Compilare: main.cpp: In function 'int main()': main.cpp:133:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos < buckets[i].size() && j == qry[buckets[i][pos]].dr){ ~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:124:13: warning: unused variable 'st' [-Wunused-variable] int st = (i-1)*lg + 1, dr = min (i*lg,n); ^~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:15:29: 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); ^