Compilare: main.cpp:14:22: warning: overflow in implicit constant conversion [-Woverflow] const int INF = (1LL << 60); ~~~~~^~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:30:29: 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); ^