Compilare: main.cpp: In constructor 'graph::graph()': main.cpp:15:10: warning: 'graph::created' will be initialized after [-Wreorder] bool created, unidirected, *visited; ^~~~~~~ main.cpp:13:23: warning: 'std::vector<unsigned int>* graph::g' [-Wreorder] std::vector<uint>*g; ^ main.cpp:49:5: warning: when initialized here [-Wreorder] graph():created(false), g(nullptr), visited(nullptr) {} ^~~~~ main.cpp: In function 'int main()': main.cpp:108:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.in","r",stdin); ^ main.cpp:109:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out","w",stdout); ^ main.cpp:111:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&m,&start); ^ main.cpp:116:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^