Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:80:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "naveplanare.in" , "r", stdin ); ^ user.cpp:81:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "naveplanare.out", "w", stdout ); ^ user.cpp:83:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &nr_nodes, &edge_capacity ); ^ user.cpp:87:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &my_vector[i].x, &my_vector[i].y ); ^