Compilare: user.cpp: In function ‘long long int MaxArea()’: user.cpp:100:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j + 1 >= Pi.size() || Pi[j + 1].x != Pi[j].x) ^ user.cpp:104:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i2 + 1 >= Pj.size() || Pj[i2 + 1].y != Pj[i2].y) ^ user.cpp:108:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j2 + 1 >= Pi.size() || Pi[j2 + 1] != Pj[i2 + 1]) ^ user.cpp: In function ‘bool Check(Point, Point)’: user.cpp:143:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = p0; i < P[g].size() && P[g][i] < p2; ++i) ^ user.cpp: In function ‘int BinarySearch(Point, std::vector<Point>&, char)’: user.cpp:159:26: warning: narrowing conversion of ‘((& P)->std::vector<_Tp, _Alloc>::size<Point, std::allocator<Point> >() + 4294967295u)’ from ‘std::vector<Point>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] int l{0}, r{P.size() - 1}, mid; ^