Compilare: user.cpp: In member function ‘void MaxFlow::reset()’: user.cpp:33:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m_edges.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:127:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algola.in", "r", stdin); ^ user.cpp:128:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algola.out", "w", stdout); ^ user.cpp:133:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:135:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &people[i]); ^ user.cpp:140:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &xx, &yy, &cc); ^