Compilare: main.cpp: In member function 'std::vector<long long int> directed_graph::run_bellman(const ll&)': main.cpp:260:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cycle_verification[node] > nodes_count) main.cpp: In member function 'std::vector<std::vector<long long int> > directed_graph::run_floyd()': main.cpp:279:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int node = 1; node <= nodes_count; node++) ~~~~~^~~~~~~~~~~~~~ main.cpp:287:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int pivot = 1; pivot <= nodes_count; pivot++) ~~~~~~^~~~~~~~~~~~~~ main.cpp:289:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= nodes_count; i++) ~~^~~~~~~~~~~~~~ main.cpp:291:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j <= nodes_count; j++) ~~^~~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:311:39: 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:312:41: 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); ^