Compilare: main.cpp: In function 'void solve()': main.cpp:140:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (hull.size() >= size + 2) { ~~~~~~~~~~~~^~~~~~~~~~~ main.cpp:152:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < hull.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:153:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] aria += hull[i] * hull[(i + 1 == hull.size() ? 0 : i + 1)]; ~~~~~~^~~~~~~~~~~~~~ main.cpp:84:8: warning: unused variable 'p1' [-Wunused-variable] point p1, p2, p3, p4; ^~ main.cpp:84:12: warning: unused variable 'p2' [-Wunused-variable] point p1, p2, p3, p4; ^~ main.cpp:84:16: warning: unused variable 'p3' [-Wunused-variable] point p1, p2, p3, p4; ^~ main.cpp:84:20: warning: unused variable 'p4' [-Wunused-variable] point p1, p2, p3, p4; ^~