Compilare: main.cpp: In function 'std::vector<int> rank_cats(std::vector<int>, std::vector<int>, std::vector<int>)': main.cpp:20:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( ans.size()+sfarsit.size() < N ) ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:295:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ( rez.size() <N ) ~~~~~~~~~~~^~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:109:41: 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 ); ^