Compilare: user.cpp: In function ‘std::vector<Point> getOctant(int, int, int)’: user.cpp:29:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < d.size(); i++) { ^ user.cpp:31:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < u.size() - 1 && u[j + 1].x + u[j + 1].y <= d[i].x + d[i].y) { ^ user.cpp: In function ‘int main()’: user.cpp:125:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("metrou4.in", "r", stdin); ^ user.cpp:126:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("metrou4.out", "w", stdout); ^ user.cpp:129:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", &testCases); testCases > 0; testCases--) { ^ user.cpp:130:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:132:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &p[i].x, &p[i].y); ^