Compilare: user.cpp: In member function ‘int network::path()’: user.cpp:35:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < graph[act].size() ; ++i) ^ user.cpp: In member function ‘void network::process()’: user.cpp:72:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < graph[D].size() ; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:97:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in" , "r" , stdin); ^ user.cpp:98:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out" , "w" , stdout); ^ user.cpp:100:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ user.cpp:101:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &m); ^ user.cpp:109:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &x); ^ user.cpp:110:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &y); ^ user.cpp:111:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &z); ^