Compilare: main.cpp: In function 'int main()': main.cpp:118:16: warning: variable 'top' set but not used [-Wunused-but-set-variable] ajutorpq top = pq.top(); ^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:16:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^