Compilare: user.cpp: In function ‘void BFS(unsigned int)’: user.cpp:30:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!visited[graph[element][i]] && p != graph[element][i]) ^ user.cpp: In function ‘int main()’: user.cpp:50:32: 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); ^ user.cpp:51:34: 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); ^