Compilare: user.cpp: In function ‘void hull()’: user.cpp:53:88: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(v[norm[i]].first < v[norm[1]].first || v[norm[i]].first == v[norm[1]].first && ^ user.cpp: In function ‘int next(int, int, int)’: user.cpp:102:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i < cover[at + del].size() ; --i) ^ user.cpp: In function ‘int adv(int, int, int)’: user.cpp:113:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(now >= cover[at].size()) ^