Compilare: user.cpp: In member function ‘void points_set::killPoints(sq)’: user.cpp:32:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m_points.size(); ++i) ^ user.cpp: In member function ‘bool points_set::coveredByTwoSquares(sq, sq)’: user.cpp:37:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m_points.size(); ++i) ^ user.cpp: In member function ‘void points_set::reset()’: user.cpp:43:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m_points.size(); ++i) ^ user.cpp: In member function ‘void points_set::getBoundingBox()’: user.cpp:49:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m_points.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:90:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.in", "r", stdin); ^ user.cpp:91:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("patrate.out", "w", stdout); ^ user.cpp:94:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:97:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &foo.x, &foo.y); ^