Compilare: user.cpp: In function ‘void BF(int, int, int)’: user.cpp:31:43: warning: right operand of comma operator has no effect [-Wunused-value] node = my_queue.front(), next_node; int cost, d; ^ user.cpp:23:67: warning: unused variable ‘cost’ [-Wunused-variable] memset( D[k], INF, sizeof(D[k]) ); qnode node, next_node; int cost; ^ user.cpp: In member function ‘void input_reader::advance()’: user.cpp:80:53: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, SIZE, 1, input_file ); ^ user.cpp: In constructor ‘input_reader::input_reader(const char*, const char*)’: user.cpp:92:49: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread( buffer, SIZE, 1, input_file ); ^