Compilare: main.cpp: In function 'void solve()': main.cpp:116:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (hull.size() >= size + 2) { ~~~~~~~~~~~~^~~~~~~~~~~ main.cpp:128:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < hull.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:129:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] aria += hull[i] * hull[(i + 1 == hull.size() ? 0 : i + 1)]; ~~~~~~^~~~~~~~~~~~~~