Compilare: user.cpp: In function ‘int query(int, int)’: user.cpp:45:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (p < vert[x].size() && y <= vert[x][p].second.maxy()) return 1; ^ user.cpp: In function ‘int main()’: user.cpp:84:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < unic_x.size(); ++i) { ^ user.cpp:87:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s.size(); ++j) if (intersect(*fp, s[j])) { ^ user.cpp:61:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poligon.in", "r", stdin); ^