Compilare: main.cpp: In function 'long long int solve(long long int)': main.cpp:247:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ap.size()>l) ~~~~~~~~~^~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:28:29: 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); ^