Compilare: user.cpp: In function ‘int main()’: user.cpp:28:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < V.size() - 1; i++) ^ user.cpp:38:28: warning: format ‘%lf’ expects argument of type ‘double’, but argument 2 has type ‘__gnu_cxx::__alloc_traits<std::allocator<long double> >::value_type {aka long double}’ [-Wformat=] printf("%lf\n", Q.top()); ^ user.cpp:27:9: warning: unused variable ‘t’ [-Wunused-variable] int t = V.size(); ^ user.cpp:16:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dstar.in", "r", stdin); ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dstar.out", "w", stdout); ^ user.cpp:18:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n ,&k); ^