~^~~~~~~~~~~ main.cpp:82:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( j != p2.size()) ~~^~~~~~~~~~~~~ main.cpp:88:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0;j < p2.size() - 1;++j) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int calculate_area()': main.cpp:127:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < p.size() - 1;++i) ~~^~~~~~~~~~~~~~ main.cpp:131:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^