Compilare: main.cpp: In member function 'std::vector<int> directed_graph::run_bellman(const int&)': main.cpp:260:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cycle_verification[node] > nodes_count) main.cpp: In function 'int32_t main()': main.cpp:284:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in", "r", stdin); ^ main.cpp:285:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.out", "w", stdout); ^